Knee ligaments
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Transcript of Knee ligaments
By M. MounesOrthopedic Department Ain Shams University
It is loss of normal anatomical relationship of the knee component during the ROM.
In this session we In this session we will discuss :will discuss :
- Bony Anatomy - Knee Functional anatomy - Knee Blood and Nerve
Supply - Knee Kinematics
The knee is formed from three bones :
- Femur (Femoral
Condyle) - Tibia (Tibial Plateau) - Patella (Articular
surface)
Femoral Part :- Medial femoral condyle: * Taller than the lateral femoral
condyle * 25 degree convergent * It is longer by 1.7cm than the
lateral condyle in the outer circumference
* Asymmetry in length produces axial rotation of the tibia on the femur during flexion and extension
- Lateral Femoral condyle: AP diameter more than the medial
condyle 10 degree convergent
Tibial Part :
- The medial plateau is nearly flat or concave and has a larger surface area than the lateral plateau.
- The lateral plateau surface is slightly convex.
- Both plateaus have a 10-degree posterior inclination to the tibial shaft in the sagittal plane.
ConcaConcaveve
ConveConvexx
Tibial Part :
- Tibial spines (or tubercles) are bony elevations, function to stabilize the condyles from side-to-side motion.
- The interspinous area is
void of hyaline cartilage, as are the insertion sites for the meniscal horns and cruciates.
Patella:
• Largest sesamoid bone in the body (usually 3 - 5cm in length)
• Patella tendon to patella length usually ratio of 1:1 (+/- 20%)
• 10% of patients have complete supra-patella membranes and 75% will have at least one of the 3 plica's even if only as a remnant (supra-patella, medial patella or infra-patella)
• Ossification centre appears between 2 and 3 years of age but can be as late as 6 years
Patella:
It has 2 articular facets (Medial and lateral)But recently (7)According to the shape of the facet it is
classified to :
In this session we In this session we will discuss :will discuss :
- Bony Anatomy - Knee Functional anatomy - Knee Blood and Nerve
Supply - Knee Kinematics
Knee Stabilizers Knee Stabilizers are :are :
-Extra-articular Extra-articular StabilizersStabilizers
-Intra-articular Intra-articular StabilizersStabilizers
-Medial-Lateral-Postero-medial-Postero-lateral-Antero-medial-Antero-lateral-Arcuate complex
-Medial-Lateral-Postero-medial-Postero-lateral-Antero-medial-Antero-lateral-Arcuate complex -ACL-PCL-MFL-Menisci
-ACL-PCL-MFL-Menisci-Bone congruityBone congruity
-PropioceptionPropioception
It is formed from three It is formed from three layers (Warren Marshal):layers (Warren Marshal):
1- First Layer: Crural fascia investing sartorius & gastroc + Sartorius
2- Second layer : - Superficial MCL. - Posterior Oblique ligament - Semi-membranosus
3- Third Layer: - Deep MCL - Coronary ligament - Medial capsule
-Is the primary static restraint to valgus stress at full ext. and at 30 degree flexion.
Has two portions: * Superficial fibers (tibial collateral ligament) * Deep portion (medial capsular ligament)
-Both portions originate from the medial femoral epicondyle.
-The superficial MCL has two bundles : The anterior bundle vertically oriented fibers inserts just posterior to the insertion of the pes anserinus; The posterior bundle oblique fibers insert inferior to the tibial articular surface.
- The medial capsular ligament also has two bundles : The meniscofemoral The meniscotibial portions, which are attached to the medial meniscus through the coronary ligaments.
The five attachments of the semimembranosus muscle :
-Direct head to the postero medial part of proximal tibia (pars directa)-Deep head deep to MCL (Pars reflexa)-Posterior oblique ligament-Oplique poplitial ligament-Expansions covering the popliteus fascia and the leg fascia
The five attachments of the semimembranosus muscle :
-Direct head to the postero medial part of proximal tibia (pars directa)-Deep head deep to MCL (Pars reflexa)-Posterior oblique ligament-Oplique poplitial ligament-Expansions covering the popliteus fascia and the leg fascia
Long Medial collater
-POL Attaches to PHMM & femoral condyle.
-Recently it is believes to be attached to SM and considered as one of its attachement
-It restraints Anterior tibial translation and external rotation through its attachment to the PHMM and Semimembrenosus
-POL rupture with the ACL when tibial anterior dislocation together with meniscal tear.
-POL rupture with the ACL when tibia external rotation
-Due to its parallism to PCL it acts secondary restraint of PCL
It is formed of three It is formed of three layers :layers :
1- First layer : Biceps femoris Iliotibial band2- Second layer : Patellar retinaculum Patello femorla ligament3-Third layer :LCL Popliteus tendonPopliteofibular ligamentPopliteomeniscal fasicle Arcuate ligamentFabillofibular ligamentPosterior capsule
Arcuate Complex:1]LCL2]. Arcuate lig (Y shaped condensation)3]. Popliteus tendon4]. Biceps tendon5]. Lateral head gastroc
Arcuate Complex:1]LCL2]. Arcuate lig (Y shaped condensation)3]. Popliteus tendon4]. Biceps tendon5]. Lateral head gastroc
PoplitePopliteus us CompleComplexx
1st Layer Ilial Tibial Tract
Bicep Femoris Peroneal Nerve
Exposing Layer 3
LCL
LCL
Deep Lamina of Layer 3
LCL
PF lig.
PF lig.
2° varus stabilizer Superficial Deep
(Kaplan’s fibers) Capsuloosseous
(anterolateral sling)
1° varus stabilizer Proximal / posterior
to lateral epicondyle Midway along fibular
head Surrounded by the
insertion of the Biceps muscle.
Stabilizer to posterolateral rotation1- Popliteus femoral
attachement
2- Popliteomeniscal fascicles
3- Popliteofibular ligament
4- Popliteal aponeurosis to lateral meniscus
Popliteofibular
Ligament
FabellofibularLigament
PopliteusMuscle
BicepsTendon
Popliteus attachment on Femur 2 cm from FCL Attaches on anterior fifth
of popliteal sulcus
Active internal rotator (unlocking)
Active antivarus joint coaptatorPassive control of external
rotationPassive control of
hyperextension
Originates at musculotendinous junction
Anterior / Posterior divisions
Static stabilizer of ER “Arcuate ligament” in old
literature
Fig. 8: Popliteofibular ligament, internal-external rotation (Karin Ullrich)
PT
PT
PFL
PFL
PM
PM
LM
LCLLCL
Internal rotation tibia:lax
External rotation tibia:tense
LM
It is formed from :-Anteromedial capsule- Medial retinacula-Patelofemoral and patelotibial ligament
It is formed from :-Anterolateral capsule- lateral retinacula-Iliotibial band
Knee Stabilizers Knee Stabilizers are :are :
-Extra-articular Extra-articular StabilizersStabilizers
-Intra-articular Intra-articular StabilizersStabilizers
-Medial-Lateral-Postero-medial-Postero-lateral-Antero-medial-Antero-lateral-Arcuate complex
-Medial-Lateral-Postero-medial-Postero-lateral-Antero-medial-Antero-lateral-Arcuate complex -ACL-PCL-MFL-Menisci
-ACL-PCL-MFL-Menisci
-Bone congruityBone congruity
-PropioceptionPropioception
Anatomy :Anatomy :Tibial origin : area approximately 11 mm X 17 mm located in front of, and lateralto, the medial intercondylar tubercleFemoral insertion :posterior part of the inner surface of the lateral femoral condyle
DimensioDimensions :ns :11 X33 mmThe ultimate load for the young ACL was 1,725 ±
269 N. Since that study, the criteria for the strength of autograft, allograft, and synthetic substitutes have been set at 1,730 N.
The ultimate load for the young ACL was 1,725 ± 269 N. Since that study, the criteria for the strength of autograft, allograft, and synthetic substitutes have been set at 1,730 N.
fUNCTIONS:fUNCTIONS:- Primary restrain to the anterior tibial displacement- Primary restrain for knee internal rotation- Secondary restrain to valgus and varus angulation at full extension-Propioception to the knee position -Screw home motion occurs around its axis
Direction of fibers :Direction of fibers :Anteromedial taut in flexion Posterolateral taut in extension
Named According to their insertion in the tibia
The secondary restrains to the anterior tibial drawer are :Medial meniscusCollateral ligamentsJoint capsule
AM taught in FlexionAM taught in Flexion
AM taught in ExtensionAM taught in Extension
Anatomy :Anatomy :Tibial origin :Femoral insertion :
DimensioDimensions :ns : The PCL averages in length between
32 and 38mm and has a cross sectional area of 31.2mm2 at its mid-substance level, which is 1.5 times that of the anterior cruciate ligament (ACL) cross-sectional area.Named according to Femur
Direction of fibers :Direction of fibers : The PCL consists of two functional components referred to as the anterolateral (AL) and the posteromedial (PM) bundles
It is the primary restraint to posterior tibial translation This is maintained throughout range of motion as the Anterolateral bundle is taught in flexion while the Posteromedial bundle is taught in extension.
fUNCTIONS:fUNCTIONS:
oPrimary restraint to posterior tibial translation oSecondary restraint to varus and valgus forces.o Secondary restraint to torsional forces.o Interacts with the ACL to form “Four bar cruciate linkage system”.oPropioception
They are :They are :
Ligament of HumpheryLigament of Humphery
Ligament of WrisborgLigament of Wrisborg
The ligament of The ligament of Humphry is anterior to Humphry is anterior to the PCL while the the PCL while the ligament of Wrisborg is ligament of Wrisborg is posterior to it.posterior to it.
Both arises from Both arises from the posterior horn the posterior horn of lateral meniscus of lateral meniscus and attached and attached anterior and anterior and posterior to the PCL posterior to the PCL attachment attachment simultaneously.simultaneously.
Ligament of Humphery
Ligament of Wrisborg
Anterior meniscofemoral ligament
Posterior meniscofemoral ligament
PCL
PCL
Elasto fibrocartilaginous Crescent shaped Medial meniscus is a small segment of a
wide circle while lat. meniscus is a large segment of a smaller circle
Ant. horns attached by a intermeniscal ligament
F is the highest vascular while A is the least vascular.
1 is the highest vascular while 3 is the least vascular
Popleteus muscle is attached to lateral meniscus
Semimemb. Is attached to medial meniscus Through the POL attachemetn to PHMM
Anterior horn of lat meniscus and post horn of both menisci attached to intercondylar eminence
Blood supply
From branches from lat,middle and medial genicular arteries
Vascular synovial tissue from the capsule supplies the peripheral third of the meniscus
Circumferential and radial collagen fibre type I in 98%
Matrix: Proteoglycans glycoproteins and elastins
Load bearing
At least 50% of the compressive load of the knee joint is transmitted through the meniscus in extension , and approx 85% of the load is transmitted in 90° flexion.Medial meniscus 85% LMM 75 %
Total meniscectomy can cause a fourfold increase in articular surface stresses.
Partial meniscectomy increases forces by 50%.
When compressive force is applied to the knee joint, the anterior and posterior attachments of the meniscus resist extrusion . This converts compressive force into hoop stress, which the circumferential orientation of the collagen fibers is ideally suited to withstand.
Load bearingThe shock absorbing capacity of normal knees is ~ 20% higher than in meniscectomised knees.
The ability of a system to absorb shock has been implicated in development of OA
It has a door stopper effect preventing anterior translation of the tibia
This has been inferred from the finding of type 1 and type 2 nerve endings in the ant and post horns of the menisci
• Secondary stabilizer• Proprioception• Joint lubrication
• Shock absorption
• Joint nourishment
The knee joint is a modified hinge synovial joint.
It is a combination of complex motion between rolling and gliding, ginglymus (hinge) and trochoid (pivot).
Hence comes the recent name (bicondyloid joint)
Six degrees of freedom are described to show the relationship of the tibia and the femur to each other.
These are broadly divided into:-Rotational - Translational.
The 3 rotational degrees of freedom are :1- Flexion-extension2- Internal-external axial tibial rotation3- Varus valgus (adduction-abduction).
The 3 translational degrees of freedom are: 1- Anterior-posterior tibial displacement2- Medial-lateral tibial displacement3- Proximal-distal (joint distraction-compression).
Constraints to excessive degrees of motion in these freedoms are provided by ligamentous structures around the knee.
How does the knee move ?
Differs from
How can the knee move ?
It is does not Roll
It is does not Glide
ROLLS
GLIDES
KINEMATIC THEORIES
1) Rolling Back of the femur
3) Helical axis
4) Envelope of motion
5) Rotation with medial pivot
2) Four-bar kinematic chain
6) Screw Home motion
MED LAT
Roll-back of femoral condyles
1) Rolling Back of the femur
Strasser, Lehrbuch der muskel, 1917
Four-bar chain is not rigid(PCL is lax in early flexion)
Zuppinger, Die active flexion, 1904
Four-bar chain is rigid
“Interactive knee”
2) Four-bar kinematic chain
(A) Model of the knee joint in full extension. (B) The interaction between these four bars can be used to describe theposterior migration of the tibiofemoral contact point that occurs with knee flexion. (C) Model of the knee joint in flexion.
Roll-back & Four-bar
Axis of motion passes through
the intersection of the bars
At the beginning the ratio of femoral to tibial motion is 2:1
At the end the ratio of femoral to tibial motion is 4:1
The angle of fixation of the four bar cruciate linkage system denotes the range of flexion and extension
If axis of fixation (blumenstate line) to the femoral axis is 90
degree
Hyp
er
exte
nsio
n b
y
50
deg
rees
If axis of fixation (blumenstate line) to the femoral axis is 40
degree
Norm
al R
an
ge O
f m
oti
on
Burmester Curve
A third order curve defined by the four bar cross linkage system defines the position for most isometric ligaments.
Burmester Curve
i.e. Points which make the external ligaments taught during flexion and extension thus maintaining its isometericity.
Fem
ora
l r
ota
tion
Exte
rnal
Inte
ern
al
0
Knee flexion – Squatting (degrees)
15012510075502525
20
15
10
5
0
5
103) Rotation with medial pivot
MFCMFC
Does not move AP Does not move AP
LFC
Moves backward 19 mm
Freeman, JBJS-B, 2000
DEEP FLEXION
MEDIAL LATERAL
AND NO ROTATIONAL AND NO ROTATIONAL MOVEMENT OF THE MOVEMENT OF THE
MFCMFC ? ?
“Mobility” of the LATERAL femoral condyle is due to:
1) High mobility of lateral meniscus
2) Lateral tibial plateu
convex and downsloped
“Stability” of the MEDIAL femoral condyle is due to:
1) Restraint of the fixed posterior horn of medial meniscus
2) Medial tibial plateu
cup-shaped & “upsloped”
(5°)
MFCLFC
MCLPCL
3) Ligament colums in constant tension on MFC
Flexion & rotation are combined resulting in an oblique axis.
FLEX ROT COMBINED
4) Helical axis
Obliquity and posterior shift produce an helical
axis.
1
234576
M L
Within the envelope the knee is “free” (2 D.O.F.), but towards its limits the joint is restrainedwith rotations coupled to F/E (1 D.O.F.)
5) Envelope of motion
0 20 40 60 80 100
0
1
2 SWING PHASE
STANCE PHASEFe
mora
l tr
an
slati
on
Post
eri
or
Ante
rior
Knee flexion – Stair climbing (degrees)
Hams pull tibia back(rollforward)
PCL restrains hams(rollback with flexion)
• It is the lateral rotation of the medial tibial plateau on femur during stance phase (extension), and internal rotation during swing phase (flexion).
• 3 factors leads to this mechanism:
1]. The more distal alignment of the MFC2]. The bigger radius of curvature of the MFC3]. The cruciates crossing in-between; around which this rotation occur
• Its significance it that it tightens both cruciates and locks the knee in the position of maximal stability
6) Screw Home motion
Valgus + External Rotation is the commonest medial side injury, respectively;1]. MCL then Medial capsule2]. ACL3]. MM = “O'DONOGHUE UNHAPPY TRIAD”
Valgus + External Rotation is the commonest medial side injury, respectively;1]. MCL then Medial capsule2]. ACL3]. MM = “O'DONOGHUE UNHAPPY TRIAD”
Varus + Internal injury of lat ligaments of the knee;1]. LCL then lateral capsule2]. ACL3]. Arcuate complex4]. Popliteus tendon5]. ITB6]. Biceps femoris7]. Common peroneal nerve,
Varus + Internal injury of lat ligaments of the knee;1]. LCL then lateral capsule2]. ACL3]. Arcuate complex4]. Popliteus tendon5]. ITB6]. Biceps femoris7]. Common peroneal nerve,
HYPEREXTENSION mechanism:1]. ACL2]. PCL & posterior capsule
HYPEREXTENSION mechanism:1]. ACL2]. PCL & posterior capsule
• ANTERO-POSTERIOR DISPLACEMENT: e.g. dashboard accident:1]. ACL or2]. PCL
• ANTERO-POSTERIOR DISPLACEMENT: e.g. dashboard accident:1]. ACL or2]. PCL
A knee dislocation is an injury that involves the anterior curciate ligaments and the posterior curciate ligaments usually in combination with the medial collateral ligaments or the lateral collateral ligaments and associated soft tissue structures.
Recently knee dislocation can occur with one curciate in association with collaterals
MEDIAL DISLOCATION LATERAL DISLOCATION
ANTERIOR DISLOCATION POSTERIOR DISLOCATION
KD I : One of the cruciates + one of the collaterals
KDII: Both cruciates
KDIIIL : Both cruciates + LCL but MCL is Intact
KDIIIM: Both cruciates + MCL but LCL is intact
KDVI: Both cruciates + MCL + LCL
KDV: Fracture Dislocation knee
Knee fracture-dislocation (Fx-Dx)KDV.1 Fx-Dx ACL or PCL intactKDV.2 Fx-Dx with a bicruciate injuryKDV.3 Fx-Dx, bicruciate injury, one cornerKDV.4 Fx-Dx, all four ligaments injured+ N = Nerve injury+ C = Vascular injury
Knee fracture-dislocation (Fx-Dx)KDV.1 Fx-Dx ACL or PCL intactKDV.2 Fx-Dx with a bicruciate injuryKDV.3 Fx-Dx, bicruciate injury, one cornerKDV.4 Fx-Dx, all four ligaments injured+ N = Nerve injury+ C = Vascular injury
History:1- Ask about the traumatic knee event :
•Clear pop + Non contact trauma : - ACL - Patellar Dislocation •Clear pop + contact trauma: - Collateral - Fracture - Meniscal•No clear ‘pop’ PCL
2- Ask about the ability to continue walking :• If the pt. can continue Meniscal injury / PCL•If pt. can not Other ligamentous injury
3-Ask about Knee Swelling :• If immediate swelling Ligamentous injury Fracture•If late swelling meniscal injury
4-Locking:• Meniscal injury (Bucket hundle)•Lose body
5-Pseudo Locking:• Hamstring spasm•Hge + PF disorder
7- Pseudo giving way:• Reflex inhibition of muscles due to ant. Knee pain
6- Giving way:• Ligamentous injury•Patellar dislocation
Inspection & palpation :- Knee swelling, bruising.- Varus or valgus malalignment- ROM- Gait abnormality
- Ballottement test
-Wave test
- Quadriceps wasting and decrease in thigh girth
MCL and LCL:
leg under arm, 2 hands, 30º flexion to relax pos capsule (careful not to rotate knee)
• Valgus stress in flexion ........... MCL
• Valgus stress in extension …... MCL + POL
• Varus stress (taut in full ext) .... LCL (normally lax in flexion)
Grade 1 •Mild tendernes over the ligament. •Usually no swelling. •When the knee is bent to 30 degrees and force applied to the inside of the knee pain is felt but there is no joint laxity.
Grade 2•Significant tenderness on the lateral lig. •Some swelling seen over the ligament. •When the knee is stressed as for grade 1 symptoms,there is pain and laxity in the joint, although there is a definite end point.
Grade 3•This is a complete tear of the ligament. •When stressing the knee there is significant joint laxity. •The athlete may complain of having a very unstable knee.
ACL:
-Knee flexed at 90° -Anterior pull of the tibia.
Anterior drawer Anterior drawer test :test :Anterior drawer Anterior drawer test :test :
- At 15-30º (put patient's knee over your knee) - most sensitive
Lachman test :Lachman test :Lachman test :Lachman test :
Laxity test
Functional tests
KT 1000 and KT 2000KT 1000 and KT 2000
1- Mcintosh 1- Mcintosh testtest1- Mcintosh 1- Mcintosh testtest
Pivot Shift Pivot Shift Tests:Tests:Pivot Shift Pivot Shift Tests:Tests:
2- Lose test2- Lose test2- Lose test2- Lose test
Knee extended, valgus strain, foot internally rotated, if instability present, tibia is subluxed anteriorly. Now flex knee, clunk at 30º is +veNormal MCLand iliotibial band and torn ACL
knee & hip flexed 45º and the other hand thumb behind the fibula. ER and valgus the tibia + slow extension + push the fibula forward tibial condyle shifts or subluxes forwards in full extension.
Pivot Shift Pivot Shift Tests:Tests:Pivot Shift Pivot Shift Tests:Tests:
4- Anterior jerk off 4- Anterior jerk off testtest4- Anterior jerk off 4- Anterior jerk off testtest
3- Slocum 3- Slocum testtest3- Slocum 3- Slocum testtest
Patient lies on unaffected side, with unstable knee up & flexed 10º.Medial aspect of foot rests on table. Patient maintains ipsilateral pelvis rotated posteriorly30-50º. Knee pushed into flexion. Easier to do in heavy or tense patients.
This is considered the reverse of the classic pivot shift test as it starts from flexion to extension.
1- Ducking 1- Ducking testtest1- Ducking 1- Ducking testtest
2- Acceleration deceleration test 2- Acceleration deceleration test (Gallop Test)(Gallop Test)2- Acceleration deceleration test 2- Acceleration deceleration test (Gallop Test)(Gallop Test)
3- Single leg 3- Single leg jump testjump test3- Single leg 3- Single leg jump testjump test
PCL and PLC :
Step Off testStep Off testPosterior drawer testPosterior drawer test
External rotation recurvatum testExternal rotation recurvatum test
Dial testDial test
Postero lateral drawer testPostero lateral drawer test
Whipple Ellis testWhipple Ellis test
Quadriceps Active testQuadriceps Active test
Reversed pivot shift testReversed pivot shift test
PLC PLC TESTES
TT
PLC PLC TESTES
TT
Step off test :
- Knee flexed at 90° -The medial tibial plateau normally lies approximately 1 cm anterior to the medial femoral condyle.
-This step-off, is usually reduced in the PCL-deficient knee
- It can easily be felt by running the thumb down the medial femoral condyle toward the tibia.
Posterior drawer test :
The posterior drawer was the most sensitive test (90%) and highly specific (99%).
-The patient supine, with the hip flexed to 45°, the knee flexed to 90°, and the foot in neutral position.
- A posterior- directed force is applied to the tibia, assessing the position of the medial tibial plateau relative to the medial femoral condyle.
Posterior drawer test :The posterior translation is graded according to the amount of posterior subluxation of the tibia (Noyes grading):
1-Grade I : Tibial translation between 1 and 5mm. 2-Grade II : Posterior tibial translation is between 5 and 10 mm, and the tibia is flush with the femoral condyles. 3-Grade III : This is seen when the tibia translates greater than 10 mm posterior to the femoral condyles.
Because it is important to accurately measure the posterior translation of the tibia to select a proper treatment, instrumental devices such as the KT-1000 (MedMetric) has been developed as adjuvant tool.
- Patient supine position.- Suspending the lower extremity in the extension while grasping the great toe.
The sensitivity of this test, as reported in the literature, ranges from 33% to 94%.
External Rotation Recurvatum Test :
Dial Test :
- The patient positioned prone or supine. - An external rotation force is applied to both feet with the knee positioned at 30° and then 90° of flexion.
-When compared with the uninjured side, an increase of 10° or more of external rotation at 30° of knee flexion, is suggestive of an isolated PLC injury.
- Increased external rotation at both 30° and 90° of knee flexion suggests a combined PCL and PLC injury .
Quadriceps active Test :- The patient supine and the knee flexed to 90°.
- The examiner stabilizes the foot, and the patient is asked to slide the foot down the table.
-Contraction of the quadriceps muscle results in an anterior shift to the tibia in the PCL-deficient knee. A shift greater than 2 mm is considered positive for PCL insufficiency.
Whipple and Ellis Test :
-The patient prone and the knee flexed at approximately 70°.
- Grasping the lower leg with one hand and posteriorly displacing the tibia by the other.
- This test avoids quadriceps contraction, Moreover, if there is an associate damage of posterior capsular structures, the foot moves during this test medially or laterally
Reverse Pivot Shift Test :
- The patient is supine and the knee is held, initially, in 90° of flexion.
- The examiner externally rotates and extends the knee.
- When positive, an anterior shift of the tibia will occur at approximately 20° to 30° of flexion. It usually signifies injury to the PLC mainly in addition to PCL injury.
Meniscal tests :Meniscal tests :1- Mcmurray test1- Mcmurray test2- Appley compression 2- Appley compression testtest3-Jerk test3-Jerk test4-Steinmen test.4-Steinmen test.MOST IMPORTANT MOST IMPORTANT TENDER JOINT LINETENDER JOINT LINE
Mcmurray test:
Appley compression distraction test:
I- Anteroposterior and Lateral views :
To evaluate for fractures and/or dislocation.
I- Anteroposterior and Lateral views :
Mediolateral displacement
Segond`s Fracture
I- Anteroposterior and Lateral views :
Avulsion of tibial spine indicating ACL avulsion
II- Axial radiography :
- Knee flexed 70 and X ray beam angled superiorly.
-The location of the tibia in relation to the femur as compared with the contralateral normal side.
-An axial press 18kg may be used to produce maximum posterior translation.
III- Stress Radiography :
-Divided according to the type of the force applied to : A) Manual Force Technique :
- Produced by examiner or weight loading 200-300 N (25-30 Kg). - Another method based on hamstring contraction.
B) Instrumented Technique :
Due to lack of standardized applied force, errors in knee flexion angle and tibial rotation, an instrumental applied stress force is produced.
One of the most commonly used is Telos device.
IV- The kneeling view (Barlet view ):
- The patient in the kneeling position applies a direct force which subluxes the tibia posteriorly. be calculated.
Normal ACL , PCL and Menisci on MRI presents
T1
T2
MRI was found to be 99% accurate and sensitive diagnosing the presence of ACL and PCL injury.
Primary Signs:
1- Change of signal2- Change of contour
Loss of Loss of continuity in continuity in three three successive successive cutscuts
Secondary Signs:
1- Change of signal2- Change of contour3- Buckling of 3- Buckling of ACL and ACL and posterior PCL posterior PCL line does not line does not intersect the intersect the posterior posterior femoral line.femoral line.
4- Posterior border of the lateral plateua in the most lateral cut is translated anterior to the LFC
MRI classification was first published by Gross et al.
Grade I : Intraligamentous lesion : High signal intensity within the ligament.
Grade II : Partial lesion: High intensity signal on the dorsal edge of the ligament. (Anatomical site of the posteromedial fascicle)
Grade III: Partial lesion : High signal intensity on the ventral edge of the ligament. (The anatomical site of the anterolateral fascicle.)
Grade IV: Complete lesion : No remaining fibres are detected. AL and PM fascicles at the site of injury show high signal intensity and are scarcely detectable.
Stallar Classification
Stallar Classification
Example of GIII tearExample of GIII tear
Discoid MeniscusDiscoid Meniscus
Bucket Handle Tear:
-Part of the meniscus in the intercondyler notch-Vertical cut in the coronal section-Double PCL sign in both Coronal and Sagital
Bucket Handle Tear:
-Part of the meniscus in the intercondyler notch-Vertical cut in the coronal section-Double PCL sign in both Coronal and Sagital
Osteochondral Lesion + MCLOsteochondral Lesion + MCL
The role of diagnostic arthroscopy The role of diagnostic arthroscopy is debatable as history taking, is debatable as history taking, clinical examination and MRI are clinical examination and MRI are sufficient for diagnosis.sufficient for diagnosis.
But other surgeons state that But other surgeons state that arthroscopy can provide further arthroscopy can provide further information which is useful.information which is useful.
Arthroscopy is done 2 to 3 weeks Arthroscopy is done 2 to 3 weeks after injury.after injury.
ISOLATED ACL ISOLATED PCL:
The PCL has high potential for spontaneus healing
If avulsion ORIF It depends on the grade: - GI and II
conservative treatement - GIII usually
accompanied with PLC so usually needs rsurgical interference for acut PLC repair then three weeks later PCL reconstruction
ACL has no potentional for spontaneus healing
If tibial avulsion ORIF
If midsubstance tear we should do ACL reconstruction
Preopertive physiotherapy phase I for three wks then ACL reconstruction
ISOLATED MCL: ISOLATED LCL :
1. MCL has a potentional healing as it is broad
2. According to the grade:
- GI and GII usually conservative using hinged knee brace and physiotherapy
- GIII needs open repair if early or reconstruction if late.
LCL has no potential for healing as it is cord like.
If grade I usually conservative
Grade II and III treated usually be LCL reconstruction
ACL+ COLLATERAL(S) TORN
PCL+ COLLATERAL(S) TORN
1. Collateral ligament heal.
2. Early ROM.3. Delayed ACL
reconstruction.4. If PLC injuried this
require early operative repair or reconstruction.
Treatment should be directed 1st to pcl
ACL+PCL1.rare2.good outcome3.Intact collateral make treatment
simplified.4.Early repair of PCL after ROM then
delayed ACL reconstruction or bicurciate reconstruction simultaneously.
PLC injuries
acute chronic
Isolated(rare)
Combined with cruciate injury
Combined with cruciate injury
Isolated(rare)
repair PLC repair +/- augmentation
Cruciate reconstruction
PLC reconstruction
PLC reconstruction
Cruciate reconstruction++
osteotomy if varus malignment
+
The Graft of choice should be :- Strong.- Should provide secure fixation.- Should be easy to pass.- Should be readily available.- Should have low donor site morbidity.
I- Graft Choice:
Types of grafts:1- Autograft:
Quadriceps tendon autograft : - It is self available- Having a suitable size- Has approximately three times the cross-sectional area of the patellar tendon.- Long enough.- Leaves no anterior knee pain at the graft harvest site.
That makes it an acceptable graft choice for PCL reconstruction specially double bundle technique and inlay method .
Patellar tendon autografts Causes anterior knee pain.
Hamstrings facilitate the arthroscopic method and can be split into two sets for the double-bundle technique.
2- Allograft :
Achilis tendon allograft graft is recommended :- The osseous portion of the graft- Has high tensile strength.- Size and length for easily splitting in -double bundle reconstruction.
3- Synthetic graft
4- Allograft with Synthetic graft augmentation.
Synthetic graft augmentation
30°, 70°, 4.5 mm telescope
Pump Shaver Fluoroscopy for driling the tibial tunnel Specific PCL tools
Equipments :
Distal fixation: post, endobutton, fliptag.
Aperture fixation: interf. screws & wedges.
II- Fixation Sites:
Advantages: Provides rigid fixation.Improves stability & isometry.
Decreases working length of the graft leading to less creep & relaxation.
Avoids graft tunnel motion
Early bone intergration and hence early walking .
Disadvantages:Potential risk of graft laceration or fracture.
Provides less stiffness. Windshield wipering
effect (A/P). Bungee cord effect
(sup/inf). May cause delayed
incorporation & tunnel dilatation leading to increased laxity.
The strength & quality of fixation may be improved by filling the canal or by hybrid fixation.
Aperture Aperture fixationfixation
Distal fixationDistal fixation
III- Fixation devices:
- Screw (biodegradable or Titanium- Endbutton or fliptag- Tranfix or RigidFix
- Staples
ACL Transtibial Method (Arthroscopic)
ACL Reconstruction
Steps:
-Graft Harvesting- Graft Preparation
-Notch Debridement- Tibial Tunnel
-Femoral Tunnel
Notch Debridement
Tibial Footprint
Tibial FootprintIn the center of ACL tibial
insertion
Tibial Tunnel
Femoral FootprintFemoral Footprint
For decades, the conventional transtibial technique has
been regarded as the gold standard for ACL reconstruction.
Femoral Tunnel
Femoral FootprintFemoral Footprint
Transtibial tunnel always guide the Femoral Tunnel to vertical non anatomical OVER THE TOP position.
Femoral FootprintFemoral Footprint
Femoral FootprintFemoral Footprint
A nonanatomically positioned femoral tunnel is one of the most common causes of clinical failure
after ACL reconstruction, with 15% to 31% of athletes
complaining of pain, persistent instability, or an inability to return
to the previous level of competition
1- PORTALS
2- Femoral Footprint
2- Femoral Footprint
2- Femoral Footprint
2- Femoral Footprint
Double Bundle ACL
Double Bundle Femoral Tunnels
Double Bundle Femoral Tunnels
Double Bundle Femoral Tunnels
Double Bundle Femoral Tunnels
Double Bundle Tibial Tunnels
Double Bundle Tibial Tunnels
Double Bundle Tibial Tunnels
Double Bundle Tibial Tunnels
Is there any benefit from
Double Bundle ACL
reconstruction ?
ACL With Navigation
System
Treatment Treatment of PCLof PCL
Indicatioins : 1- Partial rupture of the PCL 2- Less than 10mm of posterior tibial
displacement (i.e. Grade I, II) 3- Elongation of the PCL
Physiotherapy is very essential Physiotherapy is very essential for conservative treatment for conservative treatment including three phases .including three phases .
Objects of applying physical therapy for patients with PCL :
-Reduce swelling and knee pain
- Strengthen the quadriceps muscle.
-To stimulate the propioceptive sense.
-Sustain the elasticity of muscles around the knee.
-Let the patient know their condition so that they can adapt daily life.
The Following Physiotherapy Can be Applied For PCL and ACL
but with difference of the mode either accelerated (3months) or normal rehabilitation (6 months)
-Knee braces applied to all patinets and locked between 0 to 60 degrees.
-Weight bearing is allowed only partially up to 50% of body weight.
Stretching program for thigh and leg muscles.
- Propioceptive training is applied at the late 4th week of the injury.
- Quadriceps muscles to be strengthened with increasing loads.
- Co-contraction of quadricpes and hamstrings muscles (Closed kinetic chain exercise).
- Propiocetpive exercise continue.- Normal gait with full weight bearing to be allowed.
- Knee brace is still used to support the knee during light activities in the early phase II.
- Jogging straight forward, side by side, and backward direction.
- Performing advanced propioceptive training.
- Return to sport activity.
Indications for operative treatment are :
I- Avulsion PCL injuries either femoral of tibial avulsionsII- Grade III PCL injuries with significant instabilily: Due to the probability of occult PLC injury.III- Combined injuries : PCL+ ACL, PCL+ PLC, PCL+MCL
IV- Failure of conservative treatment.
Reduction and fixation of the avulsed fragment via either :
- Open technique - Arthroscopic technique
The choice of the fixation device depends mainly on the size of the avulsed fragment:
- Large (more than 20mm) cannulated screw
- Meddium sized (10 to 20mm) K wires
- Small sized (less than 10mm) wire sutures
I- Posteromedial approach :
II- Direct posterior approach :
Biceps Femoris
Small Saphenous vein
Common peroneal nerve
Lateral head Gastrocnemeus
Tibial nerve
Medial Head gastrocnemeus
Semimembronuses
Post. Joint Capsule
Sandra et al. 2007 have described an arthroscopic method PCL avulsion repair:
- Posterior triangulation for adequate visualisation for the avulsed PCL fragment.- Classic anteromedial and amterolateral ports for reduction of the fragment using tibial guide.- Stabilization of the fragment by temporarily guide wire through the tibial guide forming tunnel A. (The wire has 2 holes in its distal end)- Another two tunnels B and C are formed in the PCL crater 2cm medial and lateral to the tunnel A.
- Steel sutures wires are passed through tunnel B, C ,then passed through the holes in the guidewire in tunnel A, then the guide wire is pulled.There is 4 ends for steel sutures wires free at the anterior tibial side to be tied firmly.
Portals :
-The standard anteromedial and anterolateral portals.
- In addition to posteromdial portal.
Debridement of PCL Remnants fibers :Meticulous debridement of the PCL insertion firbres by a shaver through the posteromedial portal.
Tibial tunnel:
- Tibial C guide used
- Entry point just distal and medial to tibial tubercle.
- The guide passes medial to the ACL to the posterior tibia.
- The vascular structures protected by the PCL Elevator.
Femoral tunnel:
-It is helpful to leave the PCL femoral insertion fibers intact to outline the PCL foot print.
- For the anterolateral bundle it present in the anterior half of the femoral PCL insertion 8 to 9 mm from the articular surface.
- In double bundle technique the posteromedial bundle lies posterior and proximal to it.
Femoral Tunnel tunnel:
- Femoral guide is used.
-The femoral tunnels are marked with cautery.
- Then probed.
- Then 2 guide wires are passed through them and overdrilled.
Passage of the graft :
Fixation of the graft :-Anterolateral bundle is fixed to the femrol in 90 degree
frlexion.-The posteromedial bundle is fixed in 20-30 degree flexion.
Single Bundle Double Bundle
Position of the patitent:
Incisions :
-Posterior approach.-Postrerior.
Preparation of the inlay graft:A unitcoritical window is fashioned to fit the dimensions of the bone block.
-The graft bone plug is fixed with 4.5 mm cannulated screws.-Then the femoral ends are passed through the femoral tunnels to be either Single bundle or Double bundle.
Fixation of the graft and femoral passage:
Harner, et al (2000)Harner, et al (2000)
- Showed in their cadaveric study that the use of double bundle technique reduced the posterior laxity by 3.5mm.
Bergfeld et al (2005) - No statistical differences between the single-
bundle and double-bundle reconstructions were found at any angle of flexion
Disadvantges of the transtibial method includes :
- Neurovascular injury.(The most seriuos)
- Patients frequently retain grade I or II laxity (Residual laxity)
- Graft failure due to killer turn.
Advantages of tibial inlay method:
- Imrpoved biomechanical stability by using larger graft.
- Less risk to neurovascular structures.
- Avoid the “Killer turn” in transtibial method
Disadvantages of the inlay method includes:
- Change the position of the patient intraoperatively.
- Opening of the posterior capsule.- Longer time of operation.- Making additional skin incision at the
popliteal fossa.
Bergfeld, et al. (2001)
-A study on 6 pairs of cadaveric knees, 6 inlay method and 6 transtibial method. -After cyclic loading, the transtibial technique grafts became compromised and failed, that is because" killer turn” that the graft makes at the mouth of the transtibial tunnel.
MacGilliravay, et al. (2006) -Transtibial tunnel technique with quadrupled hamstring autograft group on 21 knees was used and the tibial inlay technique with bone–patellar tendon–bone autograft on 22 knees. -The study identified no significant differences between the transtibial and tibial inlay techniques, and satisfactory clinical and stress radiologic results were obtained in both groups
A- Complications from trauma :
-Associated ligamentous injury
-Associated meniscal and chondral complications.
-Associated bone injury
-Fixed posterior subluxation (FPS): * It is a posterior displacement of the tibia more that or equal to 3mm on anterior stress radiograph. * Reduction of the FPS is essential before any surgical interference as it adds more stresses on the graft and leads to its failure.
- FPS can be treated by using a Posterior Tibial Support splint.- The splint is worn during the night for 6-8 weeks.
1- Neurovascular iatrogenic injury : (The most serious)-In transtibial tunnel during
reaming.-Methods to avoide:
I- Use of oscillating drill.
II- Use PCL elevator as a protector
II- Use of tapered instead of square drill.
III- Intraoperative image intensifier.
IV- Formation of posteromedial safety incision. (best method)
2- Residual laxity : (The Most common)
Methods to avoid:-The use of strong graft-Correct tunnel placement-Correct graft tensioning-Secure graft fixation.
3- Loss of knee ROM
4- Medial femoral condyle osteonecrosis
5- Residual laxity : (The Most common)
6- Graft failure:Technical considerations to avoid it:I- Smooth well chamfered tunnel edges.
II-Anatomic positioning of PCL reconstruction tunnels to avoid acute angles.
III-Secure fixation.
IV- Treatment of FPS before surgery.
V- Postoperative immobilization in full extension for 4-6 weeks.
7- Residual laxity : (The Most common)
-Persistent posterior sag.- Prominent hardware.-BTB patellar tendon graft.-Suprapatellar synovitis.
8- Intraoperative iatrogenic fracture.
1- Acute 1- Acute Repair Repair (Direct (Direct Repair)Repair)
1- Acute 1- Acute Repair Repair (Direct (Direct Repair)Repair)
Acute repair techniques of posterolateral corner (PLC) injuries. A, Injuries to the critical structures of the PLC. B, A sequential acute repair of the deep structures (popliteus complex, lateral collateral ligament, and capsule) and superficial structures (biceps and iliotibial band).
2- Chronic 2- Chronic PLCPLC
2- Chronic 2- Chronic PLCPLC
A- Non anatomic A- Non anatomic repair :repair :A- Non anatomic A- Non anatomic repair :repair :
A- Non anatomic A- Non anatomic repair :repair :A- Non anatomic A- Non anatomic repair :repair :
Primarily sling procedures Biceps Tenodesis (nonanatomic)
A- Non anatomic A- Non anatomic repair :repair :A- Non anatomic A- Non anatomic repair :repair :
Deficiency of LCL
reconstruction with
B-PT-B Deficiency of LCL figure of eight ST
Two tailed reconstruction of FCL / PFL and popliteus tendon
Biomechanically restores function of native ligaments
B- Anatomic repair B- Anatomic repair ::B- Anatomic repair B- Anatomic repair ::
Femoral tunnels (8 mm) Proximal 1/5 popliteus
sulcus (PLT) Proximoposterior to
lateral epicondyle (FCL) 7 mm interference
screws
Tibial tunnel (10 mm) AP from distomedial
Gerdy’s to popliteus musculotendinous junction
Fix with bioscrew/staple (60°, IR)
Warren method :
Is older method and resembles the previous anatomic mentioned technique
-Knee braces applied to all patinets and locked between 0 to 60 degrees.
-Weight bearing is allowed only partially up to 50% of body weight.
Stretching program for thigh and leg muscles.
- Propioceptive training is applied at the late 4th week of the injury.
- Quadriceps muscles to be strengthened with increasing loads.
- Co-contraction of quadricpes and hamstrings muscles (Closed kinetic chain exercise).
- Propiocetpive exercise continue.- Normal gait with full weight bearing to be allowed.
- Knee brace is still used to support the knee during light activities in the early phase II.
- Jogging straight forward, side by side, and backward direction.
- Performing advanced propioceptive training.
- Return to sport activity.
Zones of the Zones of the meniscusmeniscus
Long tears (more than 2.5 cm) heal poorly.• Tears that are known to cause locking or that
can be locked during surgery are known to have higher healing failure rates.
LengthLength
Pattern of Pattern of teartear•Vertical tears have better healing potential.
•Oblique & horizontal tears are less likely to heal.•Stable tears heal readily ( tears less than 1 cm, tears that can not be displaced more than 3 mm, and partial thickness tears.
•Non operative treatment :Non operative treatment : Indications :Indications :
•No history of locking, a block to extension,•No associated ACL injury•Partial-thickness tears•Incomplete radial tearsStable vertical longitudinal tears displacement less than 3mm and the length less than 10 mm in length do not need resection
A- PARTIAL MENISCECTOMY•Most meniscal tears are treated by arthroscopic partial meniscectomy. •The goal of partial meniscectomy is to remove only the unstable or pathologic portion, leaving as much healthy meniscal tissue as possible while avoiding an abrupt transition to the remaining meniscus.
•Partial meniscectomy is indicated for: -Radial tears not extending to the periphery.-Oblique tears (flap or parrot beak) -Horizontal cleavage tears-Degenerative tears -Irreparable vertical longitudinal tears that are more than 5 mm from the absolute periphery. (i.e. in WW zone)
B- MENISCAL REPAIR :
Indications for Repair : Location : We repair all tears in the red zone and most in the gray zone Nonmacerated , nondeformed fragments in the gray zone only. Tear pattern : Repair is indicated for vertical longitudinal tears not Longer than 1 cm and for radial tears that extend into the red zone. Tissue quality : We do not repair macerated and degenerative menisci. AGE : We routinely perform meniscal repair in patients up to the age of 45 years.
Accepted techniques include :
• Open repair.
• Inside-out arthroscopic repair
• Outside-in arthroscopic repair
• All-inside repair.
ArrowsArrows
Fast FixFast Fix