Post on 13-Apr-2018
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You may call me
Dr. Vohra
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Elbow Radioulnar & Wrist Joints
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Bones involved are
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Elbow Joint
TypeHinge type of synovial oint!rticulationB"# the trochlea $ capitulum of humerus
$ trochlear notch of ulna $ head of the radius
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%ibrous &apsuleThe fibrous capsule completely encloses the oint. 'ts anterior and posterior
parts are thin and wea() but collateral ligaments strengthen its sides.
The fibrous capsule is attached to the pro*imal margins of the coronoid
and radial fossae anteriorly) but not +uite to the superior limit of the
olecranon fossa posteriorly.
Distally the fibrous capsule is attached to the margins of the trochlear
notch) the anterior border of the coronoid process) and the annular
ligament.
,ynovial membrane-ines the internal surface of the fibrous capsule
-igaments-ateral ligamentedial ligament
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-ateral ligament /radial collateral0's triangular ligament) its ape* is attached pro*imally to the lateralepicondyle of the humerus and its base blends with the annular ligament of
the radius
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edial ligament /ulnar collateral0't is composed of anterior and posterior bands /parts0) which are connected
by a thinner) relatively wea( obli+ue band.
'ts ape* is attached to the medial epicondyle of the humerus.
The strong cord1li(e anterior part is attached to the tubercle on the coronoidprocess of the ulna and the wea(er fan1li(e posterior part is attached to the
medial edge of the olecranon.
The ulnar nervepasses posterior to the medial epicondyle and is closely
applied to the ulnar collateral ligament.
http://download.videohelp.com/vitualis/med/uppnn.htmhttp://download.videohelp.com/vitualis/med/uppnn.htm7/26/2019 12 Elbow Joint
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ovements $ muscles
of the Elbow oint
This oint can befle*ed or e*tended
%le*ion is produced by the
brachialisand brachioradialis
muscles) but the main fle*or is
the brachialis. #hen the
forearm is supinated) the
biceps brachii muscle also
fle*es this oint2 when it is
pronated) the pronator teresdoes.
The main e*tensor of the elbow
oint is the triceps brachii muscle.
3ravity and the anconeus muscleassist with this movement.
http://download.videohelp.com/vitualis/med/mmarm.htmhttp://download.videohelp.com/vitualis/med/mmarm.htm7/26/2019 12 Elbow Joint
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Blood supply of the Elbow oint
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4elations of the elbow ointAnteriorly: Brachialis) tendon of biceps) mediannerve $ brachial artery
Posteriorly: Triceps a small bursa
Medially: 5lnar nerve
Laterally: &ommon e*tensor tendon $ supinator
6erve supply
The oint is supplied by the branches of median)ulnar) musculocutaneous $ radial nerves
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&arrying angle of the Elbow oint
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4adioulnar
JointThe radius and ulnaarticulate with each other
at their pro*imal and
distal ends at synovial
oints) called the pro*imal
and distal radioulnar
oints. These articulations
are the pivot type of
synovial oint that
produces pronation and
supination.
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!rticulation
The radial head articulates with the radial notch of the ulna.The head of the radius is held in position by the strong annular
/annular0 ligament)
%ibrous &apsuleThe fibrous capsule enclosing the oint is continuous with the fibrouscapsule of the elbow oint
,ynovial membraneThe deep surface of the annular ligament is lined with synovial
membrane. &ontinues above with elbow oint
-igamentsThe annular ligament is attached to anterior $ posterior margins of
radial notch. 't is continuous with the capsule of the elbow oint. 't is
not attached to radius
7ro*imal radioulnar oint
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ovementspronation and supination of
the forearm
4elationsAnteriorly: ,upinator $ radial nerve
Posteriorly: ,upinator $ common e*tensor tendon
Medially: 5lnar nerve
Laterally: &ommon e*tensor tendon $ supinator
6erve supplyThe oint is supplied by the branches of median)
ulnar) musculocutaneous $ radial nerves
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Distal radioulnar ointType7ivot type of synovial oint
!rticulationHead of the ulna $ ulnar notch of radius
&apsuleThe capsule encloses the oint but deficient superiorly
-igaments#ea( anterior $ posterior ligaments strengthen the oint!rticular discTriangular fibrocartilaginous) separates the cavity of the distal radioulnaroint from the cavity of the wrist oint. 5nites the radius $ ulna
,ynovial membrane-ines the capsule
6erve supply!nterior interosseous $ deep branch of radial nerves
ovement,upination $ pronation
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Distal radioulnar oint
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Type't is a condyloid type of synovial oint
!rticulationdistal end of the radius and the articular disc above $ scaphoid) lunate $
tri+uetral bones below
&apsuleThe capsule encloses the oint $ is attached above to the distal ends
of radius $ ulna below to the pro*imal row of carpal bones
-igaments
!nterior $ posterior ligaments strengthen the capsule the medial isattached to the styloid process of ulna $ to the tri+uetral bone. The
lateral ligament is attached to the styloid process of radius $ to the
scaphoid bone
#rist oint /radiocarpal0
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,ynovial membrane-ines the capsule $ attached to the margins of the articular
surfaces. The oint cavity does not communicate with that of distal
radioulnar oint or with the oint cavities of intercarpal oints
6erve supply!nterior interosseous $ deep branch of radial nervesovementThe movements of adduction) abduction) fle*ion) e*tension and
circumduction are possible.
4otation of the wrist oint is impossible because the articular surfaces are
ellipsoid in shape2 however) pronation and supination of the hand
compensate for the absence of this movement
&ont.#rist oint /radiocarpal0
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Fractures of the wrist (e.g., Colles' fracture)
involving the distal end of the radius are the
most common type of fracture in personsover 50 years of age
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