Management of Osteoperotic Fractures Ashraf El-Nahal Apr[1].1.10
Transcript of Management of Osteoperotic Fractures Ashraf El-Nahal Apr[1].1.10
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Management of Osteoperotic Fractures
Prof. Dr. Ashraf El-NahalFaculty of Medicine, Cairo University
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THE PROBLEM
2 Months 6 Months
Fixation failure Malunion
F 81 yrs 3 MonthsF 83 yrs
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The Problem
Osteoporotic bone has no impairment for fracture healing.
Impaired function due to inferior surgery in the elderly is unacceptable.
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The Solution
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Surgical procedures aimed at increasing fixation stability
Should be considered when treating osteoporotic fractures
In joint reconstruction in severely osteoporotic bone (shown by pre-operative DXA)
FIXATION AUGMENTATION TECHNIQUES(FATs)
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Polymethylmethacrylate (PMMA: acrylic bone cement)
Bone grafts
Bone graft substitutes (calcium phosphate)
Joint replacement whenever feasable.
Intamedullary nailing is better than surface fixation
Modified implants
Pharmaceuticals
Combined FATs Moroni et al, Scand J Surg, 2007
Principles of FATs include:
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Autografts
Allografts
BONE GRAFTS
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Enhance osteogenic response Have osteoinductive and osteoconductive
potentialStructural support to maintain fracture
reductionGenerally harvested from patient’s iliac crestFinite quantity availableDonor-site morbidity
BONE GRAFTS AUTOGRAFTS
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No osteogenic potential
Mechanically improve fracture stability
No donor-site morbidity
Possible disease transmission
BONE GRAFTS ALLOGRAFTS
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BONE GRAFT SUBSTITUTESBONE GRAFT SUBSTITUTES
• Synthetic materials that possess
osteoconductive and structural properties
• Do not possess osteoinductive or osteogenic
potential
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BONE GRAFT SUBSTITUTESCALCIUM PHOSPHATES
• Calcium phosphates account for most ceramic-based
bone graft substitutes
• Close chemical and crystal resemblance to bone mineral
• Biocompatible
• Scaffolds that induce a biologic response similar to bone
• The most widely used form of calcium phosphate is
hydroxyapatite (HA)
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Better fixation No pin-tract infection
Level I Evidence (JBJS Classification)
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4 cut-outs in the standard lag
screws
No cut-out in HA-coated lag screws
Better clinical outcomes in HA-
coated groupSHS
Standard screws
SHS HA-coated screws
Level I Evidence (JBJS Classification)
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Joint Replacment whenever feasible:
Is a good option for osteoporotic patients with articular fractures where internal fixation is inappropriate.
Joint Replacment
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Intramedullary Nailing Is always better than surface fixation as
they are load sharing devices It can be used in subtrochanteric fracture of
the femur, and unstable fractures of the proximal humerus.
Unfortunataly the ideal fracture for intramedullary nailing that is short, oblique or transverse diaphiseal fractures are rare in the elderly patients
Intramedullary Nailing
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All available implants designed for fixation of normal bone
No implants specifically designed for fixation
of osteoporotic bone
Traditional implants do not perform optimally in osteoporotic
bone
MODIFIED IMPLANTS
WHY DO WE NEED MODIFIED IMPLANTS?
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Screw holding power increased using screws with:
Smaller pitch
Greater screw thread angle
Smaller core diameter
MODIFIED IMPLANTS CHANGES IN SCREW DESIGN
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Theoretical Advantages No focal necrosis of bone and soft
tissue deep to plate…improved local resistance to infection
Avoids early temporary bone losses under plate induced by vascular damage
Strength of fixation equals the sum of all the bolts (screws) ability to resist shear at the boltbone interface. Not that of a single screw’s thread purchase.
MODIFIED IMPLANTS Locking Screws
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zPHARMACEUTICALS
ALENDRONATE SYSTEMIC ADMINISTRATION
Conclusions “ Weekly post-op systemic administration of alendronate for 3 months improves pin fixation in cancellous bone in elderly female
patients with osteoporosis.”
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Implant Fixation Enhanced by Intermittent Treatment with Parathyroid Hormone
R.Skripitz, P. Aspenberg
From Lund University Hospital, Lund, Sweden
PHARMACEUTICALS PTH (1-34)
Conclusions “PTH increased the mean screw removal torquefrom 1.1 to 3.5 Ncm (p= 0.001)”
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COMBINED FATsLCP AUGMENTED WITH HA-COATED SCREWS
5-fold greater fixation Better gap healing
JOT, 2008
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Cements loaded with osteoinductive growth factors, cells and drugs
Coated fracture fixation implants loaded with osteoinductive growth factors, cells and drugs
COMBINED FATs
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