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Effect of interposition material on mechanical behavior in partial physeal resection: a canine model
M J Bueche1, W A Phillips, J Gordon
1Section of Orthopaedic Surgery, University of Michigan, Ann Arbor 48109.
Journal of Pediatric Orthopedics
|July 1, 1990
Summary
Using a canine model, researchers found that polymethylmethacrylate (PMMA) can moderate physeal displacement after partial resection. This load-sharing material is recommended for large physeal arrests to prevent growth disturbances.
Area of Science:
- Orthopedic surgery
- Biomechanical engineering
- Veterinary medicine
Background:
- Partial physeal resection can lead to growth disturbances.
- Understanding the mechanical consequences of physeal resection is crucial for surgical outcomes.
- The Heuter-Volkman law describes the relationship between physeal stress and growth.
Purpose of the Study:
- To investigate the mechanical properties of the partially resected physis in a canine model.
- To evaluate the role of load-sharing interposition material in mitigating adverse mechanical changes.
- To assess the efficacy of polymethylmethacrylate (PMMA) in the resection gap.
Main Methods:
- A canine model with ten puppy knees was utilized.
- Axial loading was applied to the knees, with strain gauges on the proximal tibial physis.
- Partial physeal resections were performed, followed by testing with and without PMMA interposition.
Main Results:
- Increasing areas of resection led to significant changes in physeal displacement.
- Polymethylmethacrylate (PMMA) interposition effectively moderated these changes in physeal displacement.
- The study demonstrated the mechanical impact of resection size on physeal behavior.
Conclusions:
- Load-sharing interposition materials, such as PMMA, can stabilize the physis after partial resection.
- Use of such materials is recommended for large physeal arrests in weight-bearing areas.
- This approach may help prevent growth disturbances predicted by the Heuter-Volkman law.