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Edge loading of patellar components after total knee arthroplasty
F E Glaser1, R S Gorab, T Q Lee
1Orthopaedic Biomechanics Laboratory, Veterans Affairs Medical Center, Long Beach, California 90822, USA.
The Journal of Arthroplasty
|July 31, 1999
Summary
Total knee arthroplasty (TKA) can lead to edge loading and high patellofemoral contact pressures, potentially causing component failure. Reducing these pressures is crucial for improving outcomes after TKA.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Biomaterials Science
Background:
- Patellofemoral joint complications are a concern following total knee arthroplasty (TKA).
- Understanding biomechanics of TKA is essential for improving implant longevity and patient outcomes.
Purpose of the Study:
- To assess patellofemoral joint kinematics, contact characteristics, and potential failure modes after TKA.
- To evaluate two contemporary TKA systems under simulated physiological loading.
Main Methods:
- Utilized human cadaver knees with two anatomic TKA systems.
- Employed electromagnetic tracking for patellofemoral kinematics.
- Used Fuji pressure-sensitive film for contact area, pressure, and pattern analysis.
Main Results:
- Observed edge loading of patellar components at higher knee flexion angles in both TKA systems.
- Peak contact pressures exceeded the yield strength of ultra-high-molecular-weight polyethylene at loaded regions.
- Identified specific contact patterns associated with edge loading.
Conclusions:
- Contemporary TKA systems exhibit edge loading and high contact pressures.
- These pressures may compromise the longevity of ultra-high-molecular-weight polyethylene components.
- Minimizing edge loading and contact pressures could reduce patellofemoral complications and component failure post-TKA.