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Patellofemoral instability in total knee arthroplasty
1Centre Medico-Chirurgical Du Cedre, Bois-Guillaume, France.
The Journal of Arthroplasty
|January 1, 1989
Summary
Patellofemoral instability after total knee arthroplasty is a common complication. Correcting component malalignment and extensor mechanism imbalance is crucial for successful treatment, avoiding recurrence.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Patellofemoral instability is a significant complication after total knee arthroplasty (TKA).
- Despite advancements, the incidence of this complication remains high, necessitating further investigation into its causes and management.
Purpose of the Study:
- To analyze the causes of patellofemoral instability following TKA.
- To provide guidance on appropriate surgical interventions for this complication.
Main Methods:
- Comprehensive analysis of potential causes of patellofemoral instability.
- Review of surgical techniques and component considerations in TKA.
Main Results:
- Component malalignment (valgus, internal rotation, lateral displacement) is a primary cause.
- Patellar underresection or femoral oversizing can lead to retinacular tightness.
- Addressing the root cause, such as component revision or extensor mechanism realignment, is essential.
Conclusions:
- Identifying and correcting the specific cause of patellofemoral instability is paramount.
- Component revision for malalignment and realignment for extensor imbalance are effective strategies.
- Lateral release alone is insufficient and may lead to recurrence.