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Extensor mechanism allograft reconstruction after total knee arthroplasty
R Stephen J Burnett1, Richard A Berger, Craig J Della Valle
1Department of Orthopaedic Surgery, Barnes Jewish Hospital, Washington University, 660 South Euclid Avenue, Campus Box 8233, St. Louis, MO 63110, USA. burnetts@msnotes.wustl.edu
The Journal of Bone and Joint Surgery. American Volume
|September 6, 2005
Summary
Tightly tensioning extensor mechanism allografts during revision total knee arthroplasty is crucial for successful reconstruction. Loosely tensioned grafts lead to failure, while tightly tensioned grafts restore knee extension effectively.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Disruption of the extensor mechanism is a rare but severe complication following total knee arthroplasty.
- Reconstruction techniques using allografts are evaluated for revision total knee arthroplasty.
Purpose of the Study:
- To evaluate two techniques for reconstructing a disrupted extensor mechanism using an allograft in revision total knee arthroplasty.
- To determine the impact of allograft tensioning on clinical outcomes.
Main Methods:
- Twenty patients underwent revision total knee arthroplasty with an extensor mechanism allograft.
- Group I (n=7): Minimally tensioned allograft.
- Group II (n=13): Tightly tensioned allograft in full extension.
Main Results:
- Group I showed clinical failure with significant extensor lag (59 degrees) and low Hospital for Special Surgery (HSS) scores (52).
- Group II demonstrated clinical success with minimal extensor lag (4.3 degrees) and high HSS scores (88).
- No significant difference in postoperative knee flexion was observed between groups.
Conclusions:
- Initial tensioning of the extensor mechanism allograft is critical for successful revision total knee arthroplasty.
- Tightly tensioned allografts in full extension restore knee extension and lead to favorable clinical outcomes.
- Loosely tensioned allografts result in persistent extensor lag and clinical failure.