Extensor Mechanism Reconstruction With an Allograft After Total Knee Arthroplasty

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Abstract
The authors report on a series of 15 knees in which an extensor mechanism allograft was used to treat a rupture of the patellar tendon associated with a total knee arthroplasty. Nine of the knees have greater than two-year follow-up evaluation (average, 4.1 years; range, 2.3–7 years). Postoperatively, the average flexion was 106°. All but three patients achieved full passive extension. Six of the nine knees had no extensor lag. The average postoperative clinical score for the follow-up group was 78 points. Graft complications include one early graft rupture, one early quadriceps junction failure, and one patellar component loosening. One graft fractured after revision of a metal-backed patella.

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