Management of the deficient patella in revision total knee arthroplasty.

Clinical Orthopaedics and Related Research
Ryan M GarciaVictor M Goldberg

Abstract

There are a number of options available to manage the patella when revising a failed total knee arthroplasty. If the previous patellar component is well-fixed, undamaged, not worn, and compatible with the femoral revision component, then it can be retained. When a patellar component necessitates revision and is removed with adequate remaining patellar bone stock, an onlay-type all-polyethylene cemented implant can be used. Management of the patella with severe bony deficiency remains controversial. Treatment options for the severely deficient patella include the use of a cemented all-polyethylene biconvex patellar prosthesis, patellar bone grafting and augmentation, patellar resection arthroplasty (patelloplasty), performing a gull-wing osteotomy, patellectomy, or the use of newer technology such as a tantalum (trabecular metal) patellar prosthesis. Severe patellar bone deficiency is a challenging situation because restoration of the extensor mechanism, proper patellar tracking, and satisfactory anatomic relationships with the femoral and tibial components are critical for an optimal clinical outcome. Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

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Dec 17, 2008·The Knee·Sani ErakCecil H Rorabeck
May 4, 2017·EFORT Open Reviews·Emmanuel Thienpont
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