Patellar Instability After Total Knee Arthroplasty

Abstract

Common patellofemoral complications after total knee arthroplasty (TKA) include instability, patellar fracture, implant loosening, component breakage, osteonecrosis, and accelerated polyethylene wear. Nonsurgical management of these complications after TKA is almost always indicated initially but has been associated with mixed results. Because femoral or tibial component malposition is often the etiology of patellar complications, revision of the malpositioned TKA components is usually required. Proximal realignment for patellar maltracking in the setting of properly positioned and sized components is associated with good results. Isolated patellar component revision has been reported to have a high rate of complications.

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