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Open Orthop J. 2011 Jan 7;5:17-9. doi: 10.2174/1874325001105010017.

Patella Infera in an HIV Positive Patient Following Total Knee Arthroplasty.

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  • 1Orthopaedic Department, Center for Musculoskeletal Surgery, Berlin, Germany.


A lowering of the patella after total knee arthroplasty is accompanied by pain and a restriction of the range of motion. With its etiology being unclear at present, a multifactorial genesis is under discussion. For the first time, we present a case report describing an HIV infection as a possible cause of patella infera.A 54-year-old HIV-positive woman developed patella infera (Insall-Salvati ratio 0.6) with a painful restriction of motion 18 months after implantation of a bicondylar surface prosthesis. By changing to a partially coupled endoprosthesis, distalization of the joint line and partial patellar resection, the patient was free of symptoms with a ROM of 0°/0°/110°.All risk factors known from the literature could be excluded in this case, so that the presence of an HIV infection has to be discussed as a possible cause.


Total knee arthroplasty; human immunodeficiency virus; patella infera.

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