title: Patella Infera in an HIV Positive Patient Following Total Knee Arthroplasty.
abstract: 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.
authors.affiliation: Orthopaedic Department, Center for Musculoskeletal Surgery, Berlin, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Matziolis
authors.forename: Lars
authors.initials: L
authors.lastname: Morawietz
authors.forename: Doerte
authors.initials: D
authors.lastname: Matziolis
authors.forename: Carsten
authors.initials: C
authors.lastname: Perka