Patellar Dislocation With Genu Valgum Treated by DFO

Full article available online at Healio.com/Orthopedics. Search: 20130523-35 Congenital habitual patellar dislocation is a rare condition of the knee where the patella dislocates during flexion and relocates during extension. The congenital form is permanent, irreducible, and presents at birth. It is characterized by a short quadriceps and a major patellofemoral dysplasia and short height. This article presents a rare case of a 27-year-old woman with recurring bilateral habitual dislocation of the patella after a failed previous proximal and distal realignment procedure. Clinical examinations of both knees revealed genu valgus knees and lateral joint pain that recurred after several previous operations. Radiographs of both knees showed patellar dislocation and genu valgum associated with patellofemoral dysplasia and osteoarthritis of the lateral compartment. Long-leg standing radiographs showed an anatomic tibiofemoral angle of right 13° and left 6° valgus and a mechanical tibiofemoral angle of right 8° and left 2° valgus and weightbearing line of 65% on the right and 48% on the left. The authors performed a distal femoral closing wedging osteotomy to correct the valgus deformity, and then percutaneous lateral release and medial reefing were performed to stabilize the patellas of both knees simultaneously. Patellar Dislocation With Genu Valgum Treated by DFO Jae Ho Kwon, MD; Jong In KIM, MD; Dong-Hyun Seo, MD; Kyung-woon Kang, MD; JI Ho naM, MD; Kyung-wooK nHa, MD The authors are from the Department of Orthopaedic Surgery, Inje University, Ilsan Paik Hospital, Ilsan, Korea. The authors have no relevant financial relationships to disclose. Correspondence should be addressed to: Kyung-Wook Nha, MD, 2240, Department of Orthopaedic Surgery, Inje University, Ilsan Paik Hospital, Daehwa-dong, Ilsan-Segu, Koyang-Si, Ilsan, Korea, 411706 (kwnhamj@hotmail.com). doi: 10.3928/01477447-20130523-35 Figure: Preoperative clinical photograph of the patient showing valgus knee with previous operation scars.