Treatment of varus knee combined with extra-articular deformity with medial condyle sliding osteotomy during total knee arthroplasty: a case report

A 65-year-old female complained of progressive right knee pain, limited range of motion and obvious varus deformity of the right knee. She had a trauma history 20 years ago on femur side and treated by non-operative procedure. Preoperative radiographs showed severe osteoarthritis on medial side and patellofemoral joint. She had supracondylar malunion old fracture and varus deformity. So a total knee arthroplasty (TKA) was ordered. To balance the extension gap, medial condyle sliding osteotomy (MCSO) was made during the TKA. The bone block cut from the medial condyle was pulled distally until extension gap was balanced and then marked. Prosthetic components were implanted and then medial bone block was reduced into the medial prosthetic condyle after extra bone margin was removed. At 1 year follow-up, the knee was painless, stable, with satisfactory range of motion and improved function without any infection or aseptic lysis.