. (B and C) X‐ray examination before and after joint arthroplasty](CCR0-0-0000-g000){#ccr00000-fig-0000}  0.0. Case 0 {#ccr00000-sec-0000} -----------  An 00‐year‐old woman was treated with simultaneous bilateral TKA for knee osteoarthritis. For bilateral replacement, femoral and tibial cuts were achieved with IM femur jig and extramedullary tibial jig, respectively. 