Failure of the Femoral and Tibial Components Following Anterior Cruciate Ligament Injury After Robotic-Assisted Bicruciate-Retaining Total Knee Arthroplasty

We report a case of failure of the femoral and tibial components due to anterior cruciate ligament (ACL) injury after robotic-assisted bicruciate-retaining total knee arthroplasty. A 70-year-old woman with osteoarthritis underwent robotic-assisted bicruciate-retaining total knee arthroplasty. At 8 months after surgery, persistent knee pain and swelling of the knee joint were noted after fall in knee. We diagnosed a failure between the femoral and tibial components following an ACL injury. Proximal ACL injury and spin out of ultra-high molecular weight polyethylene were confirmed. We selected a constrained condylar knee prosthesis due to large bone attribution after femoral and tibial component removal. Postoperative three-dimensional computed tomography images suggested that excessive internal rotational alignment of the tibial component caused stress on the ACL.