Inui H, et al. - In bi-cruciate stabilized (BCS) total knee arthroplasty (TKA), a two cam-post mechanism is involved, which substitutes for the anterior cruciate ligament and posterior cruciate ligament (PCL) in order to achieve appropriate anteroposterior (AP) stability, so researchers here sought to report AP stability after BCS TKA and the relationship between AP and medial–lateral stability. They used a navigation system intraoperatively and the KT 2000 device postoperatively to measure AP stability. Outcomes revealed a positive relationship of AP stability of the BCS TKA with intraoperative medial stability; for AP stability of BCS TKA, surgical soft tissue handling focusing on medial stability is appropriate. Additionally, intraoperative AP translation seemed to be a predictive indicator for postoperative knee AP stability at 30° flexion.