Hino K, et al. - Researchers assessed the midflexion laxity before and after Bi-cruciate substituting (BCS)-total knee arthroplasty (TKA) using a navigation system, and evaluated the association between intraoperative laxity and the maximum flexion angle after surgery. Compared to preoperative levels at midflexion range, varus–valgus laxity was better stabilized with BCS-TKA. Moreover, six months after surgery the maximum flexion angle significantly correlated with the intraoperative laxity at deep flexion range.