Nishitani K, Hatadaa R, Kuriyama S, et al. - A total of 101 knees that underwent TKA were involved in order to assess the impact of an anterior condylar height (ACH) change on postoperative knee flexion, New Knee Society Scores (2011KSS), and patellofemoral contact force. At one year, a postoperative decrease in ACH associated with improved flexion. On multivariable linear regression, decreases in medial ACH and preoperative flexion were related to raised flexion. A reduction in ACH was related to betterments in advanced activities in 2011KSS. On computer simulation, all three cases with decreased and raised medial ACHs exhibited reduced and improved patellofemoral contact forces, respectively. Thus, an independent predictor of knee flexion following TKA wss a change in ACH. Moreover, greater decrease in ACH was related to enhanced flexion following TKA, while an improvement in postoperative ACH could be a risk factor for flexion loss.