The choice of implant used for primary total knee arthroplasty (TKA) may have an impact on clinical outcomes. Clinical outcomes after TKA with gradually reducing radius implants (group G) vs single-radius implants (group S) were evaluated among Asian patients. This study included 541 patients (754 knees) in group G and 187 patients (275 knees) in group S. Range of motion (ROM), flexion contracture, American Knee Society Knee and American Knee Society Function scores (KSKS and KSFS, respectively), and mechanical and anatomic tibiofemoral angles (MTFA and ATFA, respectively) were evaluated with electronic medical records. In univariate analysis, improvements in ROM, KSKS, and KSFS were significantly better in group G compared with group S at 1-year follow-up. Multivariable analyses showed greater ROM (4.52°, P=.002), decreased flexion contracture (−2.80°, P=.011), and improved KSKS (15.57, P<.001) at 1 year for group G vs group S. No significant differences in KSFS, MTFA, or ATFA were observed. Implant-related complications and radiologic loosening were not identified in either group at 2-year follow-up. The TKA implants with a gradually reducing radius showed greater 1-year improvements in ROM, flexion contracture, KSKS, and similar implant-related safety outcomes compared with a single-radius system. [Orthopedics. 202x;xx(x):xx–xx.]

用于初次全膝关节置换术 (TKA) 的植入物的选择可能会对临床结果产生影响。在亚洲患者中评估了使用逐渐减少的桡骨植入物（G 组）与单桡骨植入物（S 组）进行 TKA 后的临床结果。本研究包括 G 组 541 名患者（754 膝）和 S 组 187 名患者（275 膝）。运动范围 (ROM)、屈曲挛缩、美国膝关节协会膝关节和美国膝关节协会功能评分（分别为 KSKS 和 KSFS）和机械和解剖胫股角（分别为 MTFA 和 ATFA）用电子病历进行评估。在单变量分析中，与 1 年随访时的 S 组相比，G 组的 ROM、KSKS 和 KSFS 的改善明显更好。多变量分析显示更大的 ROM (4.52°, P=.002），屈曲挛缩减少（-2.80°，P =.011），并且 G 组与 S 组在 1 年时改善了 KSKS（15.57，P <.001）。KSFS、MTFA 或 ATFA 无显着差异被观察到。在 2 年的随访中，两组均未发现种植体相关并发症和放射学松动。与单半径系统相比，半径逐渐减小的 TKA 植入物在 ROM、屈曲挛缩、KSKS 和类似的植入物相关安全结果方面显示出更大的 1 年改善。[骨科。202x;xx(x):xx–xx。]