Anderson Orthopaedic Research Institute, Alexandria, 2501 Parkers Lane, VA 22036, USA.
J Arthroplasty. 2011 Sep;26(6 Suppl):28-34. doi: 10.1016/j.arth.2011.03.045. Epub 2011 Jul 1.
We sought to determine if the rotating platform (RP) high-flex design provides improved flexion compared with the standard RP total knee. A total of 142 patients were randomized to receive an RP flex (RP-F) or RP TKA. Supine flexion was measured with a goniometer and lateral x-ray. There was no difference in flexion measured at any interval between groups (1-year clinical flexion RP, 124.0°; RP-F, 124.2°; P = .949; 1-year x-ray flexion RP, 117.9°; RP-F, 117.6°; P = .985). There was no difference between groups comparing the improvement from preoperative to 1-year postoperative flexion (RP-F, 5.2°; RP, 4.1°; P = .580). There were 13 patients with postoperative patellar crepitus, with more in the RP-F group (RP-F, 11 patients [16.7%]; RP, 2 patients [3.2%]; P = .017). Owing to these results, coupled with the increased bone resection and higher cost, we no longer routinely use the RP-F design.
我们试图确定旋转平台（RP）高弯曲设计是否比标准 RP 全膝关节提供了更好的弯曲度。共有 142 名患者被随机分为接受 RP flex（RP-F）或 RP TKA。采用量角器和侧位 X 线测量仰卧位屈曲度。两组在任何间隔的测量屈曲度均无差异（1 年临床屈曲度 RP，124.0°；RP-F，124.2°；P =.949；1 年 X 射线屈曲度 RP，117.9°；RP-F，117.6°；P =.985）。两组之间从术前到 1 年术后屈曲度的改善没有差异（RP-F，5.2°；RP，4.1°；P =.580）。术后有 13 例出现髌骨弹响，RP-F 组更多（RP-F，11 例[16.7%]；RP，2 例[3.2%]；P =.017）。由于这些结果，再加上骨切除量增加和成本增加，我们不再常规使用 RP-F 设计。
