Hanratty B M, Thompson N W, Wilson R K, Beverland D E
Orthopaedic Outcomes Assessment Unit, Musgrave Park Hospital, Belfast BT9 7JB, UK.
J Bone Joint Surg Br. 2007 Jul;89(7):915-8. doi: 10.1302/0301-620X.89B7.18920.
We have studied the concept of posterior condylar offset and the importance of its restoration on the maximum range of knee flexion after posterior-cruciate-ligament-retaining total knee replacement (TKR). We measured the difference in the posterior condylar offset before and one year after operation in 69 patients who had undergone a primary cruciate-sacrificing mobile bearing TKR by one surgeon using the same implant and a standardised operating technique. In all the patients true pre- and post-operative lateral radiographs had been taken. The mean pre- and post-operative posterior condylar offset was 25.9 mm (21 to 35) and 26.9 mm (21 to 34), respectively. The mean difference in posterior condylar offset was + 1 mm (-6 to +5). The mean pre-operative knee flexion was 111 degrees (62 degrees to 146 degrees) and at one year postoperatively, it was 107 degrees (51 degrees to 137 degrees). There was no statistical correlation between the change in knee flexion and the difference in the posterior condylar offset after TKR (Pearson correlation coefficient r = -0.06, p = 0.69).
我们研究了后髁偏移的概念及其恢复对后交叉韧带保留型全膝关节置换术（TKR）后膝关节最大屈曲范围的重要性。我们测量了69例接受初次牺牲交叉韧带的活动平台TKR手术的患者术前和术后一年的后髁偏移差异，这些手术由同一位外科医生使用相同的植入物和标准化手术技术完成。所有患者均拍摄了真实的术前和术后外侧X线片。术前和术后后髁偏移的平均值分别为25.9 mm（21至35）和26.9 mm（21至34）。后髁偏移的平均差异为+1 mm（-6至+5）。术前膝关节平均屈曲度为111度（62度至146度），术后一年为107度（51度至137度）。TKR术后膝关节屈曲度的变化与后髁偏移差异之间无统计学相关性（Pearson相关系数r = -0.06，p = 0.69）。
