Department of Orthopaedic Surgery, Wake Forest University Health Sciences, Winston-Salem, North Carolina 27157, USA.
J Arthroplasty. 2012 Mar;27(3):341-6. doi: 10.1016/j.arth.2011.06.008. Epub 2011 Aug 5.
Patients will often perceive a change in lower limb length after total knee arthroplasty (TKA). From this observed finding, we asked how frequently does a change in limb length occur after TKA. Preoperative and postoperative full-length standing radiographs were obtained for 102 knees in 98 patients who underwent TKA. Digital radiography software was used to measure the mechanical axis and limb length of the operative and nonoperative legs. Overall, 83% of the knees measured showed an increase in limb length after TKA. Preoperative varus alignment was associated with an average lengthening of 5.2 mm. Preoperative valgus alignment was associated with an average lengthening of 8.4 mm. Patients with a valgus deformity greater than 10° demonstrated the greatest average lengthening. It is the conclusion of this study that limb lengthening occurs frequently after TKA, back to a length similar to the nonoperative limb.
患者在全膝关节置换术后（TKA）后常常会感知到下肢长度的变化。基于这一观察结果，我们想了解 TKA 后下肢长度的变化有多频繁。对 98 例接受 TKA 的 102 膝患者的术前和术后全长站立位 X 线片进行了研究。使用数字 X 线摄影软件来测量手术侧和非手术侧的机械轴和肢体长度。总体而言，83%的膝关节在 TKA 后出现肢体长度增加。术前内翻对线与平均延长 5.2mm 相关。术前外翻对线与平均延长 8.4mm 相关。畸形大于 10°的患者表现出最大的平均延长。本研究的结论是 TKA 后肢体长度经常延长，恢复到与非手术侧相似的长度。
