Ludloff截骨修复矫治拇外翻的三维力学特点

背景：目前针对Ludloff截骨三维特点的研究甚少,且结论稍有不同,导致不能准确地理解其截骨特点。目的：分析Ludloff截骨技术修复矫治拇外翻的三维力学特点。方法：采用长86.56mm、直径30.65mm的木质圆柱体,进行Ludloff截骨矫治拇外翻的模拟试验,测量并记录数据。结果与结论：圆柱体的长度随矫形程度的增加而逐渐短缩;无论截骨面偏向跖侧、背侧或水平,截骨的结果均导致远端内旋。Ludolff截骨矫治拇外翻的结果是使截骨远端呈内旋,这对改善第一跖趾关节生物力学有积极的作用。对于有明显跖骨痛的患者可采用偏向跖侧15°～20°的截骨面;对于Ⅰ/ⅡIMA（≥30°）的患者,应谨慎使用Ludolff截骨。

Three-dimensional mechanics characteristics of the Ludloff osteotomy in repair of hallux valgus

BACKGROUND：Now,three-dimensional studies related to the Ludloff osteotomy are little,and the conclusions are different.We still cannot fully understand the characteristic of osteotomy.OBJECTIVE：To study the characters of three-dimensional mechanics of the Ludloff osteotomy in repair of hallux valgus.METHODS：A wooden cylinder of 86.56 mm long and 30.65 mm diameter was selected for simulation test of the Ludloff osteotomy in repair of hallux valgus.Data were measured and recorded.RESULTS AND CONCLUSION：As the extent of the correction increased,the length of the cylinder became shorter and shorter,and the distal end of the cylinder became pronated constantly.Ludloff osteotomy makes the first metatarsal head constant internal rotation so that it is benefit for improving the biomechanics of the metatarsophalangeal joints.A section of 15-20 degrees deviating to plantar should be suggested for patients with serious metatarsalgia.Ludloff osteotomy should be taken cautiously for those patients whose Ⅰ/ⅡIMA is more than 30 degrees.