Rosenquist B, Wall G
Department of Oral and Maxillofacial Surgery, University Hospital of Lund, Sweden.
J Oral Maxillofac Surg. 1995 Nov;53(11):1276-82. doi: 10.1016/0278-2391(95)90584-7.
This study analyzed whether titanium plate osteosynthesis prevents mobility after Le Fort I osteotomy and, if not, how long the osteotomized segment is mobile.
In 10 patients aged 17 to 49 years, three metal bone markers were inserted below and three above the osteotomy during the Le Fort I procedure, each set forming a triangle. The patients were examined at intervals until 1 year postoperatively. At each examination two sets of x-ray stereograms were obtained; one in rest and one with pressure applied to the anterior part of the maxilla. The difference in position of the maxillary segment in relation to the reference segment between the two sets of stereograms, ie, the mobility, could thus be recorded. Findings of 0.4 degrees and 0.2 mm are considered significant.
Immediately after surgery mobility in the osteotomy site was found in 7 of the 10 patients. One year postoperatively mobility in the osteotomy site was still found in four patients.
Titanium plate osteosynthesis does not prevent mobility between the osteotomy segments after Le Fort I osteotomies. The osteotomized segment may remain mobile at least until 12 months after surgery. During this period the impact of the functional matrix may cause migration of the segment.
本研究分析了钛板接骨术是否能防止勒福Ⅰ型截骨术后骨段移动，若不能，则截骨段会移动多长时间。
10例年龄在17至49岁的患者，在勒福Ⅰ型手术过程中，于截骨线下方植入3枚金属骨标志物，上方植入3枚，每组形成一个三角形。术后定期对患者进行检查，直至术后1年。每次检查时获取两组X线立体图像；一组为静止状态，另一组为对上颌前部施加压力时的图像。这样就能记录两组立体图像中上颌骨段相对于参考骨段的位置差异，即移动度。0.4度和0.2毫米的测量结果被视为有意义。
10例患者中有7例在术后即刻发现截骨部位存在移动。术后1年时，仍有4例患者截骨部位存在移动。
钛板接骨术不能防止勒福Ⅰ型截骨术后截骨段之间的移动。截骨段至少在术后12个月内可能仍会移动。在此期间，功能基质的影响可能导致骨段移位。
