影响正常人群骨盆入射角调节脊柱骨盆矢状面平衡的因素

The factors influencing the adjustment function of PI on spinal sagittal balance in normal subject

目的研究正常人群骨盆入射角调节脊柱骨盆矢状面平衡的影响因素。方法 2008年1月至6月门诊筛选正常人群全长脊柱X线片106例,测量骨盆入射角(PI)、骶骨倾斜角(SS)、骨盆倾斜角(PT)、腰椎前凸角(LL)、胸椎后凸角(TK),对数据进行分析。结果研究人群按不同骨盆姿势分为38例高SS/低PT组:PI和LL均值各为(50.85±10.01)°,(49.41±9.84)°,回归方程LL=0.571PI+20.395,68例低SS/高PT组:PI和LL均值各为(49.14±12.00)°,(39.17°±10.98)°,回归方程LL=0.531PI+13.079。组内显示PI与SS、LL,SS与LL正相关,呈线性回归,组间显示PI无统计学差异,SS、PT、LL有统计学差异。结论 (1)PI不能单纯确定LL变化,必须考虑骨盆姿势的影响。(2)相同PI下,骨盆越前倾,LL越大;相同骨盆姿势下,PI越大,LL越大。

Objective To investigate the factors influencing the adjustment function of PI on spinal sagittal balance in normal subject.Methods 106 normal subjects were selected to perform a full standing spinal lateral radiograph including spine,pelvis and both hip joints from January 2008 to June 2008 in our outpatient department.The radiographs were digitized and 5 sagittal parameters were measured on lateral radiographs：pelvic incidence,sacral slope,pelvic tilt,lumbar lordosis and thoracic kyphosis,followed by the statistic analysis.Results 106 cases of normal subjects were separately divided into 38 cases,belonging to high SS/lower PT,with the mean value of PI and LL of（50.85±10.01）°and（49.41±9.84）°respectively and the regression equation of LL=0.571PI＋20.395;68 cases,belonging to lower SS/high PT,with the mean value of PI and LL of（49.14±12.00）°and（39.17°±10.98）°respectively and the regression equation of LL=0.531PI＋13.079°.The two groups demonstrated interclass positive correlation and linear regression between PI and SS,PT and LL,SS and LL respectively,while significant difference of SS,PT and LL between the two groups was showed except for that of PI.Conclusions（1）LL can＇t be concluded only by PI for the influence of pelvic posture.（2）Under the same PI,the more anteverted pelvis,the more large LL,otherwise,the more large PI,the more large LL under the same pelvic posture.