应用骶骨-股骨头-耻骨角预测骨盆倾斜角的可行性

Feasibility of using sacro-femoral-pubic angle to estimate pelvic tilt

目的：探讨骨盆冠状面参数骶骨一股骨头一耻骨角（sacro—femoral—pubic angle，SFP）用于计算中国汉族成人骨盆倾斜角（pelvic tilt，PT）的可行性。方法：本组研究对象为37例中国汉族正常成人（男16例，女21例），平均年龄32．6岁（18．55岁），分为A组（男性，16例）和B组（女性，21例）。均有站立位全脊柱正侧位X线片（包含骨盆和髋臼）．在冠状面和矢状面上均能清晰显示脊柱和骨盆骨性标志。通过hnage—ProPlus6．0图像分析软件测量PT、SFP和骶骨倾斜角（sacralslope，SS）；采用SPSS16．0软件对PT和SFP进行相关性分析，并作SFP和胛的线性回归分析。结果：37例正常中国汉族成人中，平均SFP为69．6。±5．5。（57．8。～77．2。），平均PT为9．8。±5．50（2_3022．60），平均SS为31．10°10．1。（22．1-46．7）。SFP和frr有显著相关性，Pearson相关系数为0．824（P〈0．001）。通过线性回归分析，Prr可以通过简化公式进行计算：PT=78一SFP，在±4．5。范围内，公式预测能力为78．4％。A组的SFP与PT相关性及公式预测能力比B组更好（A组：r=0．856，预测能力81-3％；B组：r=0．738，预测能力76．2％）。结论：在中国汉族成人中，当侧位x线片上股骨头显示不清，准确测量PT较困难时，可以通过公式用冠状面SFP角来计算矢状面PT值。

Objectives： To investigate the reliability of sacro-femoral-pubic angle（SFP） in estimating pelvic tih（PT） in adults of Chinese Han nationality. Methods： Thirty-seven normal adults of Chinese Han nationality （21 females and 16 males） with a mean age of 32.6 years （range, 18-55 years） were included in this study. Subjects were divided into group A（16 males） and group B（21 females）. Full-length antero-posterior and later- al spine radiographs were available and all spinal and pelvic anatomic landmarks （pelvis and femoral heads） were identified. PT, SFP, and sacral slope（SS） were calculated by validated digital analysis software（Image-Pro Plus 6.0）. The correlation between SFP angle and pelvic tilt was evaluated by Pearson coefficient, followed by the linear regression analysis between SFP and PT. Results： The average SFP, PT, and SS was 69.6-＋5.5° （range, 57.8°-77.2°）, 9.8°-＋5.5°（range, 2.3°-22.6°）, and 31.1°_＋10.1°（range, 22.1°-46.7°）, respectively. Significant correlation between SFP and PT was observed and the Pearson＇s correlation coefficient was 0.824 （P〈0.O01）. According to the linear regression analysis, PT could be estimated by the formula： PT=78-SFP, and in the range of ＋4.5°, the predictive potential of the formula was 78.4%. The correlation and predictive potential of group A was better than that of group B（group A： r=0.856 and predictive potential=81.3%; group B： r=0.738 and predictive potential=76.2%）. Conclusions： By the above mentioned formula, the FF value in the sagittal plane can be calculated based on the SFP value when it is difficult to be accurately measured due to the poor visualization of the femur heads in adults of Chinese Han nationality.