躯体X线测量板的研制和应用

目的 介绍躯体X线测量板的制作方法 ,探讨其有效性、重复性,为临床X线测量提供一套精确、实用、经济的方法 和工具.方法 设计和制作躯体X线测量板.使用下肢模拟板9块作为金标准,比较躯体X线测量板测量值与金标准值之间的差别.评价测量板的有效性、准确性.选择膝骨性关节炎患者21侧下肢,采用躯体X线测量板测量下肢的长度和角度,比较同一观察者在不同时间对同一患者肢体测量结果 ,评价观察者内重复性;比较不同观察者采用测量板所测结果 ,评价观察者间重复性.结果 测量板上的标志物可清晰地投照在X线片上.模拟板测量的角度与金标准相比差异很小,平均绝对差为0.10°～0.21°,错误比为0.12%～3.15%,r均接近1.与金标准相比长度的差异也很小,平均绝对差为O.05～O.16 cm,错误比为0.12%～O.28%,r均接近1.同一观察者在不同时间采用测量板所测的长度和角度值有很好的相关性,,接近1(P<0.01).平均绝对差分别为0.1～0.37 cm和0.55°,错误比0.31%～0.97%.不同观察者采用测量板所测的长度和角度值有很好的相关性,r接近1(P<0.01),平均绝对差分别为0.05～0.13 cm和0.39°,错误比0.16%～0.35%.结论 躯体X线测量板可测量肢体的长度和角度,其测量结果 与实际值有很好的一致性,测量精确、可靠,实用、经济,容易操作,重复性好,是进行X线测量的理想方法 和工具.

Validation and repeatability of Limb X Film Measuring Plate

Objective To study the efficacy and repeatability of the Limb X Film Measuring Plate (LXMP)in clinical x film measurement of lengths and angles of limbs.Methods The LXMP was de- signed and manufactured for testing.Three known points in 9 templates were taken as golden standards.which were to be compared with measuring results of these projected points on the X film for testing efficacy of LXMP.Twenty-one patients with knees osteoarthritis were selected.The lengths and angles of their lower limbs were measured twice with the help of LXMP by an observer at different time intervals for testing in. Tra-observer repeatability.Two observers measured once on films at the same time for testing inter-observer repeatability.The correlation coefficients,mean absolute difierences between the repeated measurements,and error rate were calculated. Results The points on LXMP could be seen clearly on X film.Validation tests showed the differences in angle measurement between golden standards and measuring results for those pro- jeted points on the X film were insignificant.with mean absolute difference being O.10.-0.21,error rate being 0.12%-3.15%and r being close to 1.The differences in length measurement were insignificant ei- ther,with mean absolute differenee being 0.05 cm-0.16 cm.error rate being 0.12%-o.28%and r being close to 1.The intra-observer repeatability test for beth angles and lengths showed that r was close to I.mean absolute diffefences 0.55.and 0.1-0.37cm and error rate 0.3l%-O.97%.while the inter-observer re- peatability test showed that r was close to 1.mean absolute difierences o.39.and0.05-0.13cm and error rate O.16%-O.35%. Conclusion The Limb X Film Measuring Plate Can be used for accurately mcasuring limb lengths and angles with good efficacy and repeatability.