多层螺旋CT后处理测量肱骨头扭转角的实验研究

Experimental Study of Method of Measuring Humeral Head Retroversion Angle with MSCT Postprocessing Technique

目的探讨多层螺旋CT后处理测量肱骨头扭转角的方法。方法收集51根干肱骨标本,50个肩关节防腐湿标本,行16层螺旋CT扫描,用薄层多平面重组(MPR)、厚层MPR测量肱骨头扭转角,并与容积再现(VRT)测量肱骨头扭转角比较,进行统计学处理。结果肱骨头扭转角最小值3.3°,最大值57°,101根肱骨头扭转角三种测量方法数据分别为:(25.9±10.9)°、(25.8±10.8)°、(26.0±11.3)°,经统计学处理三种测量方法统计学差异无显著性差异(P>0.05)。结论肱骨头扭转角变异较大,肩关节假体扭转角设计应个性化;多层螺旋CT厚层MPR测量肱骨头扭转角的方法是适用于标本及活体,VRT测量肱骨头扭转角的方法是适用于标本。

Objective To investigate the method of measuring the humeral head retroversion angle with multi-slice spiral CT postprocessing technique. Methods Fifty-one dry humerus specimens and 50 wet antieorrosive shoulder specimens of Chinese adults were scanned with siemens somatom sensation 16 scanner. The humeral head retroversion angle was analyzed with postproeessing technique of thin multiplanner reformation（MPR）, thick MPR and volume rendering technique （VRT）. The total data on humeral head retroversion an- gle were analyzed by statistics. Results The humeral head retroversion angle ranged from 3.3° to 57°. The humeral head retroversion angle of 101 humerus were （25.9±10.9）° , （25.8±10.8）°. （26.0±11.3）° respectively. The statistics showed that there was no significant difference among the three measurement methods（P〉0.05）. Conclusion The humeral head retroversion angle is markedly variable, and the design of humeral head retroversion angle of shoulder prosthesis should be individual. The method of measuring the humeral head retroversion angle with thick multiplanner reformation （MPR） of MSCT refers to humerus specimens and the human being. The method of VRT refers to humerus specimens.