多层螺旋CT后处理技术测量国人离体肩胛盂扭转角

In vitro measurement of adult Chinese scapula glenoid version angle with MSCT postprocessing technique

目的探讨应用MSCT后处理技术测量肩胛盂扭转角的方法。方法收集成人肩胛骨干标本50个、成人肩关节防腐湿标本50个,用16层螺旋CT扫描仪扫描,行轴位厚层、薄层多平面重组(MPR)测量肩胛盂扭转角,进行统计学分析。结果肩胛盂扭转角厚层MPR和薄层MPR测量值配对t检验统计学差异无统计学意义(P>0.05)。肩胛骨干、湿标本盂扭转角测值独立样本t检验差异有统计学意义(P<0.05)。厚层MPR测量肩胛骨干标本盂扭转角(-0.40±4.10)°,肩关节防腐湿标本盂扭转角(-3.00±4.49)°;薄层MPR测量肩胛骨干标本盂扭转角(-0.34±4.21)°,肩关节防腐湿标本盂扭转角(-2.70±4.54)°。结论多层螺旋CT厚层MPR测量肩胛盂扭转角简单、快捷。肩胛骨干、湿标本盂扭转角差异较大,肩胛骨扭转角呈后倾近3°,在肩关节假体设计中应考虑该解剖特点。

Objective To investigate method of in vitro measurement of adult Chinese scapula glenoid version angle with MSCT postprocessing technique.Methods Fifty dry scapula specimens and 50 wet anticorrosive shoulder specimens of adult Chinese were scanned with Siemens Somatom Sensation 16 scanner.The scapula glenoid version angle was measured with postprocessing technique of thick or thin multiplanner reformation（MPR）,and the data were analyzed statistically.Results The scapula glenoid version angle of dry scapula specimens and wet anticorrosive shoulder specimens was（-0.40±4.10）°,（-3.00±4.49）° with thick MPR,and（-0.34±4.21）°,（-2.70±4.54）° measured with thin MPR,respectively.There was significant difference of the scapula glenoid version angles between the dry scapula specimens and wet anticorrosive shoulder specimens（P 〈0.05）,but not between thick or thin MPR measurement（P 〉0.05）.Conclusion Measuring the scapula glenoid version angle with thick MPR of MSCT is simple and fast.The scapula glenoid version angle is markedly variable between the dry scapula specimens and wet anticorrosive shoulder specimens.The retroversion angle of scapula glenoid is about 3°,which should be considered in the design of shoulder prosthesis.