A CT study of combined anteversion after total hip arthroplasty
10.3969/j.issn.1671-8348.2014.24.003
- VernacularTitle:全髋置换术后髋臼和股骨假体联合前倾角的CT 研究
- Author:
Ming LV
;
Jian WU
;
Jian LIU
;
Yong DOU
;
Yixin ZHOU
;
Dejin YANG
- Publication Type:Journal Article
- Keywords:
total hip arthroplasty;
acetabulum;
femur;
anteversion;
combined anteversion;
CT
- From:
Chongqing Medicine
2014;(24):3127-3129,3132
- CountryChina
- Language:Chinese
-
Abstract:
Objective Our goal was to summarize the clinical data of the combined anteversion of both stem and cup measured by CT method after total hip arthroplasty and to evaluate the accuracy of conventional freehand technique for positioning the combined anteversion by comparing the results to the Dorr′s “safe zone” .Methods We prospectively studied 206 primary total hip arthro-plasties .For all the arthroplasties ,we used posterior lateral approach and conventional freehand technique without any alignment guides .12 surgeons performed all the 206 arthroplasties .Postoperatively all the patients were examined by CT scan within one week .We measured radiographic anteversion of acetabular components using a 3D CT method and measured femoral components anteversion using CT scans .Acetabular anteversion ,femotal component anteversion and combined anteversion were statistically ana-lyzed .Results In all the 206 hips ,the mean acetabular components anteversion was 16 .23° ± 8 .27° ,76 .21% of cases was in Lewin-neck′s safe range of 5°-25° .The mean femoral components anteversion was 23 .79° ± 10 .70° .The mean combined anteversion was 40 .02°± 13 .50° ,65 .05% was in safe range of 25°-50°recommended by Dorr .The acetabular components anteversion ,femoral com-ponents anteversion and combined anteversion placed by senior surgeons was no significantly different from those placed by junior orthopedic surgeons(P>0 .05 ,0 .726 ,0 .143 ,0 .061 ,respectively) .Conclusion The conventional freehand technique is an inaccurate method for positioning the cup anteversion or the combined anteversion .The experience of surgeons can not significantly improve this accuracy .
