Abstract Objective To measure native acetabular anteversion before total hip arthoplasty(THA) and acetabular component anteversion after THA using computed tomography(CT) method,and to evaluate the accuracy of acetabular component anteversion positioning with transverse acetabular ligament (TAL) orientation.Methods Totally 40 patients (44 hips) undergoing primary THA in our hospital from January 2015 to January 2016 were enrolled in this study.All the arthroplasty were performed by one surgeon.we used posterior approach and positioned the acetabular component anteversion with TAL orientation,in which the inferomedial rim of the cup had been positioned parallel to the transverse acetabular ligament intraoperatively.Preoperatively and postoperatively,all the patients were examined by CT scan.We measured radiographic cup anteversion angle and native acetabular anteversion using a CT scan method.Acetabular component anteversion and native acetabular anteversion were statistically analyzed.Results In all the 44 hips,TAL were identified.The mean acetabular component anteversion was (21.37±9.69)°,which was no significantly different from preoperatively native acetabular anteversion (P>0 05).Among them,acetabular component anteversion of women and men were (24.59±11.57)°,(20.28±8.76)° respectivly,which was no significantly different from those preoperatively native acetabular anteversion (P>0.05).The preoperatively native acetabular anteversion was significantly higher in females than in males(P<0.05).Conclusion We suggest that the transverse acetabular ligament is a practical anatomical landmark for precise determining cup anteversion in primary THA.
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