PurposeTo study the impact of acetabular reaming depth on reconstruction of rotation center (RC) in unilateral primary total hip arthroplasty (UPTHA) and guide individualized preoperative design.Methods200 postoperative standard bilateral hip anteroposterior radiographs after UPTHA were included, which were collected from January, 2013 to June, 2017 in our hospital. Osteonecrosis of femoral head was the only diagnosis in this cohort. The parameters were measured on the anteropoterior radiographs by using RadiAnt DICOM viewer.ResultsThe average of the thickness of the teardrop is about 6.131.42mm. The parameter a (the difference value of the distance of bilateral RC and midline) was positively correlated with the parameter e (the acetabular reaming depth), and the Pearson correlation coefficient was 0.49 when P=0.05. Furthermore, the value of parameter (e) was 8.25mm when a2 (the distance from the center of the prosthesis femoral head to the vertical line across the midpoint of pubic symphysis) equaled a1 (the distance from RC of the healthy femoral head to the vertical line across the midpoint of pubic symphysis).Conclusions The reaming depth of the acetabulum could influence the reconstruction of RC during UPTHA. When the medial margin of the cup was placed about 2mm to the lateral border of the ipsilateral teardrop (the bottom of the ovum), the rotation center would be accurately restored.
[1]Jilin Univ, China Japan Union Hosp, Dept Orthoped, 126 Xiantai St, Changchun 130033, Jilin, Peoples R China.
[2]Jilin Univ, China Japan Union Hosp, Sci Res Ctr, 126 Xiantai St, Changchun 130033, Jilin, Peoples R China.
[3]Jilin Univ, Sch & Hosp Stomatol, Dept Orthodont, Changchun 130021, Jilin, Peoples R China.
(8.0+极速模式)