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Updated: Aug 10, 2025
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Component Asymmetry in Bilateral Cementless Total Hip Arthroplasty
Seung Hun Woo1, Won Chul Shin1, Jung Bum Han1
1Department of Orthopaedic Surgery, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
Background:
This study investigated the results of component asymmetry (CA) in bilateral cementless total hip arthroplasty (THA).
Methods:
This study included 300 patients, who underwent bilateral cementless THA between April 2000 and December 2017. They were divided into the component symmetry (CS) and CA groups; CA group was sub-classified into acetabular component asymmetry (ACA) and femoral component asymmetry (FCA). Radiologic and clinical outcomes of the CA group were compared with those of the CS group.
Results:
The incidence of CA was 25.7% (77/300 patients), including 55 patients with ACA, 34 patients with FCA, and 12 with both components asymmetric. The mean time interval between operations in the CA group was significantly longer than that in the CS group (p < 0.001). The mean differences in horizontal and vertical distances from teardrop to the center of rotation of the acetabular component between both hips in the ACA group were significantly larger than those in the CS group (p = 0.033 and p < 0.001, respectively). The mean femoral component alignment angle difference between both hips was significantly larger in the FCA group than in the CS group (p < 0.001). The mean Harris Hip Score at last follow-up of the CA group was similar to that of the CS group.
Conclusions:
CA in patients undergoing bilateral cementless THA was not rare, especially with a longer time interval between operations. Regardless of CA, when stable fixation of the components was achieved, satisfactory radiologic and clinical outcomes were obtained.
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