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Updated: Jul 31, 2026
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Ipsilateral varus knee alignment correlates with increased femoral stem anteversion in primary total hip arthroplasty
Kwang Woo Nam1,2, Tsung-Yuan Tsai1, Dimitris Dimitriou1
1Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.
Purpose:
The purpose of this study was to evaluate whether the ipsilateral knee alignment secondary to knee osteoarthritis affect positioning of the femoral component anteversion during total hip arthroplasty.
Methods:
Preoperative and postoperative computed tomography-based 3-D femoral models were reconstructed for 20 total hip arthroplasty patients. Prosthetic femoral stem and native femoral anteversion was measured and compared.
Results:
An average increase by 4.5° ± 8.1° in femoral anteversion was found following total hip arthroplasty (p = 0.02). Strong positive correlation was found between the knee varus angle and the changes in femoral anteversion (R = 0.87, p<0.0001). The knee alignment was an independent factor for predicting the intraoperative positioning of femoral stem anteversion.
Conclusions:
The ipsilateral knee varus deformity should be considered to optimise the femoral component position during contemporary total hip arthroplasty.
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