Effect of a modular neck hip prosthesis on anteversion and hip rotation in total hip arthroplasty for developmental dysp
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ORIGINAL ARTICLE Artificial Skin, Muscle, Bone / Joint, Neuron
Effect of a modular neck hip prosthesis on anteversion and hip rotation in total hip arthroplasty for developmental dysplasia of the hip Ema Nakahara1 · Keisuke Uemura1 · Wataru Ando1 · Hidetoshi Hamada2 · Masaki Takao2 · Nobuhiko Sugano1 Received: 2 July 2019 / Accepted: 12 February 2020 © The Japanese Society for Artificial Organs 2020
Abstract Total hip arthroplasty (THA) is often required to decrease the excessive anatomical femoral anteversion (AA) in devel‑ opmental dysplasia of the hip. Studies have recommended decreasing the AA via the use of a retroverted modular neck. However, hip rotation after THA may strengthen or weaken the effect of changing the AA. Thus, the present study analyzed the effect of a retroverted neck on AA and hip rotation. Patients who underwent THA using a straight neck (ST group) or a 15° retroverted neck (RV group) in a version changeable dual modular system (Mainstay stem, Kyocera, Kyoto, Japan) were retrospectively reviewed. After matching for age, body mass index, and surgical approach, 44 patients were included in each group. The AA and hip rotation (femoral rotational angle: FRA) were measured on CT images acquired preoperatively and 1 month after THA, and were compared between the groups. The mean ± standard deviation preoperative AA of the ST group (26.1 ± 10.7°) was significantly smaller than that of the RV group (44.2 ± 7.8°) (p
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