Does a computed tomography-based navigation system reduce the risk of dislocation after total hip arthroplasty in patien
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ORIGINAL ARTICLE Artificial Skin, Muscle, Bone / Joint, Neuron
Does a computed tomography‑based navigation system reduce the risk of dislocation after total hip arthroplasty in patients with osteonecrosis of the femoral head? A propensity score analysis Kazuma Takashima1 · Takashi Sakai1,2 · Shu Amano3 · Hidetoshi Hamada1 · Wataru Ando4 · Masaki Takao1 · Toshimitsu Hamasaki5 · Nobuo Nakamura6 · Nobuhiko Sugano4 Received: 1 May 2019 / Accepted: 5 February 2020 © The Japanese Society for Artificial Organs 2020
Abstract This study aimed to investigate whether use of a computed tomography (CT)-based navigation system reduce the risk of dislocation after total hip arthroplasty (THA) in patients with osteonecrosis of the femoral head (ONFH). A total of 271 hips from 192 consecutive patients that underwent primary THA for ONFH were included. There were 110 hips in non-navigation group, and 161 hips in navigation group. After applying exclusion criteria, 209 hips from 149 patients were selected for analysis. Clinical outcomes and complication rates were evaluated, and implant alignments were also calculated. To identify whether the navigation system was useful to prevent dislocation, the inverse probability of treatment-weighted Cox regression analysis using a propensity score in relationship to sex, age at surgery, body mass index, and femoral head size was performed. No significant difference was observed in clinical scores between both groups. Dislocation was significantly lower in the navigation group (3 hips, 2.7%) than in the non-navigation group (11 hips, 11.2%; p = 0.012), whereas periprosthetic joint infection and aseptic loosening did not differ between the groups. Variance of cup inclination and anteversion angles was smaller in the navigation group than in the non-navigation group (p
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