Abstract
Background
Side-to-side variability in the femoral neck anteversion angle (FA) reportedly varies
from 0.0° to 17.3°. To investigate the side-to-side variability in the FA and the
relationship between the FA and the morphology of the acetabulum in the Japanese population,
we performed a three-dimensional computed tomography (CT)-based study involving patients
with osteonecrosis of the femoral head (ONFH).
Methods
CT data were obtained from 170 nondysplastic hips of 85 patients with ONFH. The FA
and acetabular coverage parameters, including the acetabular anteversion angle, acetabular
inclination angle, and acetabular sector angle in the anterior, superior, and posterior
directions, were measured using three-dimensional CT. The distribution of the side-to-side
variability in the FA was evaluated separately for each of the five degrees.
Results
The mean side-to-side variability in the FA was 6.7° ± 5.3° (range, 0.2°–26.2°). The
distribution of the side-to-side variability in the FA was 0.0°–5.0° in 41 patients
(48.2%), 5.1°–10.0° in 25 patients (29.4%), 10.1°–15.0° in 13 patients (15.3%), 15.1°–20.0°
in 4 patients (4.7%), and >20.1° in 2 patients (2.4%). There was a weak negative correlation
between the FA and anterior acetabular sector angle (r = −0.282, P < 0.001) and a
very weak positive correlation between the FA and acetabular anteversion angle (r = 0.181,
P < 0.018).
Conclusions
The mean side-to-side variability in the FA was 6.7° ± 5.3° (range, 0.2°–26.2°) in
Japanese nondysplastic hips, and about 20% of the patients had a side-to-side variability
of >10°.
Keywords
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Article info
Publication history
Published online: March 04, 2023
Accepted:
February 23,
2023
Received in revised form:
February 17,
2023
Received:
October 3,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2023 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.
