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Clinical Orthopaedics and Related Research®

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01-10-2012 | Clinical Research

Acetabular Tilt Correlates with Acetabular Version and Coverage in Hip Dysplasia

Authors: Masanori Fujii, MD, PhD, Yasuharu Nakashima, MD, PhD, Taishi Sato, MD, Mio Akiyama, MD, Yukihide Iwamoto, MD, PhD

Published in: Clinical Orthopaedics and Related Research® | Issue 10/2012

Abstract

Background

The rotational position of the acetabulum to the pelvis (acetabular tilt) may influence acetabular version and coverage of the femoral head. To date, the pathologic significance of acetabular tilt in hip dysplasia is unknown.

Questions/Purposes

We determined whether acetabular tilt in hip dysplasia is different from that in normal hips and whether this correlates with acetabular version and coverage.

Methods

We measured the acetabular tilt angle on the lateral view of three-dimensional pelvic CT images of 40 patients (72 hips) with hip dysplasia. Forty normal hips from 40 patients were used as controls. The acetabular sector angle was measured as an index for acetabular coverage of the femoral head.

Results

The mean acetabular tilt angle was increased in dysplastic hips compared with controls. In dysplastic hips, a posteriorly rotated acetabulum (increased acetabular tilt) was associated with increased acetabular anteversion and with decreased anterior and anterosuperior acetabular coverage. No correlation was found in controls. In dysplastic hips with a posterior acetabular deficiency, the acetabulum was rotated anteriorly (decreased acetabular tilt) compared with hips with anterior and lateral deficiencies.

Conclusions

We observed a correlation between the rotational position of the acetabulum in the pelvis with acetabular version and coverage in hip dysplasia. Our observations confirmed anterior rotation of the acetabular fragment during periacetabular osteotomies is an anatomically reasonable maneuver for hips with anterolateral acetabular deficiencies, while the maneuver can exacerbate posterior coverage and should be avoided in hips with a posterior acetabular deficiency.

Level of Evidence

Level IV, diagnostic study. See the Guidelines for Authors for a complete description of levels of evidence.

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Title: Acetabular Tilt Correlates with Acetabular Version and Coverage in Hip Dysplasia
Authors: Masanori Fujii, MD, PhD
Yasuharu Nakashima, MD, PhD
Taishi Sato, MD
Mio Akiyama, MD
Yukihide Iwamoto, MD, PhD
Publication date: 01-10-2012
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 10/2012
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-012-2370-z

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Springer Medicine

Acetabular Tilt Correlates with Acetabular Version and Coverage in Hip Dysplasia

Abstract

Background

Questions/Purposes

Methods

Results

Conclusions

Level of Evidence

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Questions/Purposes

Methods

Results

Conclusions

Level of Evidence

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