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Acetabular tilt correlates with acetabular version and coverage in hip dysplasia
Masanori Fujii1, Yasuharu Nakashima, Taishi Sato
1Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Clinical Orthopaedics and Related Research
|May 1, 2012
Summary
Acetabular tilt, the rotational position of the hip socket, is altered in hip dysplasia. Increased tilt correlates with poorer acetabular version and coverage, impacting surgical decisions.
Area of Science:
- Orthopedic surgery
- Radiology
- Biomechanical engineering
Background:
- Acetabular tilt, the rotational position of the acetabulum, may affect acetabular version and femoral head coverage.
- The pathological significance of acetabular tilt in hip dysplasia remains unclear.
Purpose of the Study:
- To determine if acetabular tilt differs between hips with dysplasia and normal hips.
- To investigate the correlation between acetabular tilt, acetabular version, and acetabular coverage in hip dysplasia.
Main Methods:
- Three-dimensional pelvic CT scans of 40 patients with hip dysplasia (72 hips) and 40 controls were analyzed.
- Acetabular tilt angle and acetabular sector angle (for coverage) were measured.
- Correlation analysis was performed between these parameters.
Main Results:
- Acetabular tilt angle was significantly increased in dysplastic hips compared to controls.
- In dysplastic hips, increased acetabular tilt correlated with increased acetabular anteversion and reduced anterior/anterosuperior coverage.
- Acetabular rotation differed based on the type of acetabular deficiency.
Conclusions:
- A significant correlation exists between acetabular tilt, version, and coverage in hip dysplasia.
- Anterior rotation of the acetabular fragment is suitable for anterolateral deficiencies but should be avoided in posterior deficiencies.
- Understanding acetabular tilt aids in planning periacetabular osteotomies for hip dysplasia.
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