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Pelvic deformity influences acetabular version and coverage in hip dysplasia
Masanori Fujii1, Yasuharu Nakashima, Taishi Sato
1Department of Orthopaedic Surgery, Graduate School of Medical Science, Kyushu University, 3-1-1 Maidashi Higashi-ku, Fukuoka 812-8582, Japan.
Developmental dysplasia of the hip (DDH) involves pelvic bone rotation, impacting acetabular version and coverage. These findings suggest DDH abnormalities affect the entire pelvis, not just the hip joint.
Area of Science:
- Orthopedics
- Radiology
- Developmental Biology
Background:
- Acetabular deformities in developmental dysplasia of the hip (DDH) are known, but pelvic morphology in DDH is poorly understood.
- The relationship between overall pelvic shape and acetabular deformity in DDH remains unclear.
Purpose of the Study:
- To investigate rotational deformities of the entire innominate bone in DDH.
- To determine if innominate bone rotation correlates with acetabular version and coverage.
Main Methods:
- Computed tomography (CT) scans of 50 patients with DDH (82 hips) and 40 normal hips were analyzed.
- Innominate rotation angles were measured at three axial planes.
- Acetabular version and coverage (acetabular sector angle) were evaluated for associations with innominate rotation.
Main Results:
- Patients with DDH exhibited significantly greater internal rotation of the innominate bone compared to controls.
- Internal innominate rotation correlated with increased acetabular anteversion and inclination angles.
- External innominate rotation was observed in cases of acetabular retroversion, and internal rotation was linked to reduced anterior and superior acetabular coverage.
Conclusions:
- Structural abnormalities are present throughout the pelvis in individuals with DDH.
- Acetabular morphology in DDH is influenced by the overall pelvic structure, not solely by local dysplasia.
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