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Femoral morphology differs between deficient and excessive acetabular coverage
S D Steppacher1, M Tannast, S Werlen
1Department of Orthopaedic Surgery, Inselspital, University of Bern, Murtenstrasse, 3010, Bern, Switzerland.
Clinical Orthopaedics and Related Research
|February 22, 2008
Summary
Acetabular coverage significantly influences proximal femoral shape. Deep acetabulums correlate with spherical femoral heads, while hip dysplasia is linked to elliptical heads, impacting joint congruity.
Area of Science:
- Orthopedic surgery
- Developmental biology
- Radiology
Background:
- Acetabular shape variations are linked to femoral head deformities like Legg-Calvé-Perthes disease.
- The influence of acetabular coverage on proximal femoral morphology remains unclear.
Purpose of the Study:
- To investigate whether acetabular coverage influences proximal femoral morphology.
- To compare femoral anatomy in hips with developmental dysplasia versus deep acetabulums.
Main Methods:
- Retrospective comparative study of 50 hips with developmental dysplasia and 50 hips with deep acetabulums.
- MRI arthrography used to measure femoral head sphericity, epiphyseal shape, epiphyseal extension, and head-neck offset.
Main Results:
- Deep acetabulums were associated with more spherical femoral heads, increased epiphyseal height, and greater head-neck offset.
- Dysplastic hips showed elliptical femoral heads, decreased epiphyseal height, and reduced head-neck offset.
Conclusions:
- Significant differences in proximal femoral anatomy exist between hips with varying acetabular coverage.
- Nonspherical femoral heads in dysplastic hips may lead to incongruity after surgical correction.
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