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Acetabular posterior wall morphology. A CT-based method to distinguish two acetabular posterior wall types
Tilman Graulich1, Pascal Graeff1, Stine Nicolaides1
1Trauma Department, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.
Journal of Orthopaedics
|February 7, 2020
Summary
Researchers identified two distinct acetabular types based on posterior wall anatomy. The posterior acetabular sector angle differs significantly between types, aiding in morphological classification.
Area of Science:
- Orthopedic anatomy
- Radiological morphology
Background:
- Posterior acetabular wall anatomy is crucial for hip joint stability.
- Variations in posterior acetabular morphology may impact hip stability.
Purpose of the Study:
- To investigate and differentiate morphological types of the posterior acetabular wall.
- To establish reference values for classifying posterior acetabular anatomy.
Main Methods:
- Analysis of lateral 3D pelvic CT reconstructions to identify acetabular types.
- Determination of acetabular angles using axial CT images.
Main Results:
- Two acetabular types were identified: 35 of Type I and 61 of Type II.
- Posterior acetabular sector angle measured 114° in Type I and 94° in Type II (p < 0.01).
- A 100° cut-off angle effectively predicted acetabular type.
Conclusions:
- Distinct reference values for the posterior acetabular wall were established.
- These values allow for the differentiation of two primary acetabular morphological types.
