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Three-dimensional anatomy of the hip in osteoarthritis after developmental dysplasia
J-N Argenson1, E Ryembault, X Flecher
1Aix-Marseille University, Marseille, France.
Insights
Developmental dysplasia of the hip (DDH) in Caucasian adults with osteoarthritis shows distinct femoral canal morphology. These findings confirm previous observations in Asian populations.
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging
Background:
- Osteoarthritis secondary to developmental dysplasia of the hip (DDH) presents unique morphological challenges.
- Previous studies on DDH morphology were largely confined to Asian populations.
Purpose of the Study:
- To investigate and characterize the specific hip morphology in Caucasian adults with osteoarthritis secondary to DDH.
- To compare these findings with a control group and previously published data.
Main Methods:
- Radiography and computed tomography (CT) were used to examine the morphology of 83 hips in 69 Caucasian adults with DDH.
- A control group of 310 hips with primary osteoarthritis was included for comparison.
- Hips were classified using the Crowe classification system.
Main Results:
- Intramedullary femoral canals showed reduced mediolateral and anteroposterior dimensions in all DDH groups compared to controls.
- Increased femoral neck-shaft angle was observed specifically in Crowe class II hips.
- Proximal femur anteversion was increased across all DDH groups (2-80 degrees).
- Acetabular dimension measurements by radiography closely correlated with CT measurements.
Conclusions:
- The study confirms that specific femoral morphology alterations observed in Japanese populations with DDH secondary osteoarthritis are also present in Caucasian adults.
- Findings highlight the consistent morphological characteristics of DDH across different ethnic groups.
- Standardized radiographic measurements of acetabular dimensions are reliable and comparable to CT-based measurements.
Abstract:
Using radiography and computer tomography (CT) we studied the morphology of 83 hips in 69 Caucasian adults with osteoarthritis secondary to developmental dysplasia of the hip (DDH). A previously published series of 310 hips with primary osteoarthritis was used as a control group. According to the Crowe classification, 33 of the dysplastic hips were graded as class I, 27 as class II and 23 as class III or class IV. The intramedullary femoral canal had reduced mediolateral and anteroposterior dimensions in all groups compared with the control group. Only in Crowe class II hips was the femoral neck-shaft angle increased. The proximal femur had more anteversion in all the developmental dysplasia of the hip groups, ranging from 2 degrees to 80 degrees. Templated measurement of acetabular dimensions for plain radiography closely matched measurements taken by CT. The results of our study confirm the observations previously confined to the Japanese population.
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