Acetabular development in Legg-Calvé-Perthes disease
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Children with Perthes disease show hip joint abnormalities. Acetabular plasticity decreases after age nine, likely causing poor outcomes in older children with Perthes disease.
Area of Science:
- Pediatric Orthopedics
- Developmental Biology
- Radiology
Background:
- Perthes disease affects proximal femur epiphysis and acetabulum development.
- Unilateral Perthes disease allows for comparison with unaffected contralateral hip.
- Serial radiography is crucial for tracking hip joint changes.
Purpose of the Study:
- To analyze the developmental trajectory of the proximal femur epiphysis and acetabulum in children with unilateral Perthes disease.
- To compare the affected hip with the unaffected side.
- To identify factors contributing to unfavorable outcomes in Perthes disease.
Main Methods:
- Serial X-ray analysis of 50 children with unilateral Perthes disease.
- Assessment of epiphysis and acetabular indices on both affected and unaffected hips.
- Comparative analysis of developmental changes over time.
Main Results:
- Pathological changes were confirmed in the affected hips.
- Femur epiphysis and acetabular development showed parallel pathological progression up to 9-10 years of age.
- Acetabular plasticity significantly reduced after age nine, unlike the femur epiphysis.
Conclusions:
- The acetabulum's limited plastic ability after age nine is a critical factor in Perthes disease progression.
- Reduced acetabular plasticity in older children likely leads to poorer treatment outcomes.
- Understanding these developmental differences is key for managing Perthes disease in different age groups.
Abstract:
The normal development of the proximal femur epiphysis and the acetabulum of 50 children with unilateral Perthes disease were analyzed on the unaffected side with serial x-rays using the epiphysis and the acetabular index. The same factors were studied on the affected side. A pathological process has been established in the affected hip. However, while these pathological processes run parallel up to 9 to 10 years of age on the femur epiphysis and in the acetabulum, the elastic ability of the acetabulum ceases over 9 years of age. This smaller plastic ability is the probable cause of unfavorable results in older children.