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Normal development of the hip: a geometrical analysis based on planimetric radiography
Christof Birkenmaier1, Gabriele Jorysz, Volkmar Jansson
1Department of Orthopedic Surgery, Grosshadern Medical Center, University of Munich, Munich, Germany. doctor-b@web.de
Journal of Pediatric Orthopedics. Part B
|October 16, 2009
Summary
This study reveals how the hip joint
Area of Science:
- Orthopedics
- Pediatric Orthopedics
- Developmental Biology
Background:
- Existing research often isolates acetabular or proximal femur development.
- A comprehensive understanding of their parallel growth is crucial for pediatric hip conditions.
Purpose of the Study:
- To investigate the concurrent geometrical development of the proximal femur and acetabulum during childhood and adolescence.
- To correlate changes in angles and lever arms with skeletal growth.
Main Methods:
- Analysis of 675 hip joints from individuals aged 9 months to 16 years.
- Utilized planimetric radiography to determine angles and lever arms.
- Correlated geometrical parameters with age and skeletal maturity.
Main Results:
- Apophyseal angles remain stable; epiphyseal and neck-shaft angles change until age 10.
- Acetabular coverage and alignment continue developing until skeletal maturity.
- Load and muscle lever arms increase, with a constant ratio post-age 10.
Conclusions:
- Presents correlated data on proximal femur and acetabular geometrical development.
- Findings support timing corrective osteotomies for the proximal femur after age 10.
- Acknowledges limitations due to the two-dimensional nature of radiography.
