Related Experiment Video
Updated: Apr 21, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
How do acetabular version and femoral head coverage change with skeletal maturity?
Andreas M Hingsammer1, Sarah Bixby, David Zurakowski
1Department of Orthopaedic Surgery, University Hospital Balgrist, Zurich, Switzerland.
Acetabular version and sector angles increase with skeletal maturity due to posterior wall growth in pediatric patients. This finding has implications for understanding and treating conditions like pincer-type impingement.
Area of Science:
- Pediatric orthopedics
- Skeletal development
- Hip biomechanics
Background:
- Normal acetabular version development is not well-defined.
- Acetabular retroversion is linked to hip pathologies.
Purpose of the Study:
- Characterize acetabular version and sector angles in pediatric patients.
- Determine sex-based variations in these parameters during development.
Main Methods:
- CT imaging of 200 hips in 100 pediatric patients (9-18 years).
- Stratification by triradiate physis status and sex.
- Measurement of acetabular anteversion and sector angles at various planes.
Main Results:
- Acetabular anteversion increases with skeletal maturity (closed vs. open physis) and with caudal progression.
- Mean anteversion angles were 15-19° in girls and 14-19° in boys, increasing with maturity.
- Acetabular sector angles were greater in the closed physis group, particularly in the posterosuperior plane for males.
Conclusions:
- Acetabular anteversion and sector angles increase with skeletal maturity due to posterior wall growth.
- Radiographic acetabular retroversion may result from insufficient posterior wall growth, not anterior wall overgrowth.
- Findings have clinical implications for treating pincer-type impingement.
More Related Videos
09:51The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
09:31Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Related Concept Videos
Changes in the Appendicular Skeleton with Age
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Bones of the Lower Limb: Femur and Patella
Bone Formation by Intramembranous Ossification
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
Introduction to the Skeletal System
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
Cartilage, a semi-rigid connective tissue found in regions such as...
Bone Formation by Endochondral Ossification
Bones of the Lower Limb: Tibia and Fibula