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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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...
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Related Experiment Video

Updated: Jul 25, 2025

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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ASD with high pelvic retroversion develop changes in their acetabular orientation during walking.

Ayman Assi1,2, Guillaume Rebeyrat2, Rami El Rachkidi1

  • 1Laboratory of Biomechanics and Medical Imaging, Faculty of Medicine, Saint-Joseph University of Beirut, Beirut, Lebanon.

Brain & Spine
|June 29, 2023
PubMed
Summary

Adult Spinal Deformity (ASD) patients with severe pelvic retroversion exhibit altered hip joint orientation during walking. This dynamic change in acetabular orientation is linked to the development of hip osteoarthritis.

Keywords:
Adult spinal deformityBiomechanicsGait analysisHipSpine

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Spine Surgery

Background:

  • Adult Spinal Deformity (ASD) is associated with pelvic retroversion.
  • Pelvic retroversion may increase hip loading, contributing to hip-spine syndrome.

Purpose of the Study:

  • To investigate how pelvic retroversion modifies acetabular orientation in ASD patients during walking.
  • To explore the relationship between dynamic acetabular orientation and hip osteoarthritis in ASD.

Main Methods:

  • 89 ASD patients and 37 controls underwent 3D gait analysis and full-body biplanar X-rays.
  • Calculated static and dynamic spinopelvic and acetabular parameters during walking.
  • Grouped ASD patients based on high pelvic tilt (PT) for comparison.

Main Results:

  • ASD patients with high PT showed significantly more severe postural malalignment.
  • High PT group exhibited greater dynamic pelvic retroversion during gait.
  • Increased acetabular anteversion, external coverage, and decreased anterior coverage were observed in ASD-highPT during walking.

Conclusions:

  • Severe pelvic retroversion in ASD alters dynamic acetabular orientation during gait.
  • These gait-related acetabular changes are associated with hip osteoarthritis in ASD patients.