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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:
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Related Experiment Video

Updated: Jun 29, 2025

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings
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Full-body Postural Alignment Analysis Through Barycentremetry.

Marc Khalifé1,2,3, Claudio Vergari3, Ayman Assi3,4

  • 1Department of Orthopaedic Surgery, Spine Unit, Hôpital Européen Georges Pompidou, Paris, France.

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|April 4, 2024
PubMed
Summary
This summary is machine-generated.

Center of mass (COM) location correlates with spinal alignment in healthy adults. Increased abdominal volume disrupts spinopelvic alignment, leading to compensatory hip extension.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Radiology

Background:

  • The relationship between center of mass (COM) location and spinopelvic parameters is not well-understood.
  • Understanding postural alignment is crucial for assessing spinal health.

Purpose of the Study:

  • To investigate the correlation between COM locations and global postural alignment parameters in healthy individuals.
  • To assess the impact of increased anterior body envelope-to-spine distance on spinopelvic alignment.

Main Methods:

  • A multicentric retrospective study involving 124 healthy volunteers.
  • Full-body biplanar radiographs were used to estimate COM location and analyze parameters like lumbar lordosis (LL), thoracic kyphosis (TK), and pelvic tilt (PT).
  • Body envelope reconstruction allowed measurement of the distance between the anterior skin and the lumbar apex vertebral body center (SV-L distance).

Main Results:

  • Increased LL correlated with posterior COM translation above the thoracic apex (P=0.002).
  • Increased TK correlated with posterior COM shift at the inflection point (P=0.008).
  • Greater SV-L distance was associated with increased sagittal odontoid-hip axis angle (ODHA) and anterior body COM, influenced by TK and LL, leading to increased sacro-femoral angle (SFA).

Conclusions:

  • Barycentremetry reveals associations between COM shifts and spinal curvatures (LL, TK).
  • Whole-body COM strongly correlates with ODHA.
  • Increased abdominal volume significantly disrupts spinopelvic alignment, necessitating compensatory hip extension.