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Related Experiment Video

Updated: Nov 25, 2025

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Three-dimensional Capsular Volume Measurements in Multidirectional Shoulder Instability.

Yong Cheol Jun1, Young Lae Moon1, Moustafa I Elsayed2

  • 1Department of Orthopedic Surgery, Chosun University Hospital, Gwangju, Korea.

Clinics in Shoulder and Elbow
|December 17, 2020
PubMed
Summary
This summary is machine-generated.

Enlarged shoulder capsule volume is linked to multidirectional instability (MDI). This study used 3D magnetic resonance arthrography to measure capsular volume, finding a significantly higher ratio in MDI patients compared to controls.

Keywords:
Capsular volumeMultidirectional instabilityShoulder

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • Previous studies indicated differences in capsular volume between controls and patients with shoulder instability using 2D measurements.
  • Two-dimensional cross-sectional areas limited the accuracy of previous capsular volume quantifications.

Purpose of the Study:

  • To investigate the correlation between three-dimensional (3D) capsular volumes and multidirectional instability (MDI) of the shoulder.
  • To utilize magnetic resonance arthrography (MRA) for precise 3D capsular volume measurements.

Main Methods:

  • Retrospective review of MRAs from 21 MDI patients and 16 controls.
  • 3D reconstruction of capsular volumes using Mimics software from MRA data.
  • Calculation of the ratio between 3D capsular volume and glenoid surface area.

Main Results:

  • The ratio of 3D capsular volume to glenoid surface area was significantly higher in the MDI group (3.59 ± 0.83 cm³/cm²) compared to the control group (2.53 ± 0.62 cm²/cm²).
  • A statistically significant difference (p<0.01) was observed between the MDI and control groups.

Conclusions:

  • Capsular volume enlargement is a significant factor in the development of MDI of the shoulder.
  • 3D volume measurement provides a more accurate assessment of capsular changes related to shoulder instability.