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Related Experiment Video

Updated: Aug 29, 2025

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

A ratio estimating glenoid bone loss.

Evan S Lederman¹, Anup A Shah²

¹Banner Health, University of Arizona College of Medicine, Orthopedic Sports Medicine Institute, Phoenix, AZ, USA.

JSES International

|September 9, 2022

Summary

This summary is machine-generated.

Estimating glenoid bone loss in shoulder instability is simplified with a new ratio. This method uses glenoid height and defect length to calculate bone loss, aiding clinical assessment.

Keywords:

Bone loss Glenoid Instability Ratio Shoulder surgery Surgical technique

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Area of Science:

Orthopedic surgery
Biomechanics
Medical imaging

Background:

Assessing glenoid bone loss in shoulder instability is clinically challenging.
Glenoid bone defects due to instability alter the normal curvature, forming a geometric chord.
Existing methods for quantifying bone loss can be complex.

Purpose of the Study:

To introduce a straightforward derived ratio for estimating glenoid bone loss.
To provide a simple, accessible method for surgeons evaluating shoulder instability.

Main Methods:

The study assumes the lower glenoid is circular with a proportional height-to-diameter relationship.
Measurements required are glenoid height and the length of the glenoid defect (chord).
A derived ratio is calculated using these two measurements.

Main Results:

A ratio of 0.5 (defect length to glenoid height) corresponds to an estimated 12% glenoid bone loss.
The derived ratio provides a quantitative estimate based on simple geometric principles.

Conclusions:

Glenoid bone loss can be reliably estimated using a simple ratio.
This method aids in the assessment of shoulder instability by quantifying bone loss.