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Related Experiment Video

Updated: Jul 7, 2026

Longitudinal Micro-Computed Tomography Image Analysis for User-Defined Region of Interest in Critical-Sized Bone Defects

Longitudinal Micro-Computed Tomography Image Analysis for User-Defined Region of Interest in Critical-Sized Bone Defects

Published on: June 24, 2025

Computed tomography study of radial head morphology.

John M Itamura¹, Nikolaos T Roidis, Albert K Chong

¹Department of Othopaedics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.

Journal of Shoulder and Elbow Surgery

|February 6, 2008

Summary

The radial head can become uncovered, especially at the radial lip. Elbow joint congruency varies with forearm position, guiding prosthesis sizing for optimal fit.

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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

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Published on: March 12, 2021

Area of Science:

Orthopedic surgery
Biomechanics
Anatomy

Background:

Understanding elbow joint articulation is crucial for orthopedic procedures.
Computed tomography (CT) provides detailed anatomical insights.

Purpose of the Study:

To analyze elbow joint congruency in different forearm positions.
To identify key articulation points for prosthesis trial sizing.

Main Methods:

CT scans of 22 cadaveric adult elbows were acquired.
Forearm positions included full supination, neutral, and full pronation.
Multivariate analysis of variance (MANOVA) assessed joint congruency.

Main Results:

The radial head tended to be uncovered at the radial lip (P < .001).
The radiocapitellar joint demonstrated greater tightness in pronation versus supination (P = .001).
The proximal radioulnar joint showed maximal congruency in its middle portion, particularly posteriorly (P < .001), with 69-79 degrees of coverage.

Conclusions:

Prosthesis trial sizing should consider the ulnar lip/trough of the radiocapitellar joint in pronation.
Posterior or mid-portions of the middle proximal radioulnar joint are critical for congruency.
Optimizing prosthesis fit requires understanding positional joint stability.