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Related Experiment Video

Updated: May 13, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Published on: February 10, 2015

Acromioclavicular joint ligamentous system contributing to clavicular strut function: a cadaveric study.

Satoshi Oki¹, Noboru Matsumura, Wataru Iwamoto

¹Department of Orthopedic Surgery, School of Medicine, Keio University, Tokyo, Japan.

Journal of Shoulder and Elbow Surgery

|March 21, 2013

Summary

In acromioclavicular (AC) joint separation, the clavicle overrides the acromion during internal shoulder rotation. This clavicular overriding and altered scapular motion can cause AC joint dysfunction.

Keywords:

Acromioclavicular joint Basic Science Study Cadaver Model Kinematics biomechanics cadaver study coracoclavicular ligament dislocation

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Rat Model of Adhesive Capsulitis of the Shoulder

Rat Model of Adhesive Capsulitis of the Shoulder

Published on: September 28, 2018

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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

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Published on: February 10, 2015

Rat Model of Adhesive Capsulitis of the Shoulder

Rat Model of Adhesive Capsulitis of the Shoulder

Published on: September 28, 2018

Area of Science:

Orthopedic biomechanics
Shoulder kinematics
Anatomy and physiology

Background:

Acromioclavicular (AC) joint separation can lead to shoulder dysfunction.
The precise 3D kinematics of the clavicle and scapula after AC joint injury are not fully understood.

Purpose of the Study:

To investigate the 3D clavicular and scapular kinematics during specific shoulder motions in AC joint separation models.
To test the hypothesis that clavicular overriding of the acromion occurs in symptomatic AC joint separation.

Main Methods:

Utilized 10 cadaveric shoulders, measuring intact and AC joint separated models.
Employed an electromagnetic tracking device to record 3D scapular and clavicular motion.
Assessed kinematics during shoulder abduction in neutral and internal humeral rotation.

Main Results:

Complete clavicular overriding of the acromion occurred in all AC separation models during abduction with internal rotation.
Ligament sectioning led to increased upward clavicular rotation and decreased posterior clavicular rotation.
Scapular upward rotation and posterior tilt significantly decreased during abduction with internal rotation in AC separation models.

Conclusions:

Acromioclavicular joint separation significantly alters scapular and clavicular kinematics.
Abduction with internal rotation in AC separation models leads to decreased scapular posterior tilt and upward rotation.
These kinematic changes may result in acromioclavicular joint articulation dysfunction.