Affordable Access

Publisher Website

Importance of the subscapularis muscle after total shoulder arthroplasty.

Authors
Journal
Clinical Biomechanics
0268-0033
Publisher
Elsevier
Publication Date
Volume
28
Issue
2
Identifiers
DOI: 10.1016/j.clinbiomech.2012.11.010
Disciplines
  • Computer Science
  • Logic

Abstract

BACKGROUND: The rotator cuff muscles are the main stabilizer of the glenohumeral joint. After total shoulder arthroplasty using anterior approaches, a dysfunction of the subscapularis muscle has been reported. In the present paper we tested the hypothesis that a deficient subscapularis following total shoulder arthroplasty can induce joint instability. METHODS: To test this hypothesis we have developed an EMG-driven musculoskeletal model of the glenohumeral joint. The model was based on an algorithm that minimizes the difference between measured and predicted muscular activities, while satisfying the mechanical equilibrium of the glenohumeral joint. A movement of abduction in the scapular plane was simulated. We compared a normal and deficient subscapularis. Muscle forces, joint force, contact pattern and humeral head translation were evaluated. FINDINGS: To satisfy the mechanical equilibrium, a deficient subscapularis induced a decrease of the force of the infraspinatus muscle. This force decrease was balanced by an increase of the supraspinatus and middle deltoid. As a consequence, the deficient subscapularis induced an upward migration of the humeral head, an eccentric contact pattern and higher stress within the cement. INTERPRETATION: These results confirm the importance of the suscapularis for the long-term stability of total shoulder arthroplasty.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Integrity and function of the subscapularis after...

on Journal of Shoulder and Elbow... Jan 01, 2010

Ultrasound evaluation and clinical correlation of...

on Journal of Shoulder and Elbow... 2006

Ultrasound evaluation and clinical correlation of...

on Journal of Shoulder and Elbow... Jan 01, 2006
More articles like this..