Dynamic contributions to superior shoulder stability

A. M. Halder, Kristin D Zhao, S. W. O'Driscoll, B. F. Morrey, K. N. An

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

It has been suggested that superior decentralization of the humeral head is a mechanical factor in the etiology of degenerative rotator cuff tears. This superior decentralization may be caused by muscular imbalance. The objective of this study was to investigate the contribution of individual shoulder muscles to superior stability of the glenohumeral joint. In 10 fresh frozen cadaver shoulders the tendons of the rotator cuff, teres major, latissimus, pectoralis major, deltoid and biceps were prepared. The shoulders were tested in a shoulder-loading device in 0°, 30°, 60°, and 90° of glenohumeral abduction. A constant superior force of 20 N was applied to the humerus. Tensile loads were applied sequentially to the tendons in proportion to their cross-sectional areas and translations of the humeral head relative to the glenoid were recorded with a 3Space™ Fastrak system. Depression of the humeral head was most effectively achieved by the latissimus (5.6 ± 2.2 mm) and the teres major (5.1 ± 2.0 mm). Further studies should elucidate their possible in vivo role in the frontal plane force couple to counter balance the deltoid. The infraspinatus (4.6 ± 2.0 mm) and subscapularis (4.7 ± 1.9 mm) showed similar effects while the supraspinatus (2.0 ± 1.4 mm) was less effective in depression. Therefore, the infraspinatus and subscapularis should be surgically repaired whenever possible. The supraspinatus may be of less importance for superior stability than previously assumed. Published by Elsevier Science Ltd on behalf of Orthopaedic Research Society.

Original languageEnglish (US)
Pages (from-to)206-212
Number of pages7
JournalJournal of Orthopaedic Research
Volume19
Issue number2
DOIs
StatePublished - 2001

Fingerprint

Rotator Cuff
Humeral Head
Politics
Tendons
Bursitis
Shoulder Joint
Humerus
Cadaver
Equipment and Supplies
Muscles

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Dynamic contributions to superior shoulder stability. / Halder, A. M.; Zhao, Kristin D; O'Driscoll, S. W.; Morrey, B. F.; An, K. N.

In: Journal of Orthopaedic Research, Vol. 19, No. 2, 2001, p. 206-212.

Research output: Contribution to journalArticle

Halder, A. M. ; Zhao, Kristin D ; O'Driscoll, S. W. ; Morrey, B. F. ; An, K. N. / Dynamic contributions to superior shoulder stability. In: Journal of Orthopaedic Research. 2001 ; Vol. 19, No. 2. pp. 206-212.
@article{486846c79eb8458aab266f88ae859c0a,
title = "Dynamic contributions to superior shoulder stability",
abstract = "It has been suggested that superior decentralization of the humeral head is a mechanical factor in the etiology of degenerative rotator cuff tears. This superior decentralization may be caused by muscular imbalance. The objective of this study was to investigate the contribution of individual shoulder muscles to superior stability of the glenohumeral joint. In 10 fresh frozen cadaver shoulders the tendons of the rotator cuff, teres major, latissimus, pectoralis major, deltoid and biceps were prepared. The shoulders were tested in a shoulder-loading device in 0°, 30°, 60°, and 90° of glenohumeral abduction. A constant superior force of 20 N was applied to the humerus. Tensile loads were applied sequentially to the tendons in proportion to their cross-sectional areas and translations of the humeral head relative to the glenoid were recorded with a 3Space™ Fastrak system. Depression of the humeral head was most effectively achieved by the latissimus (5.6 ± 2.2 mm) and the teres major (5.1 ± 2.0 mm). Further studies should elucidate their possible in vivo role in the frontal plane force couple to counter balance the deltoid. The infraspinatus (4.6 ± 2.0 mm) and subscapularis (4.7 ± 1.9 mm) showed similar effects while the supraspinatus (2.0 ± 1.4 mm) was less effective in depression. Therefore, the infraspinatus and subscapularis should be surgically repaired whenever possible. The supraspinatus may be of less importance for superior stability than previously assumed. Published by Elsevier Science Ltd on behalf of Orthopaedic Research Society.",
author = "Halder, {A. M.} and Zhao, {Kristin D} and O'Driscoll, {S. W.} and Morrey, {B. F.} and An, {K. N.}",
year = "2001",
doi = "10.1016/S0736-0266(00)00028-0",
language = "English (US)",
volume = "19",
pages = "206--212",
journal = "Journal of Orthopaedic Research",
issn = "0736-0266",
publisher = "John Wiley and Sons Inc.",
number = "2",

}

TY - JOUR

T1 - Dynamic contributions to superior shoulder stability

AU - Halder, A. M.

AU - Zhao, Kristin D

AU - O'Driscoll, S. W.

AU - Morrey, B. F.

AU - An, K. N.

PY - 2001

Y1 - 2001

N2 - It has been suggested that superior decentralization of the humeral head is a mechanical factor in the etiology of degenerative rotator cuff tears. This superior decentralization may be caused by muscular imbalance. The objective of this study was to investigate the contribution of individual shoulder muscles to superior stability of the glenohumeral joint. In 10 fresh frozen cadaver shoulders the tendons of the rotator cuff, teres major, latissimus, pectoralis major, deltoid and biceps were prepared. The shoulders were tested in a shoulder-loading device in 0°, 30°, 60°, and 90° of glenohumeral abduction. A constant superior force of 20 N was applied to the humerus. Tensile loads were applied sequentially to the tendons in proportion to their cross-sectional areas and translations of the humeral head relative to the glenoid were recorded with a 3Space™ Fastrak system. Depression of the humeral head was most effectively achieved by the latissimus (5.6 ± 2.2 mm) and the teres major (5.1 ± 2.0 mm). Further studies should elucidate their possible in vivo role in the frontal plane force couple to counter balance the deltoid. The infraspinatus (4.6 ± 2.0 mm) and subscapularis (4.7 ± 1.9 mm) showed similar effects while the supraspinatus (2.0 ± 1.4 mm) was less effective in depression. Therefore, the infraspinatus and subscapularis should be surgically repaired whenever possible. The supraspinatus may be of less importance for superior stability than previously assumed. Published by Elsevier Science Ltd on behalf of Orthopaedic Research Society.

AB - It has been suggested that superior decentralization of the humeral head is a mechanical factor in the etiology of degenerative rotator cuff tears. This superior decentralization may be caused by muscular imbalance. The objective of this study was to investigate the contribution of individual shoulder muscles to superior stability of the glenohumeral joint. In 10 fresh frozen cadaver shoulders the tendons of the rotator cuff, teres major, latissimus, pectoralis major, deltoid and biceps were prepared. The shoulders were tested in a shoulder-loading device in 0°, 30°, 60°, and 90° of glenohumeral abduction. A constant superior force of 20 N was applied to the humerus. Tensile loads were applied sequentially to the tendons in proportion to their cross-sectional areas and translations of the humeral head relative to the glenoid were recorded with a 3Space™ Fastrak system. Depression of the humeral head was most effectively achieved by the latissimus (5.6 ± 2.2 mm) and the teres major (5.1 ± 2.0 mm). Further studies should elucidate their possible in vivo role in the frontal plane force couple to counter balance the deltoid. The infraspinatus (4.6 ± 2.0 mm) and subscapularis (4.7 ± 1.9 mm) showed similar effects while the supraspinatus (2.0 ± 1.4 mm) was less effective in depression. Therefore, the infraspinatus and subscapularis should be surgically repaired whenever possible. The supraspinatus may be of less importance for superior stability than previously assumed. Published by Elsevier Science Ltd on behalf of Orthopaedic Research Society.

UR - http://www.scopus.com/inward/record.url?scp=0035060671&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035060671&partnerID=8YFLogxK

U2 - 10.1016/S0736-0266(00)00028-0

DO - 10.1016/S0736-0266(00)00028-0

M3 - Article

C2 - 11347692

AN - SCOPUS:0035060671

VL - 19

SP - 206

EP - 212

JO - Journal of Orthopaedic Research

JF - Journal of Orthopaedic Research

SN - 0736-0266

IS - 2

ER -