The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head

A biomechanical study

Nariyuki Mura, Shawn W. O'Driscoll, Mark E. Zobitz, Guido Heers, Thomas R. Jenkyn, Siaw Meng Chou, Andreas M. Halder, Kai Nan An

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Rotator cuff ruptures that extend into the infraspinatus tendon may cause dysfunction and superior migration of the humerus. The purpose of this study was to determine whether a threshold size of infraspinatus defect exists beyond which abduction torque generation decreases and superior migration of the humeral head increases. Glenohumeral abduction torque and superior humeral head translations were measured in hanging arms in neutral rotation in cadaver shoulders (n = 10). Loads were applied to the rotator cuff tendons and the middle deltoid. After sequential detachment of the infraspinatus, abduction torque progressively decreased. At three-fifths detachment, abduction torque was significantly lower than after supraspinatus release alone (52% vs 61%, P < .05). Superior translation after complete supraspinatus and infraspinatus detachment increased significantly (P < .05), but no intermediate threshold was detected. Therefore, the entire infraspinatus contributes to abduction torque generation and stabilizes the humeral head against superior subluxation. Even with a tear extending into the superior infraspinatus, the infraspinatus contributes abduction force generation across the glenohumeral joint.

Original languageEnglish (US)
Pages (from-to)179-184
Number of pages6
JournalJournal of Shoulder and Elbow Surgery
Volume12
Issue number2
DOIs
StatePublished - Mar 2003

Fingerprint

Humeral Head
Rotator Cuff
Torque
Tendons
Shoulder Joint
Humerus
Tears
Cadaver
Rupture
Arm

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

Cite this

The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head : A biomechanical study. / Mura, Nariyuki; O'Driscoll, Shawn W.; Zobitz, Mark E.; Heers, Guido; Jenkyn, Thomas R.; Chou, Siaw Meng; Halder, Andreas M.; An, Kai Nan.

In: Journal of Shoulder and Elbow Surgery, Vol. 12, No. 2, 03.2003, p. 179-184.

Research output: Contribution to journalArticle

Mura, Nariyuki ; O'Driscoll, Shawn W. ; Zobitz, Mark E. ; Heers, Guido ; Jenkyn, Thomas R. ; Chou, Siaw Meng ; Halder, Andreas M. ; An, Kai Nan. / The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head : A biomechanical study. In: Journal of Shoulder and Elbow Surgery. 2003 ; Vol. 12, No. 2. pp. 179-184.
@article{7922271e58ce466a8fa24f36781640fc,
title = "The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head: A biomechanical study",
abstract = "Rotator cuff ruptures that extend into the infraspinatus tendon may cause dysfunction and superior migration of the humerus. The purpose of this study was to determine whether a threshold size of infraspinatus defect exists beyond which abduction torque generation decreases and superior migration of the humeral head increases. Glenohumeral abduction torque and superior humeral head translations were measured in hanging arms in neutral rotation in cadaver shoulders (n = 10). Loads were applied to the rotator cuff tendons and the middle deltoid. After sequential detachment of the infraspinatus, abduction torque progressively decreased. At three-fifths detachment, abduction torque was significantly lower than after supraspinatus release alone (52{\%} vs 61{\%}, P < .05). Superior translation after complete supraspinatus and infraspinatus detachment increased significantly (P < .05), but no intermediate threshold was detected. Therefore, the entire infraspinatus contributes to abduction torque generation and stabilizes the humeral head against superior subluxation. Even with a tear extending into the superior infraspinatus, the infraspinatus contributes abduction force generation across the glenohumeral joint.",
author = "Nariyuki Mura and O'Driscoll, {Shawn W.} and Zobitz, {Mark E.} and Guido Heers and Jenkyn, {Thomas R.} and Chou, {Siaw Meng} and Halder, {Andreas M.} and An, {Kai Nan}",
year = "2003",
month = "3",
doi = "10.1067/mse.2003.9",
language = "English (US)",
volume = "12",
pages = "179--184",
journal = "Journal of Shoulder and Elbow Surgery",
issn = "1058-2746",
publisher = "Mosby Inc.",
number = "2",

}

TY - JOUR

T1 - The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head

T2 - A biomechanical study

AU - Mura, Nariyuki

AU - O'Driscoll, Shawn W.

AU - Zobitz, Mark E.

AU - Heers, Guido

AU - Jenkyn, Thomas R.

AU - Chou, Siaw Meng

AU - Halder, Andreas M.

AU - An, Kai Nan

PY - 2003/3

Y1 - 2003/3

N2 - Rotator cuff ruptures that extend into the infraspinatus tendon may cause dysfunction and superior migration of the humerus. The purpose of this study was to determine whether a threshold size of infraspinatus defect exists beyond which abduction torque generation decreases and superior migration of the humeral head increases. Glenohumeral abduction torque and superior humeral head translations were measured in hanging arms in neutral rotation in cadaver shoulders (n = 10). Loads were applied to the rotator cuff tendons and the middle deltoid. After sequential detachment of the infraspinatus, abduction torque progressively decreased. At three-fifths detachment, abduction torque was significantly lower than after supraspinatus release alone (52% vs 61%, P < .05). Superior translation after complete supraspinatus and infraspinatus detachment increased significantly (P < .05), but no intermediate threshold was detected. Therefore, the entire infraspinatus contributes to abduction torque generation and stabilizes the humeral head against superior subluxation. Even with a tear extending into the superior infraspinatus, the infraspinatus contributes abduction force generation across the glenohumeral joint.

AB - Rotator cuff ruptures that extend into the infraspinatus tendon may cause dysfunction and superior migration of the humerus. The purpose of this study was to determine whether a threshold size of infraspinatus defect exists beyond which abduction torque generation decreases and superior migration of the humeral head increases. Glenohumeral abduction torque and superior humeral head translations were measured in hanging arms in neutral rotation in cadaver shoulders (n = 10). Loads were applied to the rotator cuff tendons and the middle deltoid. After sequential detachment of the infraspinatus, abduction torque progressively decreased. At three-fifths detachment, abduction torque was significantly lower than after supraspinatus release alone (52% vs 61%, P < .05). Superior translation after complete supraspinatus and infraspinatus detachment increased significantly (P < .05), but no intermediate threshold was detected. Therefore, the entire infraspinatus contributes to abduction torque generation and stabilizes the humeral head against superior subluxation. Even with a tear extending into the superior infraspinatus, the infraspinatus contributes abduction force generation across the glenohumeral joint.

UR - http://www.scopus.com/inward/record.url?scp=0037492887&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037492887&partnerID=8YFLogxK

U2 - 10.1067/mse.2003.9

DO - 10.1067/mse.2003.9

M3 - Article

VL - 12

SP - 179

EP - 184

JO - Journal of Shoulder and Elbow Surgery

JF - Journal of Shoulder and Elbow Surgery

SN - 1058-2746

IS - 2

ER -