Abduction moment arms of rotator cuff tendons and deltoid muscles after acromioplasty and coracoacromial ligament section

T. Nakajima, J. Liu, Kai Nan An

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Scientifically, it has been questioned if the coracoacromial ligament has a significant role of serving as a pulley for the supraspinatus tendon. The purpose of this study was to examine the changes of abduction moment arms of the rotator cuff and deltoid muscle after anterior acromioplasty. In normal condition and after sectioning of the coracoacromial ligament and acromioplasty, abduction moment arms of four cuff tendons and three portions of the deltoid were obtained with four cadaver shoulders by computing the slope of the tendon excursion versus the glenohumeral abduction angle curve using a magnetic tracking device. In intact joints, the abduction moment arms of the supraspinatus increased from 20 mm to 27 mm with the arm abducted from 0° to 30°, which showed a better condition of the glenohumeral abduction. Then, they decreased to 23 mm with arm in 60° abduction. After sectioning of the coracoacromial ligament and acromioplasty less than 4 mm thick, the abduction moment arms of supraspinatus did not increase. This finding suggested that the coracoacromial ligament and acromion, anatomically, did not serve as pulleys for the supraspinatus tendon. However, the abduction moment arm of the middle deltoid decreased after an acromioplasty.

Original languageEnglish (US)
Pages (from-to)147-156
Number of pages10
JournalJournal of Musculoskeletal Research
Volume6
Issue number3-4
StatePublished - Sep 2002

Fingerprint

Acromioclavicular Joint
Deltoid Muscle
Rotator Cuff
Tendons
Arm
Acromion
Cadaver
Joints
Equipment and Supplies

Keywords

  • Anterior acromioplasty
  • Coracoacromial ligament
  • Moment arm
  • Rotator cuff
  • Rotator cuff tear

ASJC Scopus subject areas

  • Surgery

Cite this

Abduction moment arms of rotator cuff tendons and deltoid muscles after acromioplasty and coracoacromial ligament section. / Nakajima, T.; Liu, J.; An, Kai Nan.

In: Journal of Musculoskeletal Research, Vol. 6, No. 3-4, 09.2002, p. 147-156.

Research output: Contribution to journalArticle

@article{6cf931cd403e44ef8cc60e07469720fe,
title = "Abduction moment arms of rotator cuff tendons and deltoid muscles after acromioplasty and coracoacromial ligament section",
abstract = "Scientifically, it has been questioned if the coracoacromial ligament has a significant role of serving as a pulley for the supraspinatus tendon. The purpose of this study was to examine the changes of abduction moment arms of the rotator cuff and deltoid muscle after anterior acromioplasty. In normal condition and after sectioning of the coracoacromial ligament and acromioplasty, abduction moment arms of four cuff tendons and three portions of the deltoid were obtained with four cadaver shoulders by computing the slope of the tendon excursion versus the glenohumeral abduction angle curve using a magnetic tracking device. In intact joints, the abduction moment arms of the supraspinatus increased from 20 mm to 27 mm with the arm abducted from 0° to 30°, which showed a better condition of the glenohumeral abduction. Then, they decreased to 23 mm with arm in 60° abduction. After sectioning of the coracoacromial ligament and acromioplasty less than 4 mm thick, the abduction moment arms of supraspinatus did not increase. This finding suggested that the coracoacromial ligament and acromion, anatomically, did not serve as pulleys for the supraspinatus tendon. However, the abduction moment arm of the middle deltoid decreased after an acromioplasty.",
keywords = "Anterior acromioplasty, Coracoacromial ligament, Moment arm, Rotator cuff, Rotator cuff tear",
author = "T. Nakajima and J. Liu and An, {Kai Nan}",
year = "2002",
month = "9",
language = "English (US)",
volume = "6",
pages = "147--156",
journal = "Journal of Musculoskeletal Research",
issn = "0218-9577",
publisher = "World Scientific Publishing Co. Pte Ltd",
number = "3-4",

}

TY - JOUR

T1 - Abduction moment arms of rotator cuff tendons and deltoid muscles after acromioplasty and coracoacromial ligament section

AU - Nakajima, T.

AU - Liu, J.

AU - An, Kai Nan

PY - 2002/9

Y1 - 2002/9

N2 - Scientifically, it has been questioned if the coracoacromial ligament has a significant role of serving as a pulley for the supraspinatus tendon. The purpose of this study was to examine the changes of abduction moment arms of the rotator cuff and deltoid muscle after anterior acromioplasty. In normal condition and after sectioning of the coracoacromial ligament and acromioplasty, abduction moment arms of four cuff tendons and three portions of the deltoid were obtained with four cadaver shoulders by computing the slope of the tendon excursion versus the glenohumeral abduction angle curve using a magnetic tracking device. In intact joints, the abduction moment arms of the supraspinatus increased from 20 mm to 27 mm with the arm abducted from 0° to 30°, which showed a better condition of the glenohumeral abduction. Then, they decreased to 23 mm with arm in 60° abduction. After sectioning of the coracoacromial ligament and acromioplasty less than 4 mm thick, the abduction moment arms of supraspinatus did not increase. This finding suggested that the coracoacromial ligament and acromion, anatomically, did not serve as pulleys for the supraspinatus tendon. However, the abduction moment arm of the middle deltoid decreased after an acromioplasty.

AB - Scientifically, it has been questioned if the coracoacromial ligament has a significant role of serving as a pulley for the supraspinatus tendon. The purpose of this study was to examine the changes of abduction moment arms of the rotator cuff and deltoid muscle after anterior acromioplasty. In normal condition and after sectioning of the coracoacromial ligament and acromioplasty, abduction moment arms of four cuff tendons and three portions of the deltoid were obtained with four cadaver shoulders by computing the slope of the tendon excursion versus the glenohumeral abduction angle curve using a magnetic tracking device. In intact joints, the abduction moment arms of the supraspinatus increased from 20 mm to 27 mm with the arm abducted from 0° to 30°, which showed a better condition of the glenohumeral abduction. Then, they decreased to 23 mm with arm in 60° abduction. After sectioning of the coracoacromial ligament and acromioplasty less than 4 mm thick, the abduction moment arms of supraspinatus did not increase. This finding suggested that the coracoacromial ligament and acromion, anatomically, did not serve as pulleys for the supraspinatus tendon. However, the abduction moment arm of the middle deltoid decreased after an acromioplasty.

KW - Anterior acromioplasty

KW - Coracoacromial ligament

KW - Moment arm

KW - Rotator cuff

KW - Rotator cuff tear

UR - http://www.scopus.com/inward/record.url?scp=0036769902&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036769902&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0036769902

VL - 6

SP - 147

EP - 156

JO - Journal of Musculoskeletal Research

JF - Journal of Musculoskeletal Research

SN - 0218-9577

IS - 3-4

ER -