The effect of subscapularis muscle contraction on coaptation of anteroinferior glenohumeral ligament–labrum complex after Bankart repair

Yoshiaki Itoigawa, Alexander W. Hooke, John W. Sperling, Scott P. Steinmann, Kristin D Zhao, Eiji Itoi, Kai Nan An

Research output: Contribution to journalArticle

Abstract

Facilitation of healing is important for the anteroinferior glenohumeral ligament–labrum complex (AIGHL-LC) after Bankart repair in shoulder dislocation. The purpose of this study was to investigate the effect of subscapularis muscle loading on contact area and contact pressure between the subscapularis and AIGHL-LC and between the glenoid bone and the AIGHL-LC following Bankart repair. Twenty-two fresh-frozen cadaveric shoulders were used. They were attached to a shoulder-positioning device to which a compression force was applied. Loads applied to the supraspinatus, infraspinatus, and teres minor tendons were held constant. The loads applied to the subscapularis tendon were set at 0, 10, 20, and 30 Newton (N). Contact pressure and area between the subscapularis and the AIGHL-LC were measured with the arm at 4 rotational positions: 60° and 30° internal, neutral, and 30° external. After the Bankart lesion was created, the contact area and pressure between the AIGHL-LC and glenoid bone were measured while Bankart repair was performed with or without loading of the subscapularis. The contact area and pressures with 10, 20, and 30 N of subscapularis loadings were significantly greater than with 0 N of subscapularis loading at 60° internal rotation and 30° external rotation (P <.05). After Bankart repair, contact area and pressure with subscapularis loading between the AIGHL-LC and glenoid bone were significantly greater than without subscapularis loading (P <.01). We conclude that isometric contraction exercises of the subscapularis might facilitate healing of the AIGHL-LC after Bankart repair.

Original languageEnglish (US)
JournalJournal of Biomechanics
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

Rotator Cuff
Muscle Contraction
Muscle
Repair
Bone
Tendons
Pressure
Bone and Bones
Shoulder Dislocation
Bursitis
Isometric Contraction
Arm

Keywords

  • Bankart repair
  • Dislocation
  • Rehabilitation
  • Shoulder
  • Subscapularis

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

Cite this

The effect of subscapularis muscle contraction on coaptation of anteroinferior glenohumeral ligament–labrum complex after Bankart repair. / Itoigawa, Yoshiaki; Hooke, Alexander W.; Sperling, John W.; Steinmann, Scott P.; Zhao, Kristin D; Itoi, Eiji; An, Kai Nan.

In: Journal of Biomechanics, 01.01.2019.

Research output: Contribution to journalArticle

Itoigawa, Yoshiaki ; Hooke, Alexander W. ; Sperling, John W. ; Steinmann, Scott P. ; Zhao, Kristin D ; Itoi, Eiji ; An, Kai Nan. / The effect of subscapularis muscle contraction on coaptation of anteroinferior glenohumeral ligament–labrum complex after Bankart repair. In: Journal of Biomechanics. 2019.
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