Effects of biceps loading and arm rotation on the superior labrum in the cadaveric shoulder

Rabindra L. Pradhan, Eiji Itoi, Tadato Kido, Yuji Hatakeyama, Masakazu Urayama, Kozo Sato

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Effects of loading the long head of the biceps brachii (LHB) and arm rotation on the strain of the superior labrum (anterior and posterior) in 10 fresh frozen cadaveric shoulder joints were studied. Loads were applied to the rotator cuff muscles to stabilize the humeral head. The strain of the anterior and posterior portions of the labrum with the biceps loaded with 0.42kg, 1.36kg, and 2.31kg were measured using linear transducers. The humerus was rotated externally (30, 45, 60, and 90°) and internally (30, 45, and 60°) with the arm elevated 60° at glenohumeral joint (simulated 90° elevation of arm to the trunk). The strain increased with an increase in the weight of the load to LHB and with increase in rotation angle both internally and externally. Since the strain in the posterior portion was larger than that of the anterior portion it seems likely that the labrum, especially the posterior portion, is subject to large strain during biceps loading and arm rotation.

Original languageEnglish
Pages (from-to)261-269
Number of pages9
JournalTohoku Journal of Experimental Medicine
Volume190
Issue number4
DOIs
Publication statusPublished - 2000 Apr

Keywords

  • Biceps loading
  • SLAP lesion
  • Strain
  • Superior labrum

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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