Evaluation of the Translation Distance of the Glenohumeral Joint and the Function of the Rotator Cuff on Its Translation: A Cadaveric Study

Yusuke Kawano, Noboru Matsumura, Akihiko Murai, Mitsunori Tada, Morio Matsumoto, Masaya Nakamura, Takeo Nagura

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Purpose: To evaluate the distance and position of humeral head translation during glenohumeral motion and to investigate the function of the rotator cuff in glenohumeral translation. Methods: Using 9 cadavers, glenohumeral translation during passive pendulum motion was tracked by an optical motion capture system. Tension was applied to 5 compartments of the rotator cuff muscles, and 7 different conditions of rotator cuff dysfunction were sequentially simulated. Three-dimensional glenohumeral structure was reconstructed from the computed tomography images of the specimens, and the distance and position of glenohumeral translation were compared among the conditions. Results: The average radius of glenohumeral translation was 10.6 ± 4.3 mm when static loading was applied to all rotator cuff muscles. The radius increased significantly in the models without traction force on the supraspinatus and total subscapularis tendons (P =.030). The position of the translation center did not change in the mediolateral direction (P =.587) and in the anteroposterior direction (P =.138), but it moved significantly superiorly in the models without supraspinatus and infraspinatus loading (P =.011) and in those without supraspinatus, infraspinatus, and teres minor loading (P <.001). Conclusions: The distance and position of humeral head translation during glenohumeral motion changed with rotator cuff deficiency. The present study indicated that the subscapularis plays an important role in maintaining the central position of the humeral head, and that the infraspinatus acts as a major depressor of the humeral head during shoulder motion. Clinical Relevance: The results of this study suggest that extension of a tear into the subscapularis should be avoided to maintain the centering function of the glenohumeral joint in cases with rotator cuff tear.

Original languageEnglish
Pages (from-to)1776-1784
Number of pages9
JournalArthroscopy - Journal of Arthroscopic and Related Surgery
Volume34
Issue number6
DOIs
Publication statusPublished - 06-2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine

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