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Clin Shoulder Elbow > Volume 19(2); 2016 > Article
Clinics in Shoulder and Elbow 2016;19(2):90-95.
DOI: https://doi.org/10.5397/cise.2016.19.2.90    Published online June 30, 2016.
Correlation between Subscapularis Tears and the Outcomes of Physical Tests and Isokinetic Muscle Strength Tests
Ho Su Jang, Doo Hwan Kong, Suk Hwan Jang
1Department of Orthopedic Surgery, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea. orthopodjang@gmail.com
2Sports Medical Center, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
3Sports Medical Research Institute, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Received: 13 September 2015   • Revised: 8 December 2015   • Accepted: 10 January 2016
Abstract
BACKGROUND: The aim of this study was to investigate the correlation between the type of subscapularis tendon tears diagnosed during arthroscopy and the outcomes of physical tests and of isokinetic muscle strength tests.
METHODS
We preoperatively evaluated physical outcomes and isokinetic muscle strength of 60 consecutive patients who underwent an arthroscopic rotator cuff repair and/or subacromial decompression. We divided the patients into five groups according to the type of subscapularis tear, which we classified using Lafosse classification system during diagnostic arthroscopic surgery.
RESULTS
When we performed a trend analysis between the outcomes of the physical tests and the severity of subscapularis tendon tear, we found that both the incidence of positive sign of the collective physical tests and that of individual physical tests increased significantly as the severity of the subscapularis tear increased (p<0.001). Similarly, the deficit in isokinetic muscle strength showed a tendency to increase as the severity of subscapularis tear increased, but this positive correlation was statistically significant in only the deficit between those with Lafosse type II tears and those with Lafosse type III tears.
CONCLUSIONS
Although no single diagnostic test surpasses above others in predicting the severity of a subscapularis tear, our study implies that, as a collective unit of tests, the total incidence of the positive rate of the physical tests and the extent of isokinetic strength deficit may correlate with severity of subscapularis tears.
Key Words: Shoulder; Rotator cuff; Arthroscopy; Physical examination; Muscle strength
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