Tendon-defect and muscle-unloaded models for relating a rotator cuff tear to glenohumeral stability

H. C. Hsu, N. D. Boardman, Z. P. Luo, K. N. An

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19 引文 斯高帕斯(Scopus)

摘要

Rotator cuff tear and glenohumeral instability are closely related. Any tear may disturb muscle force generation due to pain inhibition. In addition, a full-thickness tear may foster instability by removing a structural element constraining the joint. It was hypothesized that the loss of both dynamic force and static constraint with a rotator cuff tear will affect glenohumeral stability. In a tendon-defect model, dynamic and static elements of the joint were sacrificed. In a muscle-unloaded model, only the dynamic element was removed. The location and size of the defect were also investigated. The effect on instability of a small tendon defect was less than that of muscle unloading, implying that a patient with a small tear would have less instability than a patient with weak or nonfunctioning supraspinatus and infraspinatus muscles. On the other hand, with a larger tear the defect had a greater effect than muscle-unloading because sectioning of the glenohumeral and coracohumeral ligaments was included in the model. Clinically, such a defect in the front is critical for anterior stability because it might insult the important anterior capsule ligamentous complex. Orthopaedic surgeons should pay attention, therefore, to the effect of possible associated lesions of static constraints based on the size and location of the tear in addition to the dynamic stabilizer.

原文English
頁(從 - 到)952-958
頁數7
期刊Journal of Orthopaedic Research
18
發行號6
DOIs
出版狀態Published - 2000 1月 1

All Science Journal Classification (ASJC) codes

  • 骨科和運動醫學

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