Abstract
Purpose
The purpose of this study is to compare shoulder joint biomechanics during abduction with and without intact non-functioning rotator cuff tissue.
Methods
A cadaver model was devised to simulate the clinical findings seen in patients with a massive cuff tear. Eight full upper limb shoulder specimens were studied. Initially, the rotator cuff tendons were left intact, representing a non-functional rotator cuff, as seen in suprascapular nerve paralysis or in cuff repair with a patch. Subsequently, a massive rotator cuff tear was re-created. Three-dimensional kinematics and force requirements for shoulder abduction were analyzed for each condition using ten abduction cycles in the plane of the scapula.
Results
Mediolateral displacements of the glenohumeral rotation center (GHRC) during abduction with an intact non-functioning cuff were minimal, but massive cuff tear resulted in significant lateral displacement of the GHRC (p < 0.013). Similarly, massive cuff tear caused increased superior migration of the GHRC during abduction compared with intact non-functional cuff (p < 0.01). From 5 to 30° of abduction, force requirements were significantly less with an intact non-functioning cuff than with massive cuff tear (p < 0.009).
Conclusion
During abduction, an intact but non-functioning rotator cuff resulted in decreased GHRC displacement in two axes as well as lowered the force requirement for abduction from 5 to 30° as compared with the results following a massive rotator cuff tear. This provides insight into the potential biomechanical effect of repairing massive rotator cuff tears with a biological or synthetic “patch,” which is a new treatment for massive cuff tear.
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Acknowledgments
The authors would like to acknowledge the financial support of NSERC, FQRNT, FRSQ, and the CHUM- Department of Orthopaedic Surgery. All sources of funding had no involvement in the study design, collection and analysis and interpretation of data, writing of the manuscript, or decision to submit the manuscript for publication.
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The authors have no conflicts of interest to declare.
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Tétreault, P., Levasseur, A., Lin, J.C. et al. Passive contribution of the rotator cuff to abduction and joint stability. Surg Radiol Anat 33, 767–773 (2011). https://doi.org/10.1007/s00276-011-0807-9
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DOI: https://doi.org/10.1007/s00276-011-0807-9