Delserro, Sean
(2019)
Stress Shielding of the Rotator Cable in the Lateral Rotator Cuff.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
The goal of the project was to test and quantify the biomechanical behavior of the rotator cable and crescent area, as measured by strain and abduction force. The hypothesis was 1) the rotator cable stress shields the crescent area and 2) the rotator cable transmits load during shoulder abduction.
Strain and abduction force were measured for the native, anterior or posterior rotator cable release and anterior and posterior cable release in 10 cadaveric specimens. A computer-controlled shoulder simulator, which applies known loads on the rotator cuff muscles, was developed to measure forces generated at the distal humerus and major principal strain and strain angle in the superior portion of the rotator cuff in cadaveric shoulders at three abduction angles: at 0°, 45° and 90° of scapular plane abduction..
Abduction force significant dropped significantly dropped after single release and full release of the rotator cable at 0 abduction for both the anterior and posterior initial release groups. Significant difference was found in major principal strain in zone 2 of the anterior group at 0 abduction between the native and full release condition. At 30 of abduction significant difference in strain angle was found between intact vs. full release and anterior release vs. full release in the anterior group at zone 16. No other significant differences were found in major principal strain or strain angle.
Although significant differences in major principal strain and strain angle were found, they were few and provided no pattern. We believe this is sufficient evidence to suggest that the rotator cable does not stress shield the lateral crescent region. Releasing the cable insertion sites did significantly decrease the abduction force generated at 0 abduction. Therefore, the rotator cable and crescent region are important structures in initiating shoulder abduction and tears in these regions are biomechanically significant and should be repaired accordingly.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
18 June 2019 |
| Date Type: |
Publication |
| Defense Date: |
3 April 2019 |
| Approval Date: |
18 June 2019 |
| Submission Date: |
4 April 2019 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
77 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
shoulder, biomechanics, strain, upper extremity |
| Date Deposited: |
18 Jun 2019 18:01 |
| Last Modified: |
18 Jun 2019 18:01 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/36296 |
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