Spicer, Christopher S.
(2020)
Rotator Cable Strain and the Abduction Force after Transection of the Cable Insertions.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
The goal of this study was to assess the functionality of the rotator cable in stress-shielding the rotator crescent region. The hypothesis was that releasing the rotator cable would significantly increase strain in the rotator crescent and significantly decrease abduction force.
Surface strain and abduction force were measured for 8 cadaveric specimens for three different states of the rotator cable: intact, anterior or posterior insertion released, and both anterior and posterior insertions released. A custom-built shoulder simulator applied a physiological loading pattern to the rotator cuff muscles to simulate abduction. For each cable state, the specimen was fixed in place at both 0 and 30 degrees of abduction. Four specific regions were analyzed for strain: two areas towards the center of the rotator crescent and an area on both the supraspinatus and infraspinatus tendons. Statistical analysis was performed with anterior and posterior separated and with the two groups combined comparing the intact state to the fully released state.
No significant change was found in major principal strain across any of the four regions or two abduction angles when analyzing both the anterior and posterior groups separated and combined. A significant increase in abduction force was found at 0 degrees of abduction when the groups were combined. No other significant changes in abduction force were found.
The increase in abduction force indicates that the rotator crescent area is a better abductor than the rotator cable and is not stress-shielded by the cable. The results of the strain analysis also demonstrate this by showing no significant change upon cable release. Therefore, the rotator cable should not be relied upon to shield tears in the rotator crescent, and these tears should be surgically repaired.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
| Creators | Email | Pitt Username | ORCID  |
|---|
| Spicer, Christopher S. | css44@pitt.edu | css44 | |
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| ETD Committee: |
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| Date: |
27 September 2020 |
| Date Type: |
Publication |
| Defense Date: |
16 July 2020 |
| Approval Date: |
27 September 2020 |
| Submission Date: |
23 July 2020 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
45 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering and Materials Science |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Shoulder, Anatomy, Biomechanics, Rotator Cuff |
| Date Deposited: |
27 Sep 2020 22:53 |
| Last Modified: |
27 Sep 2020 22:53 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/39411 |
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