DiNenna, Michael A.
(2024)
Analyzing Strain in the Medial Collateral Ligament with Dynamic Mode Decomposition.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
The medial collateral ligament is one of the primary stabilizers of the knee, and injury to it can impair knee function. A better understanding of the ligament’s role in knee motion and load, can lead to improved treatment of injuries. Ligament function is related to the load carried by the ligament, which is related to ligament strains. Several studies have measured the overall axial strain of the ligament, but few have measured the strain distribution in the tissue under anatomical knee loads. This study used image analysis with robotically applied knee loads to measure the strain distribution in the ligament at different flexion angles. This study found that the maximum longitudinal strain from each load was approximately 4% (-4% during passive path) in the posterior femoral region of the ligament. The maximum tensile transverse strain from the passive path, anterior tibial loading, and external tibial torque was 4%, 8%, and 12%, respectively, at the anterior midsection of the ligament. The shear strain due to anterior tibial loading and external tibial torque was 4% and 8%, respectively, at the anterior midsection of the MCL. In comparison, a 4% and 5% shear strain due to the passive path and a valgus moment was measured at the posterior femoral region of the ligament. To characterize the main strain patterns with knee flexion, dynamic mode decomposition was used to analyze the strain data. The longitudinal strain patterns grew with flexion angle for the passive path and anterior tibial loading but decayed for the external tibial torque and valgus moment. Transverse strain patterns decayed with flexion angle, especially in the anterior midsection of the ligament. Meanwhile, shear strain patterns for the passive path, anterior tibial loading, external tibial torque, and valgus moment were not monotonic with flexion angle. The data from this study will provide a greater understanding of the function of the medial collateral ligament with knee load and flexion angle. The data can also be used to benchmark ligament repair and reconstruction methods.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
6 September 2024 |
| Date Type: |
Publication |
| Defense Date: |
26 July 2024 |
| Approval Date: |
6 September 2024 |
| Submission Date: |
3 July 2024 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
232 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Dynamic Mode Decomposition
Medial Collateral Ligament
Ligament Strain |
| Date Deposited: |
06 Sep 2024 19:57 |
| Last Modified: |
06 Sep 2024 19:57 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/46655 |
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