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Shape Classification of the Anterior Cruciate Ligament Cross Section

DiNenna, Michael A. (2022) Shape Classification of the Anterior Cruciate Ligament Cross Section. Master's Thesis, University of Pittsburgh. (Unpublished)

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The objective of this study is to quantifiably classify the shape of the cross section of the anterior cruciate ligament (ACL). This will be done with the use of a three-dimensional laser scanner to construct a solid model and mathematical analysis.
Ten freshly frozen cadaveric knees were used in this study. The intact knees were positioned in a six degrees of freedom robotic testing system. The knee was passively moved by the robot from full extension to 15 degrees flexion. The knee was then dissected so that only the ACL, tibia, and femur remained. The dissected knee was placed in the robot and placed into the same position of 15 degrees of flexion as the intact knee. The ACL was laser scanned and the insertions sites points were discretized. A three-dimensional model was constructed using software. The ligament axis was defined to be the line that connects the centroids of the two insertion sites. Five planes were defined perpendicular to this axis to represent the cross sections. Points outlining each cross section were compared to five shapes (ellipse, rectangle, triangle, peanut shape, and kidney shape) and the fit of the shape was measured using a Procrustes analysis.
Twenty-nine out of the fifty cross sections were found to be best fit to an ellipse. Compared to seven for triangle and kidney shape, five for rectangle, and only two for the peanut shape.
Overall, the ellipse provided the best fit for a plurality of the cross sections. This study may provide information to construct ACL grafts with shapes closer to that of the original tissue.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
DiNenna, Michael A.mad367@pitt.edumad3670000-0002-5655-9829
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSmolinski, Patrick S.patsmol@pitt.edupatsmol
Thesis AdvisorSmolinski, Patrick S.patsmol@pitt.edupatsmol
Committee MemberLin, Jeen-Shangjslin@pitt.edujslin
Committee MemberWang, Qing-Mingqiw4@pitt.eduqiw4
Committee MemberMiller, Mark C.mcmllr@pitt.edumcmllr
Date: 16 January 2022
Date Type: Publication
Defense Date: 2 November 2021
Approval Date: 16 January 2022
Submission Date: 1 November 2021
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 48
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: matrices, vector, Procrustes distance
Date Deposited: 16 Jan 2022 17:55
Last Modified: 16 Jan 2022 17:55

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  • Shape Classification of the Anterior Cruciate Ligament Cross Section. (deposited 16 Jan 2022 17:55) [Currently Displayed]


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