In vitro simulation of torque-induced rotator cuff damage

Various aspects of rotator cuff tears have been studied in depth, including the primary pathogenesis and mechanical properties. There is, however, a lack of information available on the injury mechanics associated with sudden torque loading of the shoulder. To investigate the mechanical response of the Supraspinatus tendon and the joint capsule when exposed to repeated near-instantaneous torques, an in vitro test apparatus was developed. Supraspinatus and capsular reaction forces, capsular surface strains, and shoulder accelerations were measured over 30 cycles of applied torque. A decreasing logarithmic decay was found in the difference between the initial and final loads within each cycle. A generalized force-displacement fiber recruitment model was used to determine the protective role of the capsule by evaluating changes in stiffness. The results suggest that while relatively more damage happens in the first few high-torque load cycles, sudden adduction loading injuries are likely fatigue-based in nature.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2018

Author dc:creator

• Shanley, IV, John Francis

Contributors dc:contributor

• Kersh, Mariana E.

• Rotator Cuff
• Damage

Statement dc:rights

• © 2018 John Francis Shanley IV

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/101082

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/101082