Mid-range shoulder instability modeled as a cam-follower mechanism

Laurent Willemot, Andrew Thoreson, Breighner Ryan Breighner, Alexander Hooke, Olivier Verborgt, Kai Nan An

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this paper, we model a simplified glenohumeral joint as a cam-follower mechanism during experimental simulated dislocation. Thus, humeral head trajectory and translational forces are predicted using only contact surface geometry and compressive forces as function inputs. We demonstrate this new interpretation of glenohumeral stability and verify the accuracy of the method by physically testing a custom-molded, idealized shoulder model and comparing data to the output of the 2D mathematical model. Comparison of translational forces between experimental and mathematical approaches resulted in r<sup>2</sup> of 0.88 and 0.90 for the small and large humeral head sizes, respectively. Comparison of the lateral displacement resulted in r<sup>2</sup> of 0.99 and 0.98 for the small and larger humeral head sizes, respectively. Comparing translational forces between experiments and the mathematical model when varying the compressive force to 30N, 60N, and 90N resulted in r<sup>2</sup> of 0.90, 0.82, and 0.89, respectively. The preliminary success of this study is motivation to introduce the effects of soft tissue such as cartilage and validation with a cadaver model. The use of simple mathematical models such as this aid in the set-up and understanding of experiments in stability research and avoid unnecessary depletion of cadaveric resources.

Original languageEnglish (US)
Pages (from-to)2227-2231
Number of pages5
JournalJournal of Biomechanics
Volume48
Issue number10
DOIs
StatePublished - Jul 16 2015

Fingerprint

Humeral Head
Cams
Theoretical Models
Mathematical models
Shoulder Joint
Cartilage
Cadaver
Experiments
Trajectories
Tissue
Geometry
Testing
Research

Keywords

  • Glenohumeral instability
  • Kinematics
  • Modeling

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Rehabilitation
  • Biophysics
  • Biomedical Engineering

Cite this

Willemot, L., Thoreson, A., Ryan Breighner, B., Hooke, A., Verborgt, O., & An, K. N. (2015). Mid-range shoulder instability modeled as a cam-follower mechanism. Journal of Biomechanics, 48(10), 2227-2231. https://doi.org/10.1016/j.jbiomech.2015.02.053

Mid-range shoulder instability modeled as a cam-follower mechanism. / Willemot, Laurent; Thoreson, Andrew; Ryan Breighner, Breighner; Hooke, Alexander; Verborgt, Olivier; An, Kai Nan.

In: Journal of Biomechanics, Vol. 48, No. 10, 16.07.2015, p. 2227-2231.

Research output: Contribution to journalArticle

Willemot, L, Thoreson, A, Ryan Breighner, B, Hooke, A, Verborgt, O & An, KN 2015, 'Mid-range shoulder instability modeled as a cam-follower mechanism', Journal of Biomechanics, vol. 48, no. 10, pp. 2227-2231. https://doi.org/10.1016/j.jbiomech.2015.02.053
Willemot L, Thoreson A, Ryan Breighner B, Hooke A, Verborgt O, An KN. Mid-range shoulder instability modeled as a cam-follower mechanism. Journal of Biomechanics. 2015 Jul 16;48(10):2227-2231. https://doi.org/10.1016/j.jbiomech.2015.02.053
Willemot, Laurent ; Thoreson, Andrew ; Ryan Breighner, Breighner ; Hooke, Alexander ; Verborgt, Olivier ; An, Kai Nan. / Mid-range shoulder instability modeled as a cam-follower mechanism. In: Journal of Biomechanics. 2015 ; Vol. 48, No. 10. pp. 2227-2231.
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