Investigation of realization mechanism of shoulder dislocation in patients with hill-sachs lesion using method of mathematic modeling

Authors

  • Olexiy Tyazhelov
  • Marianna Bitsadze
  • Mykhaylo Karpinsky

DOI:

https://doi.org/10.15674/0030-59872015437-42

Keywords:

shoulder joint, instability, Hill-Sachs lesion, shoulder-slip

Abstract

Differences between atmospheric and intraarticular pressure during shoulder movement provoke pull-effect that stabilize shoulder joint. Due to impression lesion of humerus head the congruence of articular surfaces and stabilizing effect are disturbed, that leads shoulder instability. Goal: to determine the force intensity, that provides pull-effect, and efficacy of its influence under the conditions of shoulder instability combined with Hill-Sachs lesion; to investigate the mechanism of realization of humerus head dislocation in the conditions of the incongruence of shoulder joint surfaces. Methods: mathematic modeling of the stabilizing effect of shoulder joint due to the differences between atmospheric and intraarticular pressure was performed. The method of calculation of vacuum cup for industrial work was used as a background for the calculation of force providing pull-effect in shoulder. Mathematic modeling of the probability of realization of shoulder dislocation under the conditions of Hill-Sachs lesion was performed using the method for determination of catching of tappet gear. Results: it was determined that the mechanism providing pull-effect in shoulder joint is a factor of its primary stabilization under conditions of muscle relaxation. Efficacy of the force that provides pull-effect in shoulder lasts if the area of scapular joint surfaces at least twice the size of defect area on the joint surface of humeral head. It was proved that impressed defect is a clue mechanism for the realization of shoulder dislocation. The main indices for the realization of this mechanism are an angle of inclination of humeral head defect in the point of probable contact and speed of movement in shoulder joint. The stability of shoulder joint remains if the angle of defect inclination is more then 60º and area of defect is not more then 1/2 of sacpular joint surface.

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How to Cite

Tyazhelov, O., Bitsadze, M., & Karpinsky, M. (2015). Investigation of realization mechanism of shoulder dislocation in patients with hill-sachs lesion using method of mathematic modeling. ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, (4), 37–42. https://doi.org/10.15674/0030-59872015437-42

Issue

No. 4 (2015)

Section

ORIGINAL ARTICLES

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Copyright (c) 2015 Olexiy Tyazhelov, Marianna Bitsadze, Mykhaylo Karpinsky

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