«Terrible triad» of the shoulder. Biomechanicalsemi-natural modeling andjustificationto rotator cuff restoration

Keywords: axillary nerve, “terrible triad” of the shoulder, m. supraspinatus, rotator cuff tears

Abstract

The aim of this study: was determine the force of tension and deformation of axillary nerve in rupture rotator cuff and paresis of deltoid muscle of the shoulder joint.

Material and methods: Semi-natural modelling based on the axial scans spiral computed tomography of the intact shoulder joint was performed to determine the degree of traction load on the axillary nerve with distal displacement shoulder head and tendon rupture which paresis of the deltoid muscle.

Result: The values of deformations for axillary nerve being at the limit of tissue strength at distal displacement of humeral head of the model by 50 %, progressively increased with increasing distal displacement of humeral head to 100 % of its diameter, reaching values 1.7 times higher than the strength nervous tissue.

Conclusion: The progressive changes occurring in the axillary nerve under the action of traction loads, and as a consequence of its ischemia, over time can lead not only to demyelination, but also to the defeat of the axons themselves atrophy of its fibers. In turn, deltoid muscle atrophy increases the traction load on the affected axillary nerve, which forms a vicious circle. The only possible option to "break" the vicious circle is restore the stabilizing structures damaged during the injury, among which one of the most important is the tendons of the rotator cuff of the shoulder. Surgical restoration of the integrity rotator cuff of the shoulder reduces the traction load acting on the axillary nerve, which in turn significantly improves the conditions for reinnervation of the deltoid muscle.

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Author Biographies

Oleksii Sukhin, Odessa National Medical University

Department of Traumatology and Orthopedics

Sergii Strafun, State Institution “The Institute of Traumatology and Orthopedics” of the National Academy of Medical Sciences of Ukraine

Department of Microsurgery and Reconstructive Surgery of Upper Extremity

Andriy Lysak, State Institution “The Institute of Traumatology and Orthopedics” of the National Academy of Medical Sciences of Ukraine

Department of Microsurgery and Reconstructive Surgery of Upper Extremity

Igor Lazarev, State Institution “The Institute of Traumatology and Orthopedics” of the National Academy of Medical Sciences of Ukraine

Laboratory of Biomechanic

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Published
2021-11-30
How to Cite
Sukhin, O., Strafun, S., Lysak, A., & Lazarev, I. (2021). «Terrible triad» of the shoulder. Biomechanicalsemi-natural modeling andjustificationto rotator cuff restoration. EUREKA: Health Sciences, (6), 17-23. https://doi.org/10.21303/2504-5679.2021.001838
Section
Medicine and Dentistry