Effect of Iatrogenic Muscle Injuries on Spine Biomechanics During Posterior Lumbar Surgeries Using a Biomechanical Model for Design of Rehabilitation Exercises

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Jamshidnezhad, Saman | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46984 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Arjmand, Navid
Abstract:
Posterior lumbar surgery is often associated with extensive injuries to back muscles. In this thesis, the effect of such iatrogenic injuries in some patients was examined. For this purpose, the CSA of back muscles in 6 patients were measured using MR scan. To examine any natural change in CSAs of healthy people or instrument errors, same measurement were carried out on 10 healthy volunteers. In addition, a detailed anatomical model of an intact human spine was developed. With the aim of experimental studies and intact model, the post-operative model of patients was also developed. These two models were used to quantizing the change in activity of back muscles during some symmetric, normal tasks. Results show that the CSAs of erector spine and multifidus muscles decrease 11% and 14% respectively. Moreover the activity of muscles changes due to posterior lumbar surgery with the greatest change for multifidus muscle. Change in compression and shear forces of spine in different tasks is negligible
Keywords:
Biomechanical Modeling ; Lumbar Spine Portion ; Posterior Lumbar Surgery ; Muscle Activity