Predicted vs. measured paraspinal muscle activity in adolescent idiopathic scoliosis patients: EMG validation of optimization-based musculoskeletal simulations

Rauber, Cedric; Lüscher, Dominique; Poux, Lucile; Schori, Maria; Deml, Moritz C.; Hasler, Carol-Claudius; Bassani, Tito; Galbusera, Fabio; Büchler, Philippe; Schmid, Stefan

doi:10.1016/j.jbiomech.2023.111922

Journal of Biomechanics

2024

DOI: 10.1016/j.jbiomech.2023.111922

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Predicted vs. measured paraspinal muscle activity in adolescent idiopathic scoliosis patients: EMG validation of optimization-based musculoskeletal simulations

Cedric Rauber,

Dominique Lüscher,

Lucile Poux

et al.

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2024

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Cited by 2 publications

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A multibody simulation of the spine for objectification of biomechanical quantities after VBT: a proof of concept and description of baseline data

Frank,

Pishnamaz,

Ignasiak

et al. 2024

Eur Spine J

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Purpose Vertebral Body Tethering (VBT), an alternative treatment for adolescent idiopathic scoliosis, shows satisfactory post-operative results. However, the biomechanical quantities and consequences after VBT surgery remain largely unknown. Therefore, the aim of this study is to analyze the spinal biomechanics during different motions using a multibody simulation approach. Methods The tether and intervertebral compression forces were simulated in a validated spine model during different physiological movements at different pre-tensions and screw positions, while considering the anatomical muscle and ligament properties. Results The simulations showed that an augmentation of the pre-tension and an alteration of the screw position have both significant impact on the intervertebral compression and tether forces. The forces also vary depending on the movement performed, with the highest tether forces measured during lateral bending. In the upright position, with a pre-tension of 200 N, the maximum compression force increases by up to 157% compared to the untethered maximum compression force. The screw position can lead to large differences in the distribution of forces in the spine. Conclusion The biomechanical data provide a first impression of the forces that occur along the spine during various physiological movements and are consistent with published clinical data. Forces are not evenly distributed along the spine, with higher lumbar forces. The tether forces reach values during lateral bending that can potentially destroy the tether´s integrity and thus may explain the common post-operative complication, namely tether breakage. The results of the model can therefore have an impact on future directions for improved surgical VBT treatment.

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A multibody simulation of the spine for objectification of biomechanical quantities after VBT: a proof of concept and description of baseline data

Frank,

Pishnamaz,

Ignasiak

et al. 2024

Eur Spine J

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Enhancing postural balance assessment through neural network-based lower-limb muscle strength evaluation with reduced markers

Chen,

Huang,

et al. 2024

Computer Methods in Biomechanics and Biomedical Engineering

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Predicted vs. measured paraspinal muscle activity in adolescent idiopathic scoliosis patients: EMG validation of optimization-based musculoskeletal simulations

Cited by 2 publications

References 22 publications

A multibody simulation of the spine for objectification of biomechanical quantities after VBT: a proof of concept and description of baseline data

A multibody simulation of the spine for objectification of biomechanical quantities after VBT: a proof of concept and description of baseline data

Enhancing postural balance assessment through neural network-based lower-limb muscle strength evaluation with reduced markers

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