Limitations in clinical outcome after posterior stabilization of thoracolumbar fractures do not correlate with dynamic trunk muscle dysfunction: an ultrasound controlled prospective cohort study.

Muscle thickness and function of the multifidi muscles Patients showed 12 month after surgery a slightly larger muscle thickness of the relaxed as well as of the contracted multifidi muscles at level L3/4 compared to the control group; however, this did not reach statistical significance (muscle diameter: relaxed: SG 28.2 ± 5.8 mm; CG 26.5 ± 5.2 mm; NS/contracted: SG 29.1 ± 5.8 mm; CG 27.8 ± 5.1 mm, NS).

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