Abstract
Purpose
Iatrogenic injuries to paraspinal muscles during the posterior lumbar surgery (PLS) cause a reduction in their cross-sectional areas (CSAs) and contractile densities over time post-surgery. This study aims to quantify such alterations.
Method
Pre- and postoperative CSAs (~6 months interval) of all paraspinal muscles were measured in six patients undergoing PLS using a 3-T magnetic resonance (MR) scanner to quantify the alterations in geometrical and tissue effective contractile (non-fatty) CSAs of these muscles at all lumbar levels. To examine the presence of any confounding effects on recorded changes within ~7-month period, measurements were also carried out on ten healthy volunteers.
Results
In the healthy population, an important (~22 %) portion of CSA of the erector spinae (ES) was noncontractile at the lower lumbar levels. Negligible variations over time in both the total geometrical (<1.7 % in average) and contractile (<1.2 %) CSAs of muscles were observed in the healthy group (i.e., no confounding effect). Following PLS, significant reductions were observed in the geometrical CSA of only multifidus (MF) muscle by ~14 and 11 % as well as in its contractile CSA by ~26 and 14 % at the L5–S1 and L4–L5 levels, respectively.
Conclusion
The total CSA of ES at lower lumbar levels shows substantial noncontractile contents in both healthy and patient populations. Biomechanical models of the spine should hence account for the noncontractile contents using only the effective contractile muscle CSAs. Postoperative variations in CSAs of paraspinal muscles may have profound effects on patterns of muscle activities, spinal loading, and stability.
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Acknowledgments
This work was supported by grants from the Iran National Science Foundation (INSF), Sharif University of Technology (Tehran, Iran), Tehran University of Medical Sciences (Tehran, Iran), Institut de recherche Robert-Sauvé en santé et en sécurité du travail, IRSST, (Montréal, Canada), and Natural Sciences and Engineering Research Council of Canada (NSERC). Assistance of Mr. Saman Jamshidnejad is greatly appreciated.
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The authors have no conflicts of interest concern.
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Ghiasi, M.S., Arjmand, N., Shirazi-Adl, A. et al. Cross-sectional area of human trunk paraspinal muscles before and after posterior lumbar surgery using magnetic resonance imaging. Eur Spine J 25, 774–782 (2016). https://doi.org/10.1007/s00586-015-4014-y
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DOI: https://doi.org/10.1007/s00586-015-4014-y