Abstract
Study design
This is a retrospective study.
Purpose
To compare the morphometric parameters of the psoas major and lumbar multifidus muscles in lumbar spinal stenosis (LSS) patients exhibiting different functional performance.
Summary of background data
LSS refers to symptoms related to size reduction of the lumbar spinal canal; however, the degree of stenosis is poorly related to symptom severity and functional impairments. Morphometric changes in the paraspinal muscles have been correlated with chronic lower back pain in previous studies. However, correlations between the functional performance of LSS patients and the morphometric changes in paraspinal muscles have seldom been reported.
Methods
Sixty-six LSS patients without mechanical back pain or segmental instability were enrolled in the study. A review of their medical records and MRI images was performed. Morphometric parameters, including the fatty infiltration (FI) of the lumbar multifidus muscle as well as the relative cross-sectional area (RCSA) of the psoas major and lumbar multifidus muscles, were measured. Subjects were divided into high and low functional performance groups according to their Japanese Orthopedic Association (JOA) scores.
Results
The male LSS patients exhibited a larger psoas RCSA than the female patients, whereas the older patients exhibited a smaller psoas RCSA and higher multifidus FI than the younger patients. LSS patients in the high functional performance group exhibited a significantly larger psoas RCSA and lower multifidus FI.
Conclusion
The psoas RCSA and multifidus FI can be used as predictive factors for functional performance in LSS patients.
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Acknowledgments
This work was supported by the National Taiwan University (NTU-CDP-102R7835), and National Science Council (NSC101-2320-B002-004-MY3) in Taiwan. The authors acknowledge statistical assistance provided by National Translational Medicine and Clinical Trial Resource Center (supported by National Science Council of Taiwan; NSC101-2325-B-002-078).
Conflict of interest
This manuscript does not contain information about medical device(s)/drug(s). No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Ethical approval
The study has been approved and monitored by the Research Ethics Review Committee.
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Chen, YY., Pao, JL., Liaw, CK. et al. Image changes of paraspinal muscles and clinical correlations in patients with unilateral lumbar spinal stenosis. Eur Spine J 23, 999–1006 (2014). https://doi.org/10.1007/s00586-013-3148-z
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DOI: https://doi.org/10.1007/s00586-013-3148-z