Lumbar multifidus muscle changes in unilateral lumbar disc herniation using magnetic resonance imaging

Objective To assess multifidus muscle asymmetry using the cross-sectional area (CSA) and perpendicular distance of the multifidus muscle to the lamina (MLD) measurements in patients with nerve compression due to lumbosacral disc hernia. Materials and methods In total, 122 patients who underwent microdiscectomy for unilateral radiculopathy caused by disc herniation, diagnosed by magnetic resonance imaging (MRI), were evaluated retrospectively. Posterolateral or foraminal disc herniation at only one disc level, the L3-4, L4-L5, or L5-S1 region, was confirmed using MRI. Subjects were divided by symptom duration: 1–30 days, (group A), 31–90 days (group B), and > 90 days (group C). There were 48 cases in group A, 26 in group B, and 48 in group C. Results In groups A, B, and C, the median MLD differed significantly between the diseased and normal sides ( P