Abstract
MRI of the Psoas Major Muscle: Origin, Attachment, Anatomical Variants and Correlation with the Lumbar Disc Extrusion
Highlights
The Psoas major muscle (PMM) runs on both sides of the lumbar column originating from the thoracolumbar segment
The absence of PMM attachment to the disc may contribute to disc extrusion
Variant of origin: We considered as anatomical variants of the PMM origin, when the muscle did not originate from the Th12-L1 disc level, as reported in the literature and most anatomy books
Summary
The Psoas major muscle (PMM) runs on both sides of the lumbar column originating from the thoracolumbar segment. Viewed on the magnetic resonance (MR) coronal images of the lumbar region, the PMM major has a fusiform appearance with relative sharp borders and a symmetrical configuration, in most individuals (Figure 1). This study focuses entirely on the anatomy and the anatomical variants of the PMM, amid the biomechanical role of the latter in the motion of the lumbar spine and the hip [3]. The exact origin of the PMM varies. Most of the reports [4,5,6,7,8] on the PMM focus on its biomechanical role in the stability and motility of the lumbar spine. There are no dedicated studies on the prevalence of the variants of the PMM origin. The possible interference of these variants in the spine biomechanics has not been investigated
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