SUMMARY
Background. The sciatic nerve is the largest and thickest branch of the lumbosacral plexus. It separates into numerous branches and exhibits multiple anatomical variations that may result in nerve compression, a factor that is attributed to its location in the pelvis. This study aims to detect sciatic nerve branch variation and its association with the piriformis muscle and to establish the prevalence of each variant using routine pelvic MRI examinations.
Methods. This was a cross-sectional retrospective study of patients who underwent pelvic MRI studies from January 2018 to December 2020. Collected data included patient demographics, anatomical type of sciatic nerve (according to the Beaton and Anson classification system) and history of radiculopathy or sciatic nerve symptoms.
Data was collected, and descriptive statistics were analyzed with a p < 0.05 considered as statistically significant.
Results. A total of 188 patients were included in the study. The majority (95.7%) of the patients exhibited the type 1 variant, while type 2 and type 3 variants exhibited a prevalence of 3.2% and 1.1%, respectively. No statistically significant difference in history of radiculopathy and sciatica was identified between the different anatomical variants.
Conclusions. The sciatic nerve’s anatomical variation in relation to the piriformis muscle can be identified on routine pelvic MRI scans, with most of the detected variants being type 1. This study confirms the anatomical variations of the sciatic nerve in the pelvic region which can be detected on routine MRI.
Anatomical Variation of the Sciatic Nerve in Relation to the Piriformis Muscle: An MRI Study
Mona I. Almuhaish, Iba I. AlFawaz, Tarek M. Hegazi, Sulaiman A. Al-Mousa, Shayma S. Alsubaie, Abdulaziz A. Alkhaldi, Majed M. AlMutairi, Talal H. Alshammari, Hussain F. Alhowaish, Mohammad M. Alzahrani
Original Article, 228-233
Keywords: anatomical variation, MRI, piriformis muscle, Sciatic nerve, sciatica,
Table of Content: Vol. 13 (No.2) 2023 April/June
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Anatomical Variation of the Sciatic Nerve in Relation to the Piriformis Muscle: An MRI Study
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