Sciatic nerve and its variations: is it possible to associate them with piriformis syndrome?

Area of Science:

• Anatomy
• Clinical Neuroscience
• Orthopedics

Background:

• The sciatic nerve, originating from the lumbosacral plexus, is critical for lower limb function.
• Anatomical variations in the sciatic nerve's path and division are implicated in piriformis syndrome.
• Piriformis syndrome causes pain and neurological symptoms due to sciatic nerve compression.

Purpose of the Study:

• To systematically review and analyze anatomical variations of the sciatic nerve.
• To investigate the clinical implications of these variations, particularly concerning piriformis syndrome.

Main Methods:

• A systematic review of indexed articles from major scientific databases (PubMed, LILACS, SciELO, etc.) was conducted.
• Studies published between August and September 2018 focusing on sciatic nerve variations were included.
• Key parameters analyzed included the level of sciatic nerve division and its relationship with the piriformis muscle.

Main Results:

• Twelve articles were selected for the review.
• The most frequent variation observed was the common fibular nerve piercing piriformis muscle fibers (33.3%).
• Unclassified anatomical variations and the presence of a double piriformis muscle were also noted in 25% of studies.

Conclusions:

• Significant anatomical variations of the sciatic nerve are prevalent.
• These variations show a potential association with the development of piriformis syndrome.
• Awareness of these anatomical anomalies is essential for accurate clinical assessment of lower limb disorders.