Topographic variations of the relationship of the sciatic nerve and the piriformis muscle and its relevance to palsy after total hip arthroplasty
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- Pokorný, D., Jahoda, D., Veigl, D. et al. Surg Radiol Anat (2006) 28: 88. doi:10.1007/s00276-005-0056-x
The sciatic nerve exits below the piriformis muscle in 79.1% of the cases.
The sciatic nerve separates into two divisions above the piriformis, one branch passing through the muscle, the other below it (14.3%).
An unsplit nerve passes through the piriformis muscle in 2.2%.
The nerve separates into two divisions above the piriformis, one branch exiting above the muscle and passing along its dorsal aspect, the second exiting distally below the muscle in 4.4%.