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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The aim of this paper was to study the anatomical relationship between the piriformis muscle and the sciatic nerve with regard to the possibility of neurological deficit after THA. The incidence of anatomical variation of both structures is 15–30% in the literature. The authors studied 91 cadavers and found an atypical relationship in 19 cases (20.9%). In this study individual variations were found with the following frequency:
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%.
- Topographic variations of the relationship of the sciatic nerve and the piriformis muscle and its relevance to palsy after total hip arthroplasty
Surgical and Radiologic Anatomy
Volume 28, Issue 1 , pp 88-91
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- Sciatic nerve
- Piriformis muscle
- Anatomical variations
- Hip replacement
- Hip prosthesis
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