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Journal of the Korean Academy of Rehabilitation Medicine 2008;32(1):62-66.
Anatomic Study of Injection Point of Piriformis Muscle on Cadaver Study.
Min, Ji Hye , Choi, Eun Suk , Rhee, Won Ihl , Kim, Go Woon , Lee, Be Na
Department of Rehabilitation Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea. serrom@catholic.ac.kr
사체를 이용한 이상근 주사 위치에 대한 해부학적 지표
민지혜, 최은석, 이원일, 김고운, 이베나
가톨릭대학교 의과대학 재활의학교실
Abstract
Objective
To identify the optimal site for piriformis muscle injection, using easily detectable sacroiliac joint as a landmark, under fluoroscopic guidance.
Method
We examined the anatomic relationships of the sciatic nerve, piriformis muscle and sacroiliac joint in 18 buttocks from 9 cadavers. The distance from the inferior margin of the sacroiliac joint to the piriformis muscle at the crossing point with the sciatic nerve, and the width of the sciatic nerve at that point were measured. We assessed the depth of the piriformis muscle and the sciatic nerve using ultrasonography in asymptomatic controls.
Results
The mean distance from the inferior margin of the sacroiliac joint to the piriformis muscle at the crossing point with the sciatic nerve was 15.7±3.4 (12∼22) mm laterally and 16.5±4.1 (10∼25) mm caudally. The mean width of the sciatic nerve at that point was 15.4±3.7 (12∼22) mm. Ultrasonographic findings revealed the mean distance as 4.48±0.49 cm from the skin to the surface of the piriformis muscle and as 5.68±0.62 from the skin to the surface of the sciatic nerve.
Conclusion
The most optimal injection site for piriformis syndrome was located 15.6±3.4 (12∼22) mm laterally and 16.5±4.1 (10∼25) mm caudally from the inferior margin of the sacroiliac joint. (J Korean Acad Rehab Med 2008; 32: 62-66)
Key Words: Piriformis syndrome, Sciatic nerve, Sacroiliac joint, Fluoroscopic guided injection


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