summary Piriformis syndrome is a condition characterized by sciatic symptoms (leg pain) due to extrapelvic sciatic nerve compression at the hip. Diagnosis is made clinically with pain in the posterior gluteal region and migrating down the back of the leg which is made worse with flexion, adduction, and internal rotation of hip. Treatment is rest, NSAIDs, and physical therapy focused on stretching the piriformis muscle and short external rotators. Etiology Pathophysiology pathoanatomy sciatic nerve entrapment occurs anterior to piriformis muscle or posterior to obturator internus/gemelli complex at level of ischial tuberosity anatomic anomalies may contribute to compression including bipartite piriformis variations of sciatic nerve path tumors aneurysm of inferior gluteal artery Associated conditions femoroacetabular impingement decreased internal rotation may contribute to contractures of short external rotators and compression on sciatic nerve Anatomy Sciatic nerve exits inferior to piriformis superior to superior gemellus Muscles external rotators of the thigh include (superior to inferior) piriformis superior gemellus obturator internus inferior gemellus obturator externus quadratus femoris Presentation Symptoms pain in the posterior gluteal region and migrating down the back of the leg pain may be burning or aching in nature similar to sciatica symptoms Physical exam FAIR test Flexion, Adduction, and Internal Rotation of hip can reproduce symptoms maneuver places piriformis muscle on tension Imaging Radiographs unremarkable MRI usually unremarkable lumbar MRI helpful to rule out spine as cause of compression of sciatic nerve Electrodiagnostic studies can document functional impairment of sciatic nerve Treatment Nonoperative rest, NSAIDS, muscle relaxants, PT, steroid injections indications first line of treatment technique focused on stretching the piriformis muscle and short external rotators corticosteroid injection directed near the piriformis muscles Operative piriformis muscle release and external sciatic neurolysis indications only indicated in refractory cases after failed conservative measures
QUESTIONS 1 of 1 1 Previous Next (OBQ09.37) Which of the following is the most common anatomical pattern of the sciatic nerve as it exits the pelvis? QID: 2850 Type & Select Correct Answer 1 As a single nerve, anterior to the piriformis muscle 68% (2808/4124) 2 As a single nerve, posterior to the piriformis muscle 25% (1011/4124) 3 As two branches, both anterior to piriformis muscle 4% (148/4124) 4 As two branches, one anterior to piriformis and one through the piriformis muscle 2% (62/4124) 5 As two branches, both posterior to the piriformis muscle 2% (79/4124) L 1 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review Tested Concept Review Full Topic
All Videos (2) Podcasts (0) Login to View Community Videos Login to View Community Videos 2017 Chicago Sports Medicine Symposium: World Series of Surgery Deep Gluteal Space Syndrome - Hal Martin, DO (CSMS #93, 2017) Hal Martin Knee & Sports - Piriformis Muscles Syndrome B 11/17/2017 452 views 3.7 (7) Login to View Community Videos Login to View Community Videos Piriformis syndrome exam David Abbasi Knee & Sports - Piriformis Muscles Syndrome B 8/24/2012 3896 views 4.7 (9)