Piriformis syndrome is an entrapment neuropathy and exceedingly rare. Piriformis syndrome is not related to clonus or tremors. Most misdiagnosed Piriformis syndromes are nerve root stretch injuries or contusions of the L5 or S1 roots with an occasional L4 thrown in there. A nerve block around the Piriformis muscle that yields great temporary relief is a reasonable test but is not diagnostic as it can be positive (+relief) with no Piriformis syndrome present.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.