Case study: New evidence of a piriformis variant inserting onto the hip joint capsule

In this case study we present new evidence of a piriformis muscle variant inserting onto the hip joint capsule similar to that described by Tubbs and Salter. The variant was also atypical in that it originated medial to the first anterior sacral foramina and therefore obscured the union of the S1 nerve root and lumbosacral trunk. We believe this is the first instance that this variant has been noted.