title: Piriformis muscle: clinical anatomy with computed tomography in korean population.
abstract: BACKGROUND
  The objective was to evaluate the distance from the skin and the diameter of the piriformis muscle and their relationship to the body mass index (BMI).
  
  
  METHODS
  The study was a prospective study involving 60 patients. Patients were prepared on a radiological table in the prone position. Several images were obtained of each. In this view, the distance between the subcutaneous tissue and the piriformis muscle, and the diameter of the piriformis, were measured at three points (medially to laterally).
  
  
  RESULTS
  The distance to the piriformis from the skin was 6.6 ± 0.9 cm, 6.3 ± 0.8 cm, and 5.2 ± 0.9 cm in terms of the lateral, center, and medial measurement, respectively. The center of the piriformis had a greater diameter with 1.7 ± 0.4 (0.9-2.5) cm. The distance to the piriformis increased with BMI.
  
  
  CONCLUSIONS
  This study shows that the lateral of the piriformis muscle has a relatively greater distance from the skin. The center of the piriformis showed a greater diameter than other two portions. We found that the distance of the piriformis from subcutaneous tissues was correlated with BMI, but the diameter of the piriformis was not affected by BMI. These measurements can be used as a reference for determining the piriformis injection site in patients with piriformis syndrome.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Daegu Wooridul Hospital, Daegu, Korea.
authors.forename: Chan Hong
authors.initials: CH
authors.lastname: Park
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Sang Chul
authors.initials: SC
authors.lastname: Lee
authors.forename: Hahck Soo
authors.initials: HS
authors.lastname: Park