title: Radiosteriometric analysis of movement in the sacroiliac joint during a single-leg stance in patients with long-lasting pelvic girdle pain.
abstract: BACKGROUND
  Chamberlain's projections (anterior-posterior X-ray of the pubic symphysis) have been used to diagnose sacroiliac joint mobility during the single-leg stance test. This study examined the movement in the sacroiliac joint during the single-leg stance test with precise radiostereometric analysis.
  
  
  METHODS
  Under general anesthesia, tantalum markers were inserted into the dorsal sacrum and the ilium of 11 patients with long-lasting and severe pelvic girdle pain. After two to three weeks, a radiostereometric analysis was conducted while the subjects performed a single-leg stance.
  
  
  RESULTS
  Small movements were detected in the sacroiliac joint during the single-leg stance. In both the standing- and hanging-leg sacroiliac join, a total of 0.5 degree rotation was observed; however, no translations were detected. There were no differences in total movement between the standing- and hanging-leg sacroiliac joint.
  
  
  CONCLUSIONS
  The movement in the sacroiliac joint during the single-leg stance is small and almost undetectable by the precise radiostereometric analysis. A complex movement pattern was seen during the test, with a combination of movements in the two joints. The interpretation of the results of this study is that, the Chamberlain examination likely is inadequate in the examination of sacroiliac joint movement in patients with pelvic girdle pain.
authors.affiliation: Department of Orthopaedics, Division of Surgery and Clinical Neuroscience, Oslo University Hospital, Oslo, Norway. Electronic address: kibsgard@gmail.com.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Kibsgård
authors.affiliation: Department of Orthopaedics, Division of Surgery and Clinical Neuroscience, Oslo University Hospital, Oslo, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Norway. Electronic address: olav.roise@medisin.uio.no.
authors.forename: Olav
authors.initials: O
authors.lastname: Røise
authors.affiliation: Department of Orthopedics, Ängelholm Hospital, Ängelholm, Sweden. Electronic address: sturesson.bengt@gmail.com.
authors.forename: Bengt
authors.initials: B
authors.lastname: Sturesson
authors.affiliation: Department of Orthopaedics, Division of Surgery and Clinical Neuroscience, Oslo University Hospital, Oslo, Norway. Electronic address: s.m.rohrl@medisin.uio.no.
authors.forename: Stephan M
authors.initials: SM
authors.lastname: Röhrl
authors.affiliation: Department of Orthopaedics, Division of Surgery and Clinical Neuroscience, Oslo University Hospital, Oslo, Norway. Electronic address: britt.stuge@medisin.uio.no.
authors.forename: Britt
authors.initials: B
authors.lastname: Stuge
mesh_terms: D000328:Adult; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D010384:Pelvic Bones / Q000000981:diagnostic imaging / Q000503:physiopathology; D059388:Pelvic Girdle Pain / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011187:Posture; D059869:Radiostereometric Analysis; D012399:Rotation; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging* / Q000503:physiopathology*
keywords: Movement; Pain; Pelvic girdle pain; Radiostereometric analysis; Sacroiliac joint; Single-leg stance