title: The incidence of sacroiliac joint disease in patients with low-back pain.
abstract: OBJECTIVE
  The clinical presentation of intervertebral disc, facet joint, nerve root, and sacroiliac (SI) joint diseases are often indistinguishable. SI joint arthritis likely accounts for a significant proportion of what is called "low-back pain" or "sciatica." Our goal was to determine the incidence of SI joint arthritis in patients with this presentation.
  
  
  METHODS
  Computed tomographic (CT) scans of the lumbosacral spine (LSS) of patients referred with low-back pain, sciatica, spinal stenosis or disc pathology were gathered over a 3-month period. Scans were retrospectively reviewed by 2 independent readers for SI joint arthritis. When there was disagreement, the 2 readers reviewed the case and reached a concensus opinion. SI joint arthritis was considered to be present if subchondral sclerosis, osteophytosis, or cartilage loss was noted on the CT scan.
  
  
  RESULTS
  The SI joint(s) were visualized by both readers on 64 LSS CT scans performed in 29 women and 35 men, mean age 52 years. By the aforementioned criteria, 16 SI joints (25%) were considered normal by both readers. In 48 cases (75%), there was evidence of osteoarthritis. The diagnosis of osteoarthritis was made by concensus opinion in 8 of these 48 cases (16%).
  
  
  CONCLUSIONS
  There is a relatively high incidence of SI joint arthritis in patients undergoing evaluation for "low-back pain" or "sciatica." Hence, SI joint arthritis should be considered a possible diagnosis in these patients.
authors.affiliation: Department of Diagnostic Radiology, Royal Victoria Hospital, McGill University Health Centre, Montreal, Que. jchodge@rad.mgh.mcgill.ca
authors.forename: J C
authors.initials: JC
authors.lastname: Hodge
authors.forename: B
authors.initials: B
authors.lastname: Bessette
mesh_terms: D001168:Arthritis / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000000981:diagnostic imaging; D017116:Low Back Pain / Q000000981:diagnostic imaging*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D010003:Osteoarthritis / Q000000981:diagnostic imaging; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging*; D012585:Sciatica / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D013130:Spinal Stenosis / Q000000981:diagnostic imaging; D013131:Spine / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed