title: Persistent synchondrosis of a primary sacral ossification center in an adult with low back pain.
abstract: BACKGROUND
  Persistence of a primary sacral ossification center resulting in synchondrosis in adulthood is rare and can confound diagnostic decision making during patient management.
  
  
  OBJECTIVE
  To present a synchondrosis between the sacral ala and sacral body in a healthy 23-year-old US Marine who had low back pain.
  
  
  METHODS
  Case report.
  
  
  METHODS
  Self-report measures included a numerical pain scale and Roland Morris Disability questionnaire; physiological measures included plain film radiography, computed tomography scans, magnetic resonance imaging, and physical examination procedures; and functional measures included the patient's ability to run and sit without pain and to maintain US Marine Corps fitness standards.
  
  
  METHODS
  The initial management of his low back pain included a course of nonsteroidal anti-inflammatory medication, chiropractic manipulation of the sacroiliac joints and adjacent tissues, and therapeutic exercise. When the patient's condition did not improve as quickly as anticipated, plain X-ray films were ordered; this revealed a vertical cleft in the sacrum at the site of the patient's pain. Further imaging showed the anomalous cleft to be a synchondrosis between the costal element and the centrum of the sacrum. Manual manipulation, physical training, and ergonomic advice were continued.
  
  
  RESULTS
  Pain severity decreased from 7 to 0, and the Roland Morris score decreased from 14 to 1. He could sit for prolonged periods of time and exercise to Marine Corps standards.
  
  
  CONCLUSIONS
  It is unlikely that the synchondrosis was the structure responsible for generating the patient's low back pain. However, such an anomaly is clinically relevant because it may mimic a fracture.
authors.affiliation: Department of Physical and Occupational Therapy, Chiropractic Division, Naval Medical Center San Diego, MCAS Miramar Branch Medical Clinic, PO Box 452002, San Diego, CA 92145-2002, USA. bart.green@med.navy.mil
authors.forename: Bart N
authors.initials: BN
authors.lastname: Green
authors.forename: Gary
authors.initials: G
authors.lastname: Schultz
authors.forename: Mark
authors.initials: M
authors.lastname: Stanley
mesh_terms: D000328:Adult; D006801:Humans; D017116:Low Back Pain / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy; D008279:Magnetic Resonance Imaging; D008297:Male; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy; D012447:Sacrum / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed