title: [Spondylolysis in the developmental stage: diagnostic contribution of MRI].
abstract: OBJECTIVE
  To assess the value of MR imaging in demonstrating ongoing spondylolysis in adolescents.
  
  
  METHODS
  MRI was performed in 9 juvenile patients (3 female, 6 male aged 8-16 years; mean 12.5 y) with pain during hyperextension. In 6 patients a CT scan and in 5 a plain film was available.
  
  
  RESULTS
  In all patients bone marrow edema was found in the pars interarticularis and the pedicle, which was bilateral in 4 patients. In 7/9 cases the L5 vertebra was affected, in 2/9 cases spondylolysis was found in L4. In 3 cases the edema reached the middle third of the vertebral body and a tumor was suspected. In all CT scans a bilateral incomplete or complete cleft in the pars inter-articularis was found. In 4/6 CT-scans a sclerosis was seen in the area of the bone marrow edema. Only in 1/5 plain films was there a suspicion for a spondylolysis, four examinations were completely normal.
  
  
  CONCLUSIONS
  To eliminate underlying causal conditions of spondylolysis and to install specific therapy, early diagnosis is mandatory. MR imaging should be the first and only imaging modality in young patients with low back pain during and after exercise and pain with hyperextension. Bone scans and CT scans should be avoided due to irradiation, plain films usually do not reveal pathological findings in developing sponylolysis.
authors.affiliation: Institut für Radiologische Diagnostik, Ludwig-Maximilians-Universität München Grosshadern.
authors.forename: A
authors.initials: A
authors.lastname: Stäbler
authors.forename: R
authors.initials: R
authors.lastname: Paulus
authors.forename: M
authors.initials: M
authors.lastname: Steinborn
authors.forename: R
authors.initials: R
authors.lastname: Bosch
authors.forename: M
authors.initials: M
authors.lastname: Matzko
authors.forename: M
authors.initials: M
authors.lastname: Reiser
mesh_terms: D000293:Adolescent; D001265:Athletic Injuries / Q000175:diagnosis / Q000209:etiology; D001853:Bone Marrow / Q000473:pathology; D002648:Child; D004487:Edema / Q000175:diagnosis; D005260:Female; D015775:Fractures, Stress / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D008159:Lumbar Vertebrae / Q000293:injuries / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D013169:Spondylolysis / Q000175:diagnosis* / Q000209:etiology; D014057:Tomography, X-Ray Computed