Low-field magnetic resonance imaging of the lumbar spine: reliability of qualitative evaluation of disc and muscle parameters.
OBJECTIVE
To determine the intra- and interobserver reliability in grading disc and muscle parameters using low-field magnetic resonance imaging (MRI).


METHODS
MRI scans of 100 subjects representative of the general population were evaluated blindly by two radiologists. Criteria for grading lumbar discs were based on the spinal nomenclature of the Combined Task Force and the literature. Consensus in rating was achieved by evaluating 50 MRI examinations in tandem. The remaining 50 examinations were evaluated independently by the observers to determine interobserver agreement and re-evaluated by one of the observers to determine intra-observer agreement.


RESULTS
Intra- and interobserver agreement was substantial when grading changes in the lumbar discs. Interobserver agreement was fair to moderate in grading the lumbar muscles, whereas intra-observer agreement was almost perfect.


CONCLUSIONS
Convincing reliability was found in the evaluation of disc- and muscle-related MRI variables.
Solgaard Sorensen
J
J
Back Research Center, Clinical Locomotion Science, University of Southern Denmark, Ringe, Denmark. joan@phvaldemar.dk
Kjaer
P
P
Jensen
Secher T
ST
Andersen
P
P
D000328:Adult; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000150:complications / Q000175:diagnosis*; D008159:Lumbar Vertebrae; D008279:Magnetic Resonance Imaging; D008297:Male; D009135:Muscular Diseases / Q000175:diagnosis* / Q000209:etiology; D015588:Observer Variation; D015203:Reproducibility of Results