Michael Fredericson

Publication Details

  • Changes in Posterior Lumbar Disk Contour Abnormality with Flexion-Extension Movement in Subjects with Low Back Pain and Degenerative Disk Disease PM&R Lee, S., Lee, J., Butts, K., Carragee, E., Fredericson, M. 2009; 1 (6): 541-546

    Abstract:

    To determine whether posterior lumbar disk contour dimensions differ in the flexed seated, upright seated, and extended seated positions.Two subgroups of subjects with degenerative disk disease were compared: those with central posterior disk bulge (at L4-5 or L5-S1 levels) and those with a dark nucleus pulposus without posterior disk bulge (L3-4, L4-5, and/or L5-S1 levels).Academic medical center.Eight subjects with a central disk bulge and 9 subjects with a dark nucleus pulposus on magnetic resonance imaging.Not applicable.Quantitative comparisons of posterior disk contour between neutral, flexed, and extended sitting positions.Of 8 subjects with central disk bulge, spinal flexion (from the neutral position) produced a decreased disk contour in all subjects, whereas spinal extension (from the neutral position) produced an increased disk contour in 6 subjects, a decreased disk contour in 1 subject, and no measurable change in 1 subject. Changes in posterior disk contour in subjects with a dark nucleus pulposus were variable. Approximately half increased and half decreased, but no relation to position was determined.The results of this pilot study suggest a consistent pattern of decreased posterior disk contour with spinal flexion and increased posterior disk contour with spinal extension in subjects with central disk bulge, but not in those with a dark nucleus pulposus.

    View details for DOI 10.1016/j.pmrj.2009.03.014

    View details for Web of Science ID 000208411600006

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