Posture-dependent Bilateral Compression of L4 or L5 Nerve Roots in Facet Hypertrophy: A Dynamic Ct-myelographic Study

摘要: In 12 patients with myelographic evidence of bilateral root involvement at the L3-L4 or L4-L5 levels postmyelographic computerized tomography (CT) studies were performed in flexion and extension. They showed concentric narrowing spinal canal extension widening relief nerve flexion. This could be attributed to presence marked degenerative hypertrophy facet joints, available space for dural sac emerging sleeves. lumbar spine, bulging disc toward hypertrophic facets causes a pincers mechanism anterolateral angles risk compression. is enhanced these cases by dorsal indentation because anterior movement fat pad The authors believe that radiologically described forms anatomic basis neurogenic claudication posture-dependent sciatica.