PHED-3117EL Lecture 12: Chapter 12 - Lumbar Spinal Conditions
27 Apr 2020
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Lumbar spine: forms convex curve anteriorly, 5 lumbar, 5 fused sacral, and 4 small, fused coccygeal vertebrae. Sacrum articulates with ilium sacroiliac joint. Iliolumbar ligaments: posterior sacroiliac ligaments, sacrospinous ligament, sacrotuberous ligament. Muscles of trunk: paired, unilaterally: produce lateral flexion and/or rotation of the trunk, bilaterally: trunk flexion or extension. Primary movers for back extension erector spinae muscles. Nerve plexus: lumbar (t12-l5, sacral (portion of lumbar [l4-l5]) Movements are a result of addictive motion from multiple segmental levels: flexion/extension/hyperextension, lateral flexion, rotation. Spinal flexion vs. hip flexion vs. forward pelvic tilt. Effects of body position: line of gravity passes anterior to spinal column, trunk flexion. Increase moment arm for bw; increase bending moment: counteract moment via tension in back muscles. Increases tension in back increase compression lumbar spine. Load upright standing compared to: sitting increase, spinal flexion increase, slouched sitting increase. Lordosis: abnormal exaggeration of lumbar curve, cause include, congenital deformities, weak abdominal musculature, poor posture, activities with excessive hyperextension.
