Spinal Biomechanics Flashcards
Arthrokinematics: Flexion
upper facets glide anteroproximally and tilt forward
Arthrokinematics: Extension
upper facets move downward, slightly posterior and tilt backward
Arthrokinematics: Sidebending
when SB right - upper facet moves down and slightly anterior while left facet moves upward and slightly posterior - together overall both facets move to left
Arthrokinematics: Cervical Rotation
R rotation causes facets on R to glide down and back, causing approximation of facets on R
Arthrokinematics: Lumbar/Thoracic Rotation
(very little) clinically important bc this motion causes separation and approximation of the facet joints: if L3 rotates R, there is a separation at R L3-L4 joint and approximation at L L3-L4
Coupled Motions: Cervical C1 (AO)
when occiput side bends, C1 rotates in OPPOSITE direction
Coupled Motions: Cervical C2-C7
Side bending and rotation occur in the SAME direction regardless of when spine is in neutral, ext or flexion
Coupled Motions: Neutral/Extension - Lumbar/Thoracic
lumbar segments will side bend and rotate in OPPOSITE directions (side bend R, rotate L)
Coupled Motions: Flexion - Lumbar/Thoracic
lumbar segments will side bend and rotate in the SAME direction
Lumbopelvic Rhythm: Flexion
Lumbar spine goes through 60-70 deg of motion and then pelvis will rotate anteriorly to allow more movement, eventually followed by flexion of hips
Lumbopelvic Rhythm: Extension
(coming from flexed position) hips extend, pelvis rotates posterior and then spine begins to extend
SIJ Osteokinematics: Motion during ambulation
multiple plane motion
SIJ Osteokinematics: Nutation
movement that involves flexion of sacrum and posterior rotation of ilium
SIJ Osteokinematics: Counternutation
movement that involves extension of sacrum and anterior rotation of ilium
