SPINE KINETICS (BIOMECHANIS OF SPINE)Physiotherapy Tutorial
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summary of the video with the time for reference:
1.Axial compression 2:19
-Gravity, GRF, Muscular fore, ligament
-Compressive force (25-55)% is taken up by cancellous bone before 40 and after that its taken up by cortical bone
-Zygophyseal joint takes about (0-33)% forces are taken up which varies with region and posture
-Nucleus exerts an outward pressure which is countered by anulus and an equilibrium is created so that forces are absorbed
-Disc exhibits property of creep
-Diurinal changes in thickness of the disc
2.Shear forces 7:00
-Translatory forces on object in opposite direction
-Acts on the mid plane of the disc
-vertebra at lumbar spine have facets in sagittal plane which resists shear force
3.Axial Rotation 8:28
-Stiffness is given to the vertebra against torsion by Anulus according to its orientation, facet and ligaments
-Apart from that it has high risk for rupture when rotation is combined with flexion and compression
4.Bending force 10:08
-Commonly seen in flexion and extension
-Creep is exhibited by disc
-If structures go past the toe region the structure cannot come back to its orignal position and there are high chances of injury
-Lateral flexion movements are stabilized by inter transverse ligament
#biomechanicsofspine
#spinebiomechanics
#vertebralcolumnbiomechanics
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