Chapter 2

LUMBO-PELVIC DEFINITIONS

1. Kinematics: the study of motion of rigid bodies with no consideration for the forces involved. (Joint motion with no regard for how muscles affect it.) {20}

2. Translation: movement of a body along a straight line relative to a fixed point (sliding, gliding)
{19, 20}

3. Coupling: one motion about an axis associated with another motion about another axis. Spinal motion in one direction occurs simultaneously with motion in another direction. Coupling occurs as a result of the geometric shape of the vertebra, the connecting ligaments and the curvature of the spine. {20}

4. Motion Segment: consists of two adjacent vertebrae and their connecting soft tissue, devoid of musculature. {4, 19, 20} Motion is described as the more cranial vertebra and its relative position to the subjacent vertebra. {4}

5. Hypomobility: limited joint (vertebral segment) motion {2, 19}

6. Hypermobility: excessive joint (vertebral segment) motion {2, 19}

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