1. Physical basis of movement, kinematics, dynamics

Kinematics (description of movements)

type of movement
Neutral/starting position
direction of movements
range of motion

Dynamics

analysis of the movement caused by external and internal forces acting on the segment (time, speed acceleration, direction)

Rotational component

when the segment moves around a fixed mechanical axis, visible to each movement.

Rotational component is perpendicular to the segment

Function: Mobilization

Translational component

Linear movements

Translational component of a muscle is parallel to the segment

Function: Stabilization

Kinematic movement rules

If no passive translational component, rotation cannot be done

Translational components between joint types

Compression
Distraction
Translation, gliding/sliding, rolling
Spinning
Segment - from center of joint to the center of neighboring joint.

Statics

the effect of external and internal forces, the sum of the forces, gaining and loosing balance

Center of gravity

Anteriorly on 2nd sacral vertebrae

Line of gravity in sagittal plane

-In front of the external auditory duct
-Passing through the turning points of C2, T1, T12, and L5, and on the center point of the lumbosacral joint
-In front of sacroiliac joint
-Passing through greater trochanter
-Infront of knee but behind patella
-1.5-2.5cam from medial malleolus