Angle of pull: Biomechanics

Angle of pull:

"Angle between the line of pull of the muscle and the bone on which it inserts ( angle towards the joint ;inside)."

Angle of pull change according to the range at which the muscle acts.

Components

vertical and horizontal components

The effect of angle of pull of the muscle on the magnitude of rotary and non-rotary component at three different angles of pull.

 - force may be resolve into a vertical and horizontal component. - the larger the angle(0-90) , greater the vertical and less the horizontal components. - vertical component is perpendicular to the lever, called the rotary component.

- horizontal component is parallel to lever, called non-rotary component.

Note:- Most resting muscle having an angle of pull of 90 degree.