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Angle-or,,,,,-Pull-of-Muscleexercise therapy.pptx
- 1. ANGLE OF PULL OF MUSCLE Dr.kavita Meena Department of Physiotherapy
- 2. Skeletal muscles areattached to bones on each end by tendons. The origin: is the fixed attachment The insertion: moves with contraction.
- 3. DEFINITION Angle between muscle insertionand bone on which it inserts. Rotary component Nonrotary component
- 4. INTRODUCTION A force ismost effective when it is applied at right angle. Muscle’s angle of pull changes with every degree of joint motion.
- 5. MECHANICAL EFFICIENCY OFA MUSCLE Mechanically the pull is most efficient when the muscle is inserted at right angles to the bone. Rotary Component: Force of a muscle contributing to bone's movement around a joint axis.
- 6. ANGLE OF PULLIS REDUCED… <90° This efficiency is decreased as the angle of pull is reduced, because some of the force is used in pulling the bone of insertion towards the joint representing the fulcrum.
- 7. Most resting muscles havean angle of pull < 90°. Helps to maintain stability of the joint. Closer the angle of pull is to 90° greater the Rotary component.
- 8. ANGLE OF PULL…..90° The approximation of the articular surfaces has a stabilizing effect upon the joint which is greatest when the direction of the pull of muscle is longitudinal.
- 9. ANGLE OF PULLIS INCREASED… >90° The mechanical efficiency of the muscle pull is also reduced when the angle of insertion is increased from the right angle.
- 10. ANGLE OF PULLIS INCREASED… >90° (CONTI…) In this case the joint becomes less stable as the angle increases. Can not exert much force.
- 12. EFFICIENCY OF ARESISTANCE The sustained pull of a force offering resistance will also be maximal when it is applied at right angle to a lever. It will decrease as the angle of pull becomes acute / obtuse.
- 13. Resistance can beapplied with the help of rope / therapist hand. Right angle pull is employed in that part of the ange in which maximum resistance is required.