Asynchronous Joint Rotations

February 13, 2019

Joint surfaces are not symmetrical like a door hinge or a ball and socket, and that makes the limbs rotate during flexion / extension. Watch the hind limb at the stifle joint and it should be obvious that the motion of the limb does not follow a straight line in the direction of the motion of the horse. Healthy kinematics includes limb rotation in a specific synchronization with the phases of a stride, determined by the way the particular horse is put together. In unhealthy kinematics the synchronization is wrong – asynchronous, and when that is repeated over and over, it is a form of overloading - repetition stress injury results. When the motion is in the state of consistent repetitive overloading, new CPG’s need to be created to prevent, slow or stop pathological changes that lead to lameness.