Convex-Concave Rule (and concave-convex rule)
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Convex-concave rule and concave-convex rules describe an arthrokinematic pattern that minimizes the inherent migration of the center of the axis of rotation of a joint, in the direction of arthrokinematic roll. Note, these rules were developed with the intent to aid in teaching, specifically to assist with “visualizing” joint motion. They were not intended to dictate the direction of joint mobilization or manipulation techniques (although they can aid in decision-making).