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The kinematics in (A) Type 1 and (B) Type 4 lesions are shown. In the Type 1 lesion, the radial head was relatively stable during forearm rotation, and d-R and COR translation were minimal, whereas in the Type 4 lesion, the radial head showed a pattern similar to clock motion during forearm rotation, and d-R and COR translation were large. COR = center of the radial head; d-R = distance from the COR to the mean axis of rotation (AOR).
