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rkneevelocitydefn2.jpg_then_the_z-components_of_this_second_definition_and_the_original_joint_angle_definition_can_be_compared._if_the_y-component_the_2nd_component_of_the_knee_angle_is_small_it_is_often_referred_to_as_ab_adduction_but_it_is_important_to_note_that_this_rotation_is_technically_isn_t_about_either_the_y-axis_of_the_thigh_or_shank_segments._if_this_joint_angle_y-component_isn_t_small_then_it_is_not_really_possible_to_compare_the_y-components_between_the_joint_angle_and_joint_velocity_items}}}}}}}}
