Fig. 1From: Evaluation the association of facet tropism in multi-sports athletes with cervical disc herniaReference line (RL) was accepted as the line passing through the center of the disc and the middle of the processus spinosus. The facet line (FL) was defined as the line drawn between the anteromedial and posteromedial edges of the upper joint facets on both sides. The angle between the two lines was measured and defined as the facet joint angle on both sidesBack to article page