Table 2.

Grading system used in the evaluation of MRI examinations

MRI features	Grade 0	Grade 1	Grade 2	Grade 3
Bone marrow edema-like signal intensity [3]a	Normal signal	Increased signal intensity involving< 25% of the bone	Increased signal intensity involving 25–50% of the bone	Increased signal intensity involving> 50% of the bone
Peritendinous effusion [4]a	Radius of effusion collection less than 0.25 times the diameter of tendon	Radius of effusion collection more than 0.25 times and less than 1.0 times the diameter of tendon	Radius of effusion collection greater than 1.0 times the diameter of tendon	–
Ligament injuries [5]a	Normal signal	Intact ligament and surrounding fascial edema	Partial tear, with incomplete disruption of the fibers and surrounding edema	Complete tear with more extensive edema

^aReference number for scaling