Table I.

Park MRI scoring system of osteoarthritis.

Grade 0	No cartilage injury with no osteophytes or osteophytes <5mm
Grade I	Altered internal signal of the cartilage and at least one of the followings: Osteophytes >5mm, Bone marrow edema >10mm, subchondral cyst>10mm.
Grade II	: Cartilage defect less than 99% and at least one of the followings: Osteophytes >5mm, Bone marrow edema >10mm, subchondral cyst>10mm.
Grade III	Total Cartilage defect and at least one of the followings: Osteophytes >5mm, Bone marrow edema >10mm, subchondral cyst>10mm.
Grade IV	Total cartilage loss with meniscal injury grade III.