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(A-D) Grading system of facet joint osteoarthritis in T2-weighted imaging according to Weishaupt et al[5]. Grade 0: Homogenous cartilage and normal (2-4 mm) joint space width; Grade I: Narrowing of the joint space and small osteophytes; Grade II: Narrowing of the joint space, moderate osteophytes and/or subchondral erosions; Grade III: Narrowing of the joint space, large osteophytes and subchondral erosion/cysts.
