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Fig. 2 —Bilateral grade 0 facet joint osteoarthritis. 48-year-old woman with normal (grade 0) facet joints at L5-S1 level. T2-weighted axial MR image (TR/TE, 4,000/96) shows thin, well-demarcated hyperintense line (straight arrows), presumably caused by combination of intraarticular fluid and superficial parts of articular cartilage. Hypointense line (curved arrows), in part, represents subchondral bone and deep layers of articular cartilage. Findings suggestive of subchondral sclerosis, osteophytes, and cysts are absent.