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Figure 8


Fig. 4A —23-year-old male soccer player with clinical posterior impingement. Sagittal T1-weighted spin-echo fat-suppressed MR image (TR/TE, 456/12) with gadolinium shows os trigonum (asterisk) separate from talus, indicating synchondrosis disruption. Nodular posterolateral synovitis (arrowheads) lies between os trigonum and posterior tibia. There is further synovial thickening (arrow) posterior to ossicle.