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MRI shows combined injury of the MPFL with tear, surrounding oedema near the adductor tubercle and discontinuity at the patellar insertion (arrows) in a 13-year-old girl 3 days after primary patellar dislocation (a). Arthroscopy discovered haematoma at the patellar margin (b), but mini-open exploration could not confirm a substantial disruption of the medial ligamentous complex
