12岁男孩，跌跤后当晚自感全身不适，发 热，左膝部疼痛，经用青霉素3日无效来 院。检查左股骨下端肿胀，有局限性深压 痛，膝关节内有积液，活动障碍，体温 39 . 5℃。白细胞计数18x109/L，中性粒细 胞90%，红细胞沉降率80mm/h。诊断为

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