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患儿．男，50天，以左下肢活动受限半月入院。半月前无明显诱因出现左下肢活动受限，家长抱起患儿或更换尿布时，患儿即哭吵不安。在当地医院就诊．无明显好转。转入我院。发病以来，患儿无发热，无外伤，无肌注药物史。吮奶正常，两便正常。第I胎，足月顺产，母乳喂养。其父有
Children. Male, 50 days, limited to half of left leg movement admitted to hospital. Half a month ago there was no obvious incentive for the left lower extremity activities are limited, parents pick up children or change diapers, the children are crying and restless. Visit a local hospital. No significant improvement. Into our hospital. Since onset, children with fever, no trauma, no intramuscular drug history. Sucking milk normal, two will be normal. The first tire, term full-term, breastfeeding. His father has