例1:女2天。右膝关节活动少伴肿胀2天。患儿系第1胎第1产,孕37周,顺产,生后无窒息。其母孕期无明显外伤史。查体:体温36、,呼吸40次/分,脉搏120次/分,体重3.37kg。精神反应好,心、肺、腹无异常。右膝半屈位,略肿,髌骨可触及,膝关节被动伸展可达60°位,屈曲100°位,完全伸直有侧 Example 1: Female 2 days. Right knee activity with swelling less 2 days. The first child in the first child of the fetus, 37 weeks of pregnancy, spontaneous birth, postnatal asphyxia. The mother had no history of trauma. Physical examination: body temperature 36 ,, breathing 40 beats / min, pulse 120 beats / min, body weight 3.37kg. Good mental response, heart, lung, abdomen without exception. Half knee flexion of the right knee, slightly swollen, palpable patella, knee passive extension of up to 60 °, 100 ° flexion, fully straightened with the side