患者,女,12岁。生后左肘部活动较对侧不灵活10余年,近有加重,来院治疗。神清合作,营养发育中等,头颅、五官和脊柱无异常。心肺无特殊。腹软,肝脾不大。专科体检:右肘外形无红、肿、痛,伸屈有轻度前内旋位,无压痛。左肘及双下肢无异常。右前臂正、侧位平片,包肘关节和腕关节(图1 Patient, female, 12 years old. Left elbow activity after birth than the opposite side is not flexible more than 10 years, nearly aggravated, to hospital treatment. Clear cooperation, nutrition and development of moderate, head, facial features and spine without exception. No special cardiopulmonary. Abdominal soft, small spleen and liver. Specialist examination: the shape of the right elbow no red, swollen, pain, flexion and extension with mild anterior pronation, no tenderness. Left elbow and lower extremities without exception. Right forearm is, lateral plain film, including the elbow and wrist (Figure 1