一、临床资料:患者,女性,17岁。因右骶髂部疼痛4小时,以右骶髂部挫伤入院。患者4小时前骑自行车与行驶小货车相撞。当即摔倒地而上,具体跌倒情形述不清,致右骶髂部剧痛,送到医院摄骨盆片未见骨折像,回家休息。病人伤后不能站立行走。床上翻身困难,家属有疑虑,再次来院就诊。查体:一般状态良好,骶髂部双侧对称,无明显畸形,右骶髂部压痛明 First, the clinical data: patients, women, 17 years old. Due to the right sacral iliac pain for 4 hours to right sacral iliac contusion admission. The patient collided with a small pickup truck 4 hours earlier. Immediately fell to the ground, the specific circumstances of the fall is not clear, resulting in severe pain in the right sacral iliac, pelvis pelvis taken to the hospital no fracture, go home and rest. The patient can not walk after injury. Difficult to stand up in bed, family members have doubts, come to hospital again. Physical examination: the general condition is good, sacral iliac bilateral bilateral symmetry, no significant deformity, right sacral iliac tenderness