患者男,70岁。因左臀部、左下肢疼痛、麻木、活动受限,逐渐加重半年余,于2002年9月7日入院。体检:L4/5椎间隙左侧旁有轻度压痛和叩击痛,疼痛向左下肢放射。左小腿外侧、足背及足底部感觉减退,左趾感觉缺失。左足伸、伸趾肌及胫前肌肌力0级,左足下垂,不能背伸。左膝反射、跟腱反 Patient male, 70 years old. Due to the left buttocks, left lower extremity pain, numbness, limited mobility, gradually increased more than six months, on September 7, 2002 admission. Physical examination: L4 / 5 next to the left side of the intervertebral space with mild tenderness and percussion pain, pain to the left lower extremity radiation. Left lateral leg, dorsal foot and foot feel decreased, left toe feeling missing. Left foot extension, extensor toe muscle and tibialis anterior muscle strength 0, drooping left foot, can not dorsiflexion. Left knee reflex, Achilles tendon anti