Among the various injuries of spine, dislocation of L5-S1 is very rare, because this kind of injury is caused by rare and specific mechanism, probably. About twenty cases of lumbosacral dislocation were reported in other conuntries. Only two
cases
of
posterior dislocation and one case of anterior dislocation were reported in Korea. In spite ofits rarity, it is very important that this kind of injury may be accompanied with considerable neurologic deficit.
In August 1991, we experienced one case of traumatic anterloateral dislocation of L5-S1, accompanied by paraparesis. Emergency manual reduction resulted in excellentlyreduced state radiologicallly, but initial neurologic deficit improved
minimally.
Secondary open discectomy and posterior stabilization using Graf instrument were performed. After one year and 9 months follow-up, the patient complains no low back pain, reveals no radiol gic instability. Most initial neurologic deficits
improved
greatly, however, mild steppage gait on left side due toweakened tibialis anterior power remained.
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