[Clinical and radiological analysis of lumbar spine stability after hemilaminectomy and laminectomy in cases of lumbar disk excision with simultaneous interbody fusion].

108 patient were operated on the Neurosurgical Department of the Military Clinical Hospital in Wrocław since 1989 till 1991. The stability of the lumbar spine after hemilaminectomy and laminectomy with disc excision and interbody fusion was analysed. The period after operation ranged from 6 months to 2 years. Signs of clinical and radiological instability were the base of the study. Respective segmental motions in maximal ante- and retroflexion were calculated. Horizontal intercorporal dislocation was assessed. No signs of instability where found in the analysed material. The results after laminectomy and hemilaminectomy were similar. The failures were not caused by instability.