In terms of etiology, of the 20 patients, six 30% cases had degenerative disc disease associated with stenosis of the lumbosacral canal; there was one 5% case of pure degenerative disc; two 10% cases of degenerative disc disease associated with degenerative spondylolisthesis; four 20% cases of degenerative spondylolisthesis type three in the Wiltse 1969 classification and grade one in the Meyerding classification; six 30% cases of isthmic spondylolisthesis Wiltse type two, of which five were grade 1 and one grade 2 in the Meyerding classification; and one 5% case of stenosis of the lumbar canal associated with degenerative adjacent syndrome.
Con respecto a la etiología ,de los 20 pacientes, seis 30% casos eran portadores de patología discal degenerativa asociada a canal lumbosacro estrecho, un 5% caso de discopatia degenerativa pura, dos 10% casos de enfermedad discal degenerativa asociado a espondilolistesis degenerativa, cuatro 20%casos de espondilolistesis degenerativa tipo tres de la clasificación de-Wiltse 1969 y grado un de la clasificación de Meyerding, seis 30% casos de espondilolistesis ístmica tipo dos de Wiltse de los cuales cinco eran grado 1 y 1 grado 2 de la clasificación de Meyerding y 15% caso de canal lumbar estrecho asociado a síndrome adyacente degenerativo.