Type II. Isthmic: This type results from a defect in the pars interarticularis that allows forward slipping of L5 on S1. Three types of isthmic spondylolistheses are recognized:
Spondylolysis and Spondylolisthesis usually cause no symptoms in children; however, many seek medical evaluation because of a postural deformity or gait abnormality. Pain most often occurs during the adolescent growth spurt and is predominantly backache, with only occasional leg pain. Symptoms are exacerbated by high activity levels or competitive sports and are diminished by activity restriction and rest. The back pain probably results from instability of the affected segment, and the leg pain is usually related to irritation of the L5 nerve root.
The management of traumatic spondylolisthesis of the …
The PLF group has demonstrated a better improvement in functional outcomes, and this coupled with the increased operating time, blood loss and complication rate associated with PLIF surgery, would make us conclude that PLF surgery is the choice for the surgical management of low grade degenerative spondylolisthesis.