RESUMEN
Pelvic morphology is involved in the genesis of spondylolisthesis. The mean age of patients with spondylolisthesis was 57.9 +/- 9.5 years [40-81]. 14 were complaining of low back pain and 12 had sciatica. Spondylolisthesis was in stage 1 in 75% of the cases and in stage 2 in 25% of the cases. Low lordosis was observed in patients and controls in 73% and 100% of the cases respectively. Sacral slops was slightly higher in patients than in controls and was higher than 40 degrees in patients and controls at a rate of 35% and 25% respectively. The incidence was higher in patients than in controls. There was a high pelvic retroversion in patients than in controls. High incidence and pelvic retroversion were found in patients with spondylolisthesis and pelvic morphology was probably involved in the genesis of spondylolisthesis