Figure 2From: No correlation between slip reduction in low-grade spondylolisthesis or change in neuroforaminal morphology and clinical outcome Typical example of radiographic parameter measurements preoperative and at 1Â year follow-up. Preoperative listhesis of 8.6Â mm was reduced to 0.0Â mm, foraminal diameter was altered from 22.7Â mm to 20.4Â mm postoperatively. Anterior disc height decreased from 7.9Â mm to 6.9Â mm.Back to article page