Fig. 1a–bFrom: The correlation between exaggerated fluid in lumbar facet joints and degenerative spondylolisthesis: prospective study of 52 patientsLateral flexion radiograph of a 55 year-old male showing an L4 anterolisthesis of greater than 15% (a), which was unrecognized on the supine sagittal MRI (b)Back to article page