Lumbar spondylolisthesis is a common musculoskeletal condition, which may be a factor in some people with lower back symptoms. As an anterior displacement of a vertebra in relation to the segment immediately below, they may be classified according to: • Cause – type I, congenital; type II, pars interarticularis defect; type III, degenerative; type IV, … Continue reading MRI Diagnosis of Lumbar Spine Unstable Spondylolisthesis