Severe Spondylolisthesis

List of Contents.- 1 Severe Spondylolisthesis - Introduction.- 2 Functional Implications of the Morphology of the Lumbosacral Hinge.- 3 Sagittal Profile of Normal Spine Changes in Spondylolisthesis.- 4 Sagittal Plane Alignment at the Lumbo-sacral Junction - Some of the Local Factors Both In and Out of the Control of the Surgeon Effecting Biomechanical Behavior.- 5 Biomechanics of the L5/S1 Junction and the Effect of Spondylolisthesis and Spondyloptosis.- 6 A Finite Element Reflection of the Lumbosacral Junction.- 7 The Mechanics of Severe Spondylolisthesis.- 8 Why Strive for Reduction of High Grade Slips Spondylolisthesis.- 9 Spondylolisthesis - Treatment Options and Alternatives in Managing High Grade Slippage.- 10 Spondyloptosis and Sagittal Profile.- 11 Staged Reduction and Fusion with External Fixateur and Combined Approach for Spondyloptosis.- 12 Treatment of Spondyloptosis by L5 Vertebrectomy with Reduction of L4 onto S1 - A 20-year Review.