STUDY DESIGN Prospective randomized clinical trials. OBJECTIVE To compare the outcome data with respect to clinical success rates and incidence of adjacent level disease (ALD) in patients after total disc arthroplasty (TDA) or anterior cervical fusion (ACDF) for 1- and 2-level cervical disc disease. SUMMARY OF BACKGROUND DATA Previously published studies have provided evidence that ACDF pro...

BACKGROUND Anterior lumbar disc replacements are used to restore spinal alignment and kinematics of a degenerated segment. Compared to fusion of the segment, disc replacements may prevent adjacent segment degeneration. To resolve some of the deficiencies of anterior lumbar arthroplasty, such as the approach itself, difficulty of revision, and postoperative facet pain, 360° motion preservation s...

Purpose of Review Anterior cervical fusion, the gold standard for reconstruction following anterior cervical decompression, is both safe and effective but potentially accelerates degeneration of adjacent segments. Artificial disk replacement is an emerging technology with the potential to maintain motion and decrease adjacent segment degeneration. Several devices are currently in pilot studies ...

J.H. van Dieën Degeneration, injury and surgical interventions may alter the mechanical properties of spinal motion segments, but the quantification of these alterations is problematic. Manual or instrumented loading of single segments in the intact spine as applied intra-operatively may overestimate the mechanical properties of this segment, because the applied load is partly sustained by the ...

OBJECTIVE For multi-level spondylolysis patients, surgeons commonly choose to fix all the segments with pars interarticularis defect even those without slippage and not responsible for clinical symptoms. In this study, we tried to study the necessity of the preventative long-segment surgery for the defected segment without slippage in treatment of multi-level spondylolysis patients from a biome...