A Dual-Screw Technique for Vertebral Compression Fractures via Robotic Navigation in the Osteopenic Lumbar Spine: An Biomechanical Analysis.

Study Design: Biomechanical cadaveric study.

Objectives: Multi-rod constructs maximize posterior fixation, but most use a single pedicle screw (PS) anchor point to support multiple rods. Robotic navigation allows for insertion of PS and cortical screw (CS) within the same pedicle, providing 4 points of bony fixation per vertebra.

Disrupted superior collicular activity may reveal cervical dystonia disease pathomechanisms.

Cervical dystonia is a common neurological movement disorder characterised by muscle contractions causing abnormal movements and postures affecting the head and neck. The neural networks underpinning this condition are incompletely understood. While animal models suggest a role for the superior colliculus in its pathophysiology, this link has yet to be established in humans.

Biomechanical evaluation of a metal-on-metal cervical intervertebral disc prosthesis.

Background Context: In vitro nondestructive flexibility testing of the CerviCore total disc replacement (TDR) was performed. It was hypothesized that TDR would not significantly alter biomechanics relative to intact, whereas rigid fixation would cause significant changes.

Purpose: To assess the ability of a cervical metal-on-metal saddle-shaped TDR to replicate normal biomechanics in vitro.