Journal Review - Pedicle screws with a thin hydroxyapatite coating for improving fixation at the bone-implant interface in the osteoporotic spine: experimental study in a porcine model - Risk of Pneumonia After Vertebral Compression Fracture in Women With Low Bone Density: A Population-Based Study - A double-blind randomized controlled trial of the local application of vancomycin versus ampicillin powder into the operative field for thoracic and/or lumbar fusions