Kyphoplasty is a medical procedure where the original height and angle of kyphosis of a fractured vertebra (of certain types) are restored, followed by its stabilization using injected bone filler material. Angle and height restoration are carried out using either hydraulic or mechanical intravertebral expansion. Kyphoplasty is designed to stop the pain caused by the bone fracture, to stabilize the bone, and to restore some or all of the lost vertebral body height due to the compression fracture. It is most commonly performed for spinal compression fractures caused by osteoporosis.