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. The procedure is commonly done percutaneously. Height and angle restoration are currently carried out by 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^*.

One of the perceived benefits of kyphoplasty (developed primarily by a Sunnyvale, CA-based company called Kyphon) over vertebroplasty is that kyphoplasty uses a "balloon" to create a void in the cancellous part of the collapsed vertebral body that can then be filled with a more viscous bone cement (proprietary). The viscous properties of this bone cement decrease the likelihood that the cement will leak out of the vertebral body and affect other parts of the vertebra, especially the spinal cavity which contains the sensitive spinal nerves. Inflating the balloon within the bone can also help reduce the deformity (which can lead to a hunchback appearance) created by the collapsed bone, as the balloon helps restore some or most of the vertebral height. It is hyphothesized that helping restore the spine's natural geometry should help reduce the risk of future vertebral compression fractures^*. In theory, helping restore some percentage of the vertebral body's pre-fracture height should also alleviate any pain caused by compression of the thoracic cavity and decrease the associated risk of mortality.

The procedure can be performed under either local or general anesthesia, on multiple levels, out-patient or in-patient, and is viewed as minimally invasive. It is most commonly performed for spinal compression fractures caused by osteoporosis, a condition that weakens the bone, and is also sometimes performed for certain other conditions that may have led to a spinal fracture.

The procedure is often carried out under fluoroscopy as a interventional radiographic procedure. It is most commonly done within eight weeks of when the fracture occurs.

External links

• Vertebroplasty and Kyphoplasty: Percutaneous injection procedures for vertebral fractures Patient information, including an animation of kyphoplasty
• Osteoporosis: Vertebroplasty and Kyphoplasty: Treatment for Compression Fracutres Resulting from Osteoporosis
• Information from Kyphon.com
• webcast replay of a live kyphoplasty (requires RealPlayer)

Radiology