Posterior cervical screw systems are comprised of multiple, interconnecting components, made from a variety of materials that allow an implant system to be built from the occiput to the upper thoracic spine to fit the patient's anatomical and physiological requirements, as determined by preoperative cross-sectional imaging. Such a spinal assembly consists of a combination of bone anchors via screws (i.e., occipital screws, cervical lateral mass screws, cervical pedicle screws, C2 pars screws, C2 translaminar screws, C2 transarticular screws), longitudinal members (e.g., plates, rods, including dual diameter rods, plate/rod combinations), transverse or cross connectors, interconnection mechanisms (e.g., rod-to-rod connectors, offset connectors), and closure mechanisms (e.g., set screws, nuts).
Posterior cervical screw systems are intended to provide immobilization and stabilization of spinal segments in patients as an adjunct to fusion for acute and chronic instabilities of the cervical spine and/or craniocervical junction and/or cervicothoracic junction such as: (1) Traumatic spinal fractures and/or traumatic dislocations; (2) deformities; (3) instabilities; (4) failed previous fusions (e.g., pseudarthrosis); (5) tumors; (6) inflammatory disorders; (7) spinal degeneration, including neck and/or arm pain of discogenic origin as confirmed by imaging studies (radiographs, CT, MRI); (8) degeneration of the facets with instability; and (9) reconstruction following decompression to treat radiculopathy and/or myelopathy. These systems are also intended to restore the integrity of the spinal column even in the absence of fusion for a limited time period in patients with advanced stage tumors involving the cervical spine in whom life expectancy is of insufficient duration to permit achievement of fusion.
Features & Benefits
Polyaxial Pedical Screw
Φ3.5 * 10/12/14/16/18/20/22/24/16/28/30mm
Φ4.0 * 10/12/14/16/18/20/22/24/16/28/30mm
Popular Science Content
The primary goal of a posterior cervical procedure is to relieve pressure on the nerve roots or spinal cord in the cervical spine using a surgical approach through the back of the body.
During surgery, the patient lies face down. The surgeon makes an incision in the skin on the back of the neck over the vertebra(e) to be treated.
Depending on the site of compression, removal of the lamina as well as removal of bone spurs may be performed where the nerve roots exit the spinal canal.
There are different types of fixation that may be placed in the neck to help promote posterior cervical fusion.
Screw and Rod Fixation
Screws or hooks and rods are used to hold the spinal column in place while fusion occurs or to provide stability. The screws are inserted into the left and right sides of the vertebrae to be fused. A rod connects the screws to stabilize the spine on each side. Caps secure each screw to the rod.
Bone graft may be added along the side of the vertebrae to help with fusion. Once the surgery is complete, the surgeon closes the incision and moves the patient into recovery.
Over time, the vertebrae can grow together through fusion. Complete fusion varies among patients and can take a few months to a couple of years.
Laminoplasty is a surgical procedure in which the lamina is repositioned to relieve the symptoms caused by spinal cord compression. The lamina is a bony structure at the rear of the vertebra. Each vertebra includes two laminae that form the roof over the spinal canal to protect the back of the spinal cord.
Decompression is achieved by opening and elevating the lamina to alleviate pressure on the spinal cord. The surgeon lifts one side of the lamina to widen the spinal canal and relieve pressure.
To hold the lamina open, the surgeon may insert an implant such as a laminoplasty plate.