Polyaxial Screw

Specifications - Polyaxial Screw

p>Polyaxial Screw are used in a spinal fusion to add extra support and strength to the fusion while it heals. The screws themselves do not fixate the spinal segment, but act as firm anchor points that can then be connected with a rod.

Polyaxial Screw allow for multi-directional movement or angulation between the screw head and screw body. Unlike fixed-angle screws, which have a defined angle between the head and body, Polyaxial Screw allow surgeons to alter the screw trajectory within a given range of motion. This adaptability gives you more options for adapting specific patient anatomy and optimising screw placement.

Sizes and Uses of Polyaxial Screw

Polyaxial Screw is made from titanium, come in a variety of shapes and sizes to meet the demands of the patient.
Diameters: 4.5mm, 5mm, 5.5mm, 6.5mm and 7mm.
Lengths: 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm and 60mm

Polyaxial Screw System intended to provide immobilization and stabilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar, and sacral spine: degenerative spondylolisthesis with objective evidence of neurologic impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor, and failed previous fusion

Polyaxial Pedicle Screw are placed above and below the vertebrae that were fused. A rod is used to connect the screws which prevents movement and allows the bone graft to heal. After the bone graft grows, the screws and rods are no longer needed for stability and may be safely removed with a subsequent back surgery. Removal isn’t necessary unless they cause the patient discomfort.

Improved Screw Placement Accuracy:
Polyaxial screws allow surgeons to modify the screw angle during surgery, allowing for more precise placement. This adaptability is especially important when dealing with complex spinal abnormalities since it allows the surgeon to tailor the screw trajectory to the patient’s specific anatomy. The risk of harming surrounding structures is reduced by optimising screw location while guaranteeing secure fastening.

Increased Fusion Rates:
The major goal of spinal fusion surgery is to achieve a strong fusion between the vertebrae, which promotes stability and relieves discomfort. Polyaxial screws are essential in this process. The ability to precisely position the screws allows for ideal vertebral body alignment and compression, facilitating the fusion process. Polyaxial screws’ increased rigidity stimulates bone growth and fusion, resulting in better fusion rates and long-term outcomes for patients.

Reduced possibility of screw pullout:
Compared to conventional screws, Polyaxial screws feature a design that allows for a bigger contact area with the bone. The chance of the screw loosening or dislodging after surgery is decreased by the increased contact area, which also improves the screw’s pullout strength. The increased stability contributes to maintaining the spine’s proper alignment and reducing the risk of device failure, which enhances the fusion procedure’s overall success.