A regular polyaxial screw is an orthopedic implant used in spinal fixation systems to stabilize the vertebral column. Unlike monoaxial screws, polyaxial screws have a ball-and-socket joint between the screw shaft and the head, allowing the head to move in multiple directions. This multi-directional movement helps surgeons easily align the screw head with spinal rods, even when screws are inserted at slightly different angles.

The screw is inserted into the pedicle of a vertebra, providing a secure anchor in the bone. After insertion, a spinal rod is placed into the screw head, and a locking cap is used to secure the rod in place. The adjustable head simplifies the rod placement process and reduces stress during assembly of the spinal instrumentation system.

Polyaxial screws are typically manufactured from biocompatible materials such as titanium alloy or stainless steel, ensuring durability, corrosion resistance, and compatibility with the human body. These screws are widely used in spinal fusion, trauma treatment, deformity correction, and degenerative spine stabilization, as they provide flexibility during surgery while still offering strong spinal support.

3. Key Features

• Movable (multi-axial) head allowing adjustment in multiple directions.
• Ball-and-socket mechanism between the screw head and shaft.
• Easier rod alignment and placement during surgery.
• Threaded shaft for secure fixation in vertebral bone.
• Compatible with rods, locking caps, and spinal fixation systems.
• Made from biocompatible materials such as titanium alloy or stainless steel.
• Available in different lengths and diameters for different spinal levels.

4. Applications

• Spinal fusion surgery for stabilizing vertebrae.
• Treatment of spinal fractures and trauma.
• Correction of spinal deformities such as scoliosis.
• Stabilization in degenerative spine diseases.
• Spinal tumor or infection stabilization procedures.
• General spinal instrumentation systems used in orthopedic and neurosurgical procedures.