A posterior cervical polyaxial screw (lateral mass screw) is a specialized spinal fixation device used in posterior cervical instrumentation systems. It is inserted into the lateral mass of the cervical vertebrae, a preferred anatomical site for achieving safe and stable fixation in the cervical spine.

The screw features a polyaxial (multi-directional) head, allowing angular movement between the screw shaft and head. This design provides greater flexibility during rod placement, making it easier to align rods even when screw trajectories vary. It simplifies surgical technique and reduces stress during construct assembly.

Manufactured from medical-grade titanium or titanium alloy, the screw offers excellent strength, durability, and biocompatibility. Its thread design ensures strong bone purchase and reliable fixation, while the polyaxial head enables secure locking with rods for a stable construct.

These screws are widely used in posterior cervical fusion, trauma fixation, degenerative conditions, tumors, and deformity correction, where precise alignment and strong stabilization are essential.

🔹 Key Features

• Polyaxial movable head for multi-directional flexibility
• Designed for lateral mass fixation in cervical spine
• Facilitates easy rod alignment and insertion
• Strong bone purchase and stable fixation
• Compatible with posterior rod systems
• Made from titanium or titanium alloy

🔹 Common Applications

• Posterior cervical fusion procedures
• Cervical trauma and instability
• Degenerative cervical spine conditions
• Tumor and deformity correction