The Mono Sacral Screw XL Single Lock-Dual Thread is a specialized screw used for spinal fixation, primarily in the sacrum or lower lumbar spine, requiring robust fixation and a specialized thread pattern. The key differentiating feature is its Dual Thread design (a large outer thread for cancellous purchase and a finer inner thread for cortex grip, or simply two different thread pitches) . This Monoaxial screw has a rigid, fixed head, providing high stability at the bone-screw interface, and an XL designation for robust use. It is designed to provide secure fixation, especially in osteoporotic or compromised bone quality often found in the sacrum.

Key features include:

• Dual Thread Design: Offers improved purchase and pull-out resistance, especially in bone with reduced density.

• Monoaxial (Fixed Head): Provides high stability and resistance to toggling at the fixation site.

• XL Size: Indicates suitability for robust fixation in the sacrum or denser vertebral bodies.

• Primary Use: Lumbar and Sacral fusion procedures (e.g., S1 fixation) requiring maximum pull-out strength.

• Code Structure: Available in 4.5mm, 5.5mm, and 6.5mm diameters.