A Ø 5.5 mm / 3.5 mm combi rod is a specialized spinal rod featuring two different diameters within a single construct—typically 5.5 mm on one end and 3.5 mm on the other. It is designed to bridge and connect spinal fixation systems that use different rod sizes, such as transitioning from cervical (3.5 mm) to thoracic or lumbar (5.5 mm) instrumentation.

This dual-diameter design eliminates the need for additional connectors, providing a seamless transition between systems, reducing implant bulk, and improving overall construct efficiency. It ensures uniform load distribution and enhanced structural stability across different spinal regions.

Manufactured from medical-grade titanium alloy or stainless steel, the combi rod offers high strength, fatigue resistance, and excellent biocompatibility. It can be contoured intraoperatively to match the natural curvature of the spine, allowing precise anatomical alignment.

These rods are widely used in complex spinal surgeries, long-segment fixation, deformity correction, and revision procedures, where integration of multiple spinal systems is required.

🔹 Key Features

• Dual diameter design (5.5 mm and 3.5 mm)
• Enables transition between different rod systems
• Eliminates need for additional connectors
• High strength and fatigue resistance
• Easily contourable for anatomical fit
• Made from titanium or stainless steel

🔹 Common Applications

• Cervical to thoracolumbar transition constructs
• Long-segment spinal fixation
• Complex deformity correction
• Revision spine surgeries