Our 4.5mm Cortical Screw range represents a foundation of rigid internal fixation in large fragment orthopedic trauma surgery. Engineered with a dense, shallow-pitch thread profile, these screws are specifically optimized to achieve maximum purchase, high pull-out resistance, and stable compression within hard cortical bone.
Featuring a highly efficient self-tapping tip with sharp cutting flutes, these screws cleanly cut their own path through the bone cortex, reducing operating room times by eliminating the need for independent pre-tapping. The countersunk, low-profile head contains a deep internal hexagonal drive socket that maximizes torque transmission while sitting flush against bone plates to protect surrounding soft tissues.
Key Features & Benefits
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Fully Threaded Cortical Profile: Precision-machined, shallow-pitch threads designed to maximize surface-area engagement and anchoring power in dense cortical bone.
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Advanced Self-Tapping Tip: Sharp, fluted cutting tip allows the screw to thread itself directly into pre-drilled holes without requiring a separate bone tap.
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High-Torque Hexagonal Drive: A deep internal hex socket guarantees positive driver engagement, eliminating driver slippage (cam-out) and preventing head stripping during insertion or removal.
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Low-Profile Countersunk Head: The tapered, flush-fitting head design integrates seamlessly into standard large fragment dynamic compression plates (DCP) and limited-contact plates (LC-DCP), minimizing post-operative soft-tissue friction.
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Comprehensive Length Matrix: Available in a high-demand sizing array including 30mm, 32mm, 34mm, 36mm, 38mm, and 40mm options to perfectly accommodate variable patient anatomy.
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Elite Biocompatibility: Crafted from premium medical-grade Titanium Alloy or Stainless Steel to ensure superior fatigue resistance and long-term biological safety.
Technical Specifications
| Feature | Specification |
| Screw Diameter | 4.5mm |
| Drive Type | Hexagonal (Hex) Socket |
| Thread Configuration | Fully Threaded |
| Thread Type | Cortical (Dense, shallow pitch) |
| Tip Design | Self-Tapping with cutting flutes |
| Head Design | Countersunk / Tapered |
| Material Options | Titanium Alloy (Ti-6Al-4V) / Medical Grade Stainless Steel (316L) |
| Available Lengths | 30mm, 32mm, 34mm, 36mm, 38mm, 40mm (Extended sizes available) |
| Sterilization | Delivered Non-Sterile (Autoclavable) |
Clinical Indications
The 4.5mm Cortical Screw system is primarily indicated for:
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Fixation of large bone fractures, including the femoral shaft, humeral shaft, and tibial shaft.
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Securing large fragment compression plates, neutral plates, and buttress plates to cortical bone segments.
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Interfragmentary lag screw fixation when used in combination with an over-drilling technique.
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