Definition of Titanium rod for bone screws
Titanium rod for bone screws are the core raw material for manufacturing orthopedic internal fixation screws (such as cortical bone screws, cancellous bone screws, hollow screws, locking screws, etc.). Ti-6Al-4V/ELI is the mainstream material, which has four core advantages: biocompatibility, mechanical compatibility, corrosion resistance, and machinability. It is the preferred metal material for orthopedic internal fixation.
Titanium rods for bone screws are one of the core materials in modern orthopedic internal fixation surgery, widely used in fracture fixation, spinal fusion, joint reconstruction, and other surgeries. They are typically used in conjunction with titanium alloy screws, bone plates, and other components to form a stable internal fixation system, providing strong support for bone healing.
Commonly used material grades and compositions
**Mainstream Grades (Most Commonly Used in Orthopedic Screws)
Ti-6Al-4V, US Standard GR5
Composition: Ti-6Al-4V (Al: 5.5–6.5%, V: 3.5–4.5%, balance Ti)
Features: High strength, good overall performance, used for load-bearing/high-load screws (such as locking screws, spinal pedicle screws)
Ti-6Al-4V ELI, US Standard GR23
Composition: Ultra-low gap element version (O≤0.13%, N≤0.03%, H≤0.0125%)
Features: Highest medical grade, higher purity, better biocompatibility, superior fatigue performance, used for screws with long-term implantation and high safety requirements
Pure Titanium (GR1/GR2)
Composition: Industrial pure titanium (Ti≥99.5%)
Features: Excellent corrosion resistance, lower strength, used for non-load-bearing/low-load screws (such as small fractures, soft tissue fixation)
**Novel Low-Modulus Alloys (Trend)
Ti-6Al-7Nb, Ti-13Nb-13Zr, Ti-15Mo
Features: Lower elastic modulus (70–85 GPa), closer to human bone (10–30 GPa), reduces stress shielding, promotes bone healing
Key performance (core requirements for orthopedic screws)
1. Biocompatibility (Primary Safety Indicator)
A stable, non-toxic, non-sensitizing, and non-carcinogenic TiO₂ oxide film naturally forms on the surface.
Complies with all ISO 10993 biosafety tests, with cytotoxicity ≤1.
Can integrate with bone tissue, reducing the risk of loosening and rejection.
2. Mechanical properties (load-bearing capacity and durability)
| Performance indicators | Grade 5 | TI6AL4V ELI(GR23) | CP Ti Gr2 | Human bones (for reference) |
|---|---|---|---|---|
| tensile strength | ≥895MPa | ≥860MPa | ≥485MPa | cortical bone≈100–200MPa |
| Yield strength | ≥825MPa | ≥795MPa | ≥345MPa | - |
| elongation | ≥10% | ≥10% | ≥18% | - |
| elastic modulus | 110GPa | 110GPa | 105GPa | 10–30GPa |
| Fatigue intensity (10⁷ cycles) | ≥500MPa | ≥550MPa | - | - |
*** Key advantages: Elastic modulus close to that of human bone, significantly reducing "stress shielding" (excessive stress on the implant leading to bone resorption and loosening).
3. Corrosion Resistance (Long-term Stability in Vivo)
Corrosion rate in body fluids, blood, and acidic/alkaline environments < 0.001mm/year, with virtually no ion release.
Far superior to stainless steel and cobalt-chromium alloys, suitable for lifelong implantation.
4. Machinability (Essential for Screw Manufacturing)
Can be cut, cold-headed, thread-rolled, heat-treated, and surface-treated.
High dimensional accuracy: tolerances up to **±0.015mm**, meeting the requirements for precision machining of screw threads and heads.
Surface roughness: medical-grade Ra≤0.4μm, reducing tissue irritation and promoting bone attachment.
Specifications and dimensions of Titanium rod for bone screws
- Diameter: Φ1.0–Φ12mm (screws commonly use Φ2.0–Φ6.5mm)
- Length: 10–6000mm (custom lengths available)
- Condition: Annealed (M), Solution-Aged (STA)
- Surface: Polished (Ba), Machined (Mc)
Core performance advantages of Titanium rod for bone screws
1. Excellent Biocompatibility: Titanium rods are less likely to cause rejection after implantation. A dense oxide film (TiO₂) naturally forms on their surface, effectively isolating them from bodily fluid corrosion and promoting bone cell growth, achieving osseointegration. This characteristic makes titanium rods an ideal choice for long-term implantation.
2. High Strength and Lightweight Combination: Titanium alloys have a density of approximately 4.5 g/cm³, only about half that of steel, yet their strength can reach over 80% of ordinary steel, achieving a "light and strong" mechanical balance. This not only reduces the postoperative burden on patients but also minimizes stress shielding effects on surrounding bone tissue, aiding in natural bone recovery.
3. Strong Corrosion Resistance: Even in the chloride-rich bodily fluid environment, titanium rods remain highly stable, with an annual corrosion rate far lower than stainless steel, ensuring long-term safety.
4. Good X-ray Transmittance: Titanium alloys cause minimal interference with X-ray and MRI examinations, facilitating postoperative imaging follow-up. Doctors can clearly observe fracture healing and the condition of tissues surrounding the implant.
Products showcase of Titanium rod for bone screws
About our company
Baoji Reliab Metal Material Co.,Ltd is a professional manufacturer and supplier of Titanium mill products and Nickel,Zirconium products. With high quality controlling system, our products meeting the international standard as ASTM, ASME, AMS, JIS, DIN, TOCT, our main products including bars/rods, plates/sheets, tubes, wires, forgings rings, anodes, fasteners and CNC machined parts.
For over 12 years,Baoji Reliab Metal Material has grown as one of the steady suppliers for aerospace-grade titanium and medical-grade titanium products field in China.
how to contact us
E-mail: garychen3215@hotmail.com
Address: No.35, Baoti Rd, Baoji city, Shaanxi Province, China
Contact: Mr. Gary Chen
Phone: +86-917-8883215
Mobile/WhatsApp: +86 13092900605
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