## Introduction
In the demanding world of orthopedic surgery, the choice of material determines the long-term success of an implant. While many metals have been tested, **Ti6Al4V ELI (Extra Low Interstitial), also known as Grade 23**, has emerged as the definitive gold standard for permanent orthopedic hardware.
## What Makes Grade 23 “ELI”?
“ELI” stands for Extra Low Interstitial elements. Compared to standard Grade 5 titanium, Grade 23 has strictly controlled levels of oxygen, nitrogen, and carbon.
* **Improved Ductility:** Lower oxygen levels make the metal less brittle and more resistant to cracking under stress.
* **Superior Fatigue Strength:** Critical for weight-bearing implants like femoral stems or bone plates that must endure millions of cycles.
## Key Properties for Orthopedics
1. **Biocompatibility:** Titanium naturally forms a stable oxide layer that prevents corrosion and encourages bone cells to attach (osseointegration).
2. **Modulus of Elasticity:** At ~110 GPa, it is much closer to human cortical bone (~20 GPa) than stainless steel (~200 GPa). This reduces the risk of **Stress Shielding**.
3. **Corrosion Resistance:** Highly resistant to the salty, acidic environment of human body fluids.
## Ortholyx Quality Commitment
Ortholyx sources only medical-grade Ti6Al4V ELI that meets **ASTM F136** standards. Every batch is traceable and verified through chemical and mechanical testing to ensure surgeon peace of mind.
## Conclusion
Ti6Al4V ELI Grade 23 provides the perfect balance of strength, safety, and durability. By utilizing this premium alloy, Ortholyx ensures that every implant is engineered for a lifetime of performance.