Materials & Applications

Everything About Titanium for Orthopedic Implant Applications

Titanium for Orthopedic Implant Applications

Shoulder joints, hip sockets, dental implants or hearing aids: the medical industry has been using titanium in all manner of medical applications since the 1950s. The natural properties of this strong and corrosion-resistant element make it reliable and completely biocompatible.

What is even more fascinating about titanium is that it promotes osseointegration by physically bonding with the bone around which it is placed, without the need for an extra adhesive.

Titanium implants resist high energy forces without breakage, don’t react to bodily environments and last longer than many other materials.

Metals in orthopedic implants through the ages

Humans have been using metallic materials to replace body parts and to treat fractures for over a century. Earlier applications with lead, aluminum, silver and gold have since been abandoned as the materials proved too weak for long-lasting uses.

Steel, iron, nickel, copper and zinc implants used between 1920 and 1950 led to adverse bodily reactions. Titanium first gained popularity in the dental industry in the 1940s and quickly found its way into orthopedics in the 1950s.

Today, it is the go-to material for internal fixation, inner-body devices, prosthetics and medical instruments.

Hip joint replacement made from titanium

Properties of titanium alloys used in medicine

In its pure form, titanium features:

  • low density,
  • high strength
  • high level of corrosion resistance
  • It is also non-magnetic and non-toxic, two properties that are particularly advantageous for application in biomedical materials.
  • Its coefficient of thermal expansion and modulus of elasticity both resemble that of human bone.
  • Pure titanium is the most corrosive-resistant form of titanium on the medical market and is frequently used when ductility and malleability is key.

Alloys come into play when strength to weight ratio is vital to the success of the implant. Most interestingly, titanium connects very well to human tissue and bone.

The most common alloys used in medical and dental implants are Titanium 6AL4V / Titanium 6Al4V ELI – alpha-beta alloys containing approximately 90% titanium, 6% aluminum and 6% vanadium. They facilitate a high level of fracture resistance and work in harmony with the body to promote osseointegration.

titanium in orthopedic implants

Osseointegration: titanium is adhesive and non-corrosive

Any implant inserted into the body is treated as an assault, and the tissue surrounding the implantation site is highly sensitive. Titanium is completely inert, thanks to its protective oxide film formed naturally upon exposure to oxygen. It is also completely resistant to fluid and tissue corrosion; therefore it won’t be rejected by the body. Titanium bonds well with human bone because it has a high dielectric constant.

Other types of biomaterials may require adhesives to connect with bone and tissue, but titanium facilitates this process naturally, a benefit not found in any other metal. Once the bond is formed, only a very high force can succeed in breaking it.

Heads and shoulders, knees and toes

Surgical instruments such as forceps, dental drills and laser electrodes often contain titanium because it is resistant to bacteria, compatible with radiation, durable yet lightweight and non-corrosive. Neurosurgical applications include cranial plates, acrylic and mesh. Children’s titanium rib cages facilitate expansion as the body grows.

Finally, titanium is the biomaterial of choice around the world for hip and knee replacements, as well as elbow and shoulder joint replacements. Bone screws, plates, staples, mesh and cables made of titanium support broken bones and facilitate fixation.

Want to know more about titanium? Try searching for titanium on Matmatch and find about more about its properties.

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3 Comments Add New Comment

  1. It’s interesting to learn that titanium can not only be used in construction and aviation but also in orthopedic replacements! Interestingly, that is because titanium is completely inert making it perfect for osseointegration. It is both adhesive and non-corrosive. I wonder what else can Titanium be used for. I’ll try looking more into this versatile material. Thanks for the interesting read on the application of titanium in orthopedic replacements!

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