Hip Replacement Technology


Ceramic Materials Offer the Potential for a Longer-Lasting Hip Replacement

Conventional hip replacement systems use an insert made of plastic and a head made of metal. Over time, these components may wear as the parts move back and forth with normal joint use. Eventually, this may lead to the joint wearing out, and an additional surgery or “revision” is needed to replace the worn-out joint.

As total hip replacement becomes more common in younger and more active patients, and as patient life expectancies continue to increase, the orthopaedic industry has been challenged to extend the life span of total hip replacement components.

The clinical use of ceramic as a bearing surface dates back to the early 1970s. In 1995, an improved alumina ceramic was developed that had increased purity and strength over the first generation materials. The type of ceramic used in total hip replacement today is aluminum oxide, also known as alumina.

The extreme hardness of this type of ceramic offers greater scratch resistance than the conventional implants used in conventional hip replacements. Ceramic-on-ceramic surfaces have demonstrated significantly lower wear versus conventional plastic-on-metal hip systems in the laboratory. Therefore, it is anticipated that these improved wear characteristics may extend the life of the implant.

The best type of replacement for you depends on your medical condition, activity level, and age. Talk to your orthopaedic specialist to find out if a ceramic-on-ceramic hip replacement is right for you.

Delta Ceramics and X3® Advanced Bearing Technology

Latest Advances in Bearing Materials

Many things including patient weight, activity level, and implant bearing surface can affect the durability of a hip implant. The bearing surface is defined as the two parts of the artificial hip that glide together throughout motion. In total hip surgery, the bearing surfaces are called the femoral head and the acetabular insert. A variety of materials are available for each of these components, including cobalt chrome metals, plastics, and ceramics. Over 90% of patients receiving hip replacements achieve complete relief from pain and significant improvement in joint function. However, artificial hips are still subject to wear and this wear may affect the long-term life of an implant. In recent years, there have been significant advances in bearing materials which are designed to extend the life of the implants. You should talk to your physician about the best implant for you.

Delta Ceramic Femoral Heads

Femoral heads have been traditionally manufactured from stainless steel, cobalt chrome or alumina ceramic. Biolox® delta is an alternative to conventional implants that also yields potential benefits of strong, longer wearing ceramics. Biolox® delta is biocompatible, scratch resistant and resists wear like alumina ceramic, but also provides additional strength.

In laboratory testing, Biolox® delta ceramic is up to 50% stronger than alumina ceramic. The strength comes from an advanced type of ceramic that’s used to manufacture Biolox® delta, which is what gives it a pinkish color. The strength of this material allows manufacturing of increased sizing of femoral heads so your surgeon has a broader implant selection to provide the implant that fits you best.

X3® Advanced Bearing Technology for Hips

Crosslinking is an advanced method of manufacturing polyethylene that helps improve the wear performance of the plastic insert used in total hip replacement. Acetabular inserts made from the X3® technology include special processing which contributes to its wear resistance.

The X3® bearing technology is a new, advanced polyethylene implant which has demonstrated extremely low wear in the laboratory and may have similar wear performance clinically. Through Stryker’s patented manufacturing process, X3® has demonstrated a 97% wear reduction over conventional polyethylene in laboratory testing.2 This decrease in wear may extend the life of your implant.

Delta Ceramic with X3® Bearing Technology

The excellent wear characteristics of Biolox® delta and X3® Advanced Bearing Technology provide an extremely durable bearing surface for total hip replacement, which may be important for younger, more active patients.

The Trident® Ceramic Hip Replacement System

In 1999, Stryker advanced the design of hip implants with the ceramic-on-ceramic and titanium hip, representing the latest innovations in this technology with the Trident® hip replacement system. Unlike conventional hip replacement systems, the Trident® System utilizes alumina ceramic-on-ceramic surfaces rather than metal-on-plastic or metal-on-metal. Ceramic-on-ceramic components have demonstrated significantly lower wear versus the conventional systems in the laboratory. Therefore, it is anticipated that these improved wear characteristics will potentially extend the life of the implant.

The Trident® Ceramic System is a cementless system, which means that the materials are fixed to the bone through implant design and technique, rather than using bone cement. Additional technology such as arc deposition and hydroxyapatite (HA) coating are an essential part of the shell design.

Range of motion for the Trident® Ceramic System

Many people are concerned that they’ll experience a more limited range of motion following total hip replacement. Most want to regain sufficient motion so that they can return to everyday activities, such as climbing stairs and sitting or bending to tie their shoelaces, without concern for dislocation. Although there are many factors that will influence your range of motion, the Trident® Ceramic System is designed to accommodate the range of motion of a normal, healthy hip joint. An increased range of motion may minimize the risk of hip dislocation.

Advantages of the Trident® Ceramic System
  • Potential to wear less, last longer

    The insert and head of the Trident® System are both alumina ceramic, which has demonstrated significantly lower wear versus conventional plastic-on-metal joint systems in the laboratory. It is anticipated that the improved wear characteristics of alumina ceramic may result in a longer lasting implant.

  • It’s stronger than other ceramic hip systems on the market

    The Trident® Ceramic System has a unique design that features a patented titanium sleeve surrounding the ceramic acetabular shell. The titanium sleeve increases the material strength of the ceramic insert by 50% versus other available ceramic inserts.

  • Biocompatible

    The type of ceramic used in total hip replacement today is aluminum oxide, also known as alumina. Alumina ceramic is extremely compatible with the body.