Joint Replacement Center for Hips, Knees, and Shoulders

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What makes a Stryker
Hip Replacement Different?

Stryker is dedicated to developing artificial hips and surgical procedures based on scientific solutions to real-life problems -- allowing surgeons to match each replacement joint to a patient's specific needs. Continue reading...

Latest Advances in Bearing Materials

Over 90% of patients receiving hip replacements achieve complete relief from pain and significant improvement in joint function.1 However, a patient's weight and activity level affect how long a hip implant will last, as does the implant bearing surface (the portions of the artificial hip that glide together when you move).

Stryker has developed an innovative hip replacement material known as X3® polyethylene, which has demonstrated a 97% wear reduction over conventional polyethylene in laboratory testing.5 This decrease in wear may extend the life of your hip implant. X3® is the next generation in performance improvements, offering:

  • Improved strength2,3
  • Decreased wear as compared to conventional materials4,5
  • Oxidation resistance similar to conventional materials6,7

The Trident® Ceramic Hip System

New ceramic-on-ceramic joint replacements are designed to meet the greater demands of younger, more active patients and reduce the potential for early joint failure.

Unlike conventional hip implants, the Trident® system utilizes alumina ceramic-on-ceramic surfaces rather than metal-on-plastic or metal-on-metal. Ceramic-on-ceramic artificial joints have been shown to significantly lower wear versus conventional systems in the laboratory.9 It is expected that these improved wear characteristics may extend the life of the implant.

The Trident® Ceramic System allows the implant to be fixed to the bone through implant design and technique, rather than using bone cement, thereby potentially improving long-term performance.

Potential benefits of the Trident® Ceramic Hip System include:

  • Less wear
  • Increased durability
  • Stronger than other ceramic inserts on the market
  • Consistent performance

Fit and Performance

As with any state-of-the-art technology, physicians and scientific engineers continually strive to make hip replacements more successful by reducing the potential incidence of complication and improving the performance of the implant. Although infrequent, one complication is the risk of hip dislocation after surgery. Three to 4 percent of patients receiving a total hip replacement experience hip dislocation.8 To help prevent dislocation, your doctor will ensure that the size of the implant closely matches the size and shape of your body. Stryker's hip components are sized for natural-like hip performance. The result is a total hip replacement designed to help minimize dislocation and increase your range of motion.

Next > Use the Physician Locator to find a Stryker surgeon near you

References

  1. healthatoz.com website, Aug. 2006.
  2. Wang, A,Manley, M, Serekian, P, "Wear and Structural Fatigue Simulation of Crosslinked Ultra-High Molecular Weight Polyethylene for Hip and Knee Bearing Applications," Crosslinked and Thermally Treated Ultra-High Molecular Weight Polyethylene for Joint Replacements, ASTM STP1445, S.M. Kurtz, R. Gsell, and J.Martell, Eds., ASTM International, West Conshohecken, PA, 2003, pp. 151-168.
  3. Essner, A, et. al., "Acetabular Liner Function Fatigue Performance of Crosslinked UHMWPE," 51st Annual ORS paper No. 0245,Washington, DC, 2005.
  4. Stryker Orthopaedics Trident® Acetabular Inserts made of X3® UHMWPE, 721-00-32E, show a 97% reduction in volumetric wear rate versus the same insert fabricated from N2/VacT gamma sterilized UHMWPE, 620-00-32E. The insert tested was 7.5 mm thick with an inner diameter of 32 mm. Testing was conducted under multi-axial hip joint simulation for 5 million cycles using a 32mm CoCr articulating counterface and calf serum lubricant. X3® UHMWPE Trident Acetabular Inserts showed a net weight gain due to fluid.
  5. Stryker Orthopaedics Test Report: RD-03-082.
  6. X3® UHMWPE maintains mechanical properties after accelerated oxidative aging. No statistical difference was found for Tensile Yield Strength, Ultimate Tensile Strength and Elongation as measured per ASTM D638 before and after exposure to ASTM F2003 accelerated aging (5 Atmospheres (ATM) of oxygen at 70°C for 14 days). Tensile Yield Strength was 23.5 ± 0.3 MPa and 23.6 ± 0.2 MPa, Ultimate Tensile Strength was 56.7 ± 2.1 MPa and 56.3 ± 2.3 MPa and Elongation was 267 ± 7 % and 266 ± 9 % before and after accelerated oxidative aging, respectively.
  7. X3® UHMWPE resists the effects of oxidation. No statistical difference was found for Tensile Yield Strength, Ultimate Tensile Strength, Elongation, Crystallinity and Density as measured per ASTM D638, D3417 and D1505 before and after ASTM F2003 accelerated aging (5 ATM of oxygen at 70°C for 14 days). Tensile Yield Strength was 23.5 ± 0.3 MPa and 23.6 ± 0.2 MPa, Ultimate Tensile Strength was 56.7 ± 2.1 MPa and 56.3 ± 2.3 MPa, Elongation was 267 ± 7 % and 266 ± 9 %, Crystalllinity was 61.7 ± 0.6 % and 61.0 ± 0.5 % and Density was 939.2 ± 0.1 kg/m3 before and after accelerated oxidative aging, respectively.
  8. Sanchez-Sotelo, J., et al.,"Hospital cost of Dislocation After Primary Total Hip Arthroplasty," Journal of Bone and Joint Surgery,May 30, 2006, pg.290.200
  9. Taylor SK, Serekian P, Manley M, "Wear Performance of a contemporary Alumina: Alumina Bearing Couple under Hip Joint Simulation," Trans. 44th Ann. Mtg. ORS, 51, 1998.

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