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X3^® with Advanced Bearing Technology

X3^® with Advanced Bearing Technology

Latest Technology in Wear Performance

Many things including patient weight, activity level as well as the implant’s bearing surface technology, can affect the longevity of the implant. The bearing surface is defined as the two parts of the joint replacement that glide together throughout motion. Stryker’s new, advanced bearing technology, called X3^®, has been shown to significantly reduce wear in laboratory testing. This decrease in wear may contribute to the longevity of your implant. This technology is only available from Stryker.

Learn more about:

• Knee Replacements using X3^®
• Hip Replacements using X3^®

 

 

 

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• Wang A, Manley M, Serekian P. “Wear and Structural Fatigue Simulation of Crosslinked Ultra-High Molecular Weight Polyethylene for Hip and Knee Bearing Applications.” In: Kurtz SM, Gsell R, and Martell J, eds. Crosslinked and Thermally Treated Ultra-High Molecular Weight Polyethylene for Joint Replacements; ASTM STP1445. West Conshohocken, PA: ASTM International; 2003:151-168.
• Stryker^® Orthopaedics Test Report: RD-03-082.
• Stryker^® Orthopaedics Triathlon™ CR Tibial Inserts made from X3® UHMWPE, 5530-G-409 show a 68% reduction in volumetric wear rate versus the same insert fabricated from N2\Vac™ gamma sterilized UHMWPE, 5530-P-409. The insert tested was 4, 9 mm thick. Testing was conducted under multiaxial knee simulator (multi-station MTS knee joint simulatora) for five million cycles using appropriate size CoCr counterfaces, a specific type of diluted calf serum lubricant and the motion and loading conditions, representing normal walking, outlined in ISO/DIS 14243-3. Volumetric wear rates were 17.7 ± 2.2 mm3/106 cycles for standard polyethylene inserts and 5.7 ± 1.5 mm3/106 cycles for test samples. Test inserts were exposed to a gas plasma sterilization process. In-vitro knee wear simulator tests have not been shown to quantitatively predict clinical wear performance.^a
• Stryker^® Orthopaedics Triathlon™ PS Tibial Inserts made of X3^® UHMWPE, 5532-G-409 show a 64% reduction in volumetric wear rate versus the same insert fabricated from N2\Vac™ gamma sterilized UHMWPE, 5532-P-409. The insert tested was Size 4, 9 mm thick. Testing was conducted under multiaxial knee simulator (multi-station MTS knee joint simulatora) for five million cycles using a size 7 CoCr counterfaces, a specific type of diluted calf serum lubricant and literature or fluoroscopy based motion and loading conditions representing stair climbing.^b,c Volumetric wear rates were 3.6 ± 0.61 mm3/106 cycles for standard polyethylene inserts and were 1.3 ± 0.44 mm3/106 cycles for test samples. Test inserts were exposed to a gas plasma sterilization process. In vitro knee wear simulator tests have not been shown to quantitatively predict clinical wear performance.^a
• Stryker^® Orthopaedics Trident^® Acetabular Inserts made of X3^® UHMWPE (unsterilized), 721-00-32E, show a 97% reduction in volumetric wear rate versus the same insert fabricated from N2\Vac™ 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 32 mm CoCr articulating counterface and calf serum lubricant. X3^® UHMWPE Trident^® acetabular inserts showed a net weight gain due to fluid absorption phenomena but yielded a positive slope and wear rate in linear regression analysis. Volumetric wear rates were 46.39 ± 11.42 mm3/106 cycles for N2\Vac™ gamma sterilized UHMWPE inserts and 1.35 ± 0.68 mm3/106 cycles for X3^® UHMWPE (unsterilized) Trident^® Acetabular Inserts. Although in-vitro hip wear simulation methods have not been shown to quantitatively predict clinical wear performance, the current model has been able to reproduce correct wear resistance rankings for some materials with documented clinical results.^d,e,f
  • a. Essner A, et. al. “A simulator for the evaluation of total knee replacement wear”, 5th World Biomaterials Congress, Toronto, Canada, May 1996, pg 580.
    b. Riener R, et. al. “Stair ascent and descent at different inclinations”, Gait and Posture 15: 2002, pg. 32-44.
    c. Morrison JB. "Function of the knee joint in various activities", Biomedical Engineering, 4: 1969, pg. 573-580.
    d. Wang A, et al. Tribology International, Vol. 31, No. 1-3:17-33, 1998.
    e. Essner A. et al. 44th Annual Meeting, ORS, New Orleans, Mar. 16-19, 1998:774.
    f. Essner A. et al. 47th Annual Meeting, ORS, San Francisco, Feb. 25-28, 2001:1007.