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Stryker Corporation  (SYK) Knee and Hip Implants Demonstrate Lowest Revision Rates, According to the National Joint Registry for England and Wales


2/16/2011 6:56:58 AM

MAHWAH, N.J., Feb. 16, 2011 /PRNewswire/ -- Stryker Corporation's Orthopaedics division today announced at the 2011 American Academy of Orthopaedic Surgeons annual conference the findings of the National Joint Registry for England and Wales, which reports that Stryker's Trident® Cup, Accolade® Hip Stem and Triathlon® Knee System outperformed all competitive products in terms of revision rates for the most frequently used brands.(1,2,3)

"Stryker Orthopaedics focuses on developing products that can address the clinical issues that are most critical to implant performance," said Mike Mogul, Group President, Stryker Orthopaedics. "The National Joint Registry of England and Wales is incredibly important because it demonstrates the performance of implants on the market today and provides surgeon and hospital customers with valuable data, enabling them to make informed purchasing decisions to enhance clinical outcomes."

The 2010 National Joint Registry of England and Wales data revealed that Stryker's Trident® Cup, Accolade® Hip Stem and Triathlon® Knee System all showed the lowest rate of revision when compared with the most frequently used implant systems. According to the registry, Trident® had the lowest revision rate (2.4%) among cementless cups at five years, Accolade® had the lowest revision rate (2.8%) among cementless stems at five years, and Triathlon® had the lowest revision rate (1%) among total knee replacement systems at three years for the second year in a row. (1,2,3)

The Trident® Acetabular System features a patented locking mechanism that outperforms competitive designs(4) in regards to micromotion between cup and liner, and is designed to minimize back-side wear(4) while maximizing jump distance for increased stability(5). Compatible with Stryker's patented X3® Advanced Bearing Technology, Trident® X3® has demonstrated a 97% reduction in wear compared to conventional polyethylene(6).

The Accolade® Femoral Hip System features a clinically successful tapered wedge stem and streamlined instruments that promote surgical simplicities. With over 10 years of clinical history and 300,000+ implantations, the Accolade® System has proven clinical performance(1,7).

The Triathlon® Knee System features a single-radius design to promote stability(8) and combined with Stryker's patented X3® Advanced Bearing Technology, Triathlon® has demonstrated has demonstrated a 96% decrease in wear in laboratory testing compared to competitive premium bearing technology.(9) Based on this testing, X3® Technology may result in a longer lasting implant.

About Stryker Orthopaedics

Stryker Orthopaedics is a division of the Stryker Corporation, one of the world's leading medical technology companies. Stryker Orthopaedics offers an extensive orthopaedic product portfolio including hip, knee and upper extremity reconstructive devices, bone cement, trauma implants, bone substitutes and spine systems. For more information about Stryker Orthopaedics, visit: http://www.stryker.com/enus/products/Orthopaedics/index.htm.

About Stryker

Stryker is one of the world's leading medical technology companies and is dedicated to helping healthcare professionals perform their jobs more efficiently while enhancing patient care. The Company provides innovative orthopaedic implants as well as state-of-the-art medical and surgical equipment to help people lead more active and more satisfying lives. For more information about Stryker, please visit www.stryker.com.

References:

1. The National Joint Registry of England and Wales, Annual Report 2010. Table 3.3. Based on revision rates according to stem brands for primary hip replacement procedures, undertaken between 1st April 2003 and 31st December 2009, which were linked to a HES/PEDW episode.


2. The National Joint Registry of England and Wales, Annual Report 2010. Table 3.4. Based on revision rates according to cup brands for primary hip replacement procedures, undertaken between 1st April 2003 and 31st December 2009, which were linked to a HES/PEDW episode.


3. The National Joint Registry of England and Wales, Annual Report 2010. Table 3.11. Based on mean revision rates according to brands for primary knee replacement procedures, undertaken between 1st April 2003 and 31st December 2009, which were linked to a HES/PEDW episode.


4. Litsky, AS, et al., "Micromotion between the cup and the Liner in Modular Acetabular Prostheses," 1999 Society for Biomaterials, 25th Annual Meeting Transactions.


5. Nevelos, J., Bhimji, S., Macintyre, J., et al. (2010). Acetabular Bearing Design Has a Greater Influence on Jump Distance than Head Size. 56th Annual ORS Meeting: Poster #2028.


6. 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 7.5mm thick with an inner diameter of 32mm. 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 absorption phenomena but yielded a positive slope and wear rate in linear regression analysis. Volumetric wear rates were 46.39 +/- 11.42mm3/106 cycles for N2\Vac gamma sterilized UHMWPE inserts and 1.35 +/- 0.68mm3/106 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. a, b, c

a. Wang, A., et al., Tribology International, Vol. 31, No. 1-3:17-33, 1998.

b. Essner, A., et al., 44th Annual Meeting, ORS, New Orleans, Mar. 16-19,

1998:774.

c. Essner, A., et al., 47th Annual Meeting, ORS, San Francisco, Feb. 25-28,

2001:1007.


7. Lettich T, et al. Primary Total Hip Arthroplasty with an Uncemented Femoral Component: Two- to Seven-Year Results. JOA. Vol. 22. No. 7 Suppl. 3 2007.


8. Wang, Mahoney, et al. A biomechanical comparison between the single-axis and multi-axis total knee arthroplasty systems for the stand-to-sit movement. Clin. Biomech. 20 (2005) 428-433.


9. Stryker Orthopaedics Test Report RD-06-013.



Contact:

Jeanine Guilfoyle

Jon Stone


Stryker Orthopaedics

Kwittken & Company


201-831-6277

646-747-7161


jeanine.guilfoyle@stryker.com

stryker@kwitco.com





SOURCE Stryker Orthopaedics


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