X-alt Polyethelene

• about
• manufacturing
• wear
• material integrity
• large diameters
• references
• faqs
• glossary
• resources

hip products

press fit stems

• CLP Hip Stem
• Foundation Total Hip System
• Revelation Hip System
• Keystone Revision Hip System
• Linear Total Hip System
• R120PC Modular Stem
• ALFA II Modular Stem

cemented stems

• Foundation Total Hip System
• R120 Modular Stem

modular stems

• Keystone Revision Hip System
• ALFA II Modular Stem
• R120 Modular Stem

revision stems

• Keystone Revision Hip System
• ALFA II Modular Stem

acetabular systems

• Keramos Ceramic Hip
• FMP Acetabular System
• MIS Instruments
• X-alt HXL Poly

bearing options

• Keramos Ceramic hip
• Metal/Metal CoCr
• FMP Acetabular System
• X-alt HXL Poly

technology

• 3DMatrix
• X-alt HXL Poly

Wear

Stability Against Wear

Crosslinked to address the number one cause of THA failure.

Wear-induced osteolysis is caused by the body’s inflammatory reaction to polyethylene wear debris. Subsequent implant loosening is the number one cause of total hip failure. Highly crosslinked polyethylene shows dramatically reduced wear in hip simulator tests, and these results have been validated clinically.^{1 2 3 4 5 6}

Significant Wear Reduction

Independent wear tests of X-alt™ highly crosslinked polyethylene inserts were conducted at Loma Linda University, a lab with over 25 years of experience in orthopedic tribology. After 6.5-million cycles, representing approximately 7 years in vivo, the 44mm X-alt liners demonstrated an average of 87% less wear than the 32mm control liners.⁷ Historically, increasing head size meant increasing wear ⁸; these results show that even for a much larger head, X-alt highly crosslinked polyethylene has a drastically lower wear rate.

Pin-on-disc Wear Rates for UHMWPE Irradiated to different Doses ²²

Wear rate decreases steeply with increasing radiation dose until about 7.5 Mrad, after which increasing dose gives smaller improvements in wear rate.