Hip Arthroplasty

Hip cups offer a great example of how our biomaterials can help improve wear performance and delivery anatomical fit.

Our durable biomaterial addresses the need for new, longer-lasting designs for younger and more active patients. Excellent wear resistance and exceptional structural strength make it an ideal choice for hip cups that support bone-conserving concepts.1, 2, 3

PEEK-OPTIMA Wear Performance offers an alternative load-bearing material to metal designed to address metal ion concerns. It features a modulus similar to human bone, which reduces stress shielding and leads to improved physiological loading.4

PEEK-OPTIMA Wear Performance accommodates both standard and new implant fixation technologies. It is radiolucent and compatible with common imaging technologies. This allows improved visualisation for placement and post-operative follow up in the months and years after surgery.5

  • An acetabular cup bearing against a 54mm ceramic head showed a wear rate of approximately 1mm3/million cycles;1
  • Screening tests and hip and knee simulator tests indicate that extremely low wear can be achieved against metal and ceramic counterfaces.2
  • Implantation in a clinical trial as an a acetabular liner produced no adverse reports of wear biocompatibility.4
  • Use as a very thin acetabular bearing provides anatomical stress distributions; fixation has been achieved by titanium and/or hydroxyapatite coatings5

References:

  1. Scholes, S. C., Inman, I. A., Unsworth, A., Jones, E. Tribological assessment of a flexible carbon-fiber-reinforced poly (ether-ether-ketone) acetabular cup articulating against an alumina femoral head. Proc. Instn. Mech. Engrs. Part H, Journal of Engineering in Medicine, Vol. 222, Number 3, 2008, pp. 273-283(11).
  2. Scholes, S. C. and Unsworth, A. Pitch-based carbon-fiber-reinforced poly (ether–ether–ketone) OPTIMA™ assessed as a bearing material in a mobile bearing unicondylar knee joint. Proc. Instn. Mech. Engrs. Part H, Journal of Engineering in Medicine, Vol. 223, H1, 2009, pp. 13-26.
  3. Pace, N., Spurio, S., Pavan, L., Rizzuto, G., and Strecher, R.M. Clinical Trial of a New CF-PEEK Acetabular Insert in Hip Arthroscopy. Abstracts from the European Hip Society 2002 Domestic Meeting.
  4. Manley, M., Ong, K., Kurtz, S., Rushton, N., and Field, R. Biomechanics of a PEEK horseshoe-shaped cup: Comparisons with a predicate deformable cup. Paper C655/058. Institution of Mechanical Engineers, “Engineers & Surgeons: Joined at the Hip,” London, April 19-21, 2007.
  5. Supportive information available on request.

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