White Papers

Surface Guided Knee White Paper
Testing and Validation of a Patient-specific, Surface-guided Total Knee Replacement

Orthopaedic Innovation Centre

The white paper describes the extensive development of the technology as well as results of numerous validation tests performed on a surface-guided knee prototype. These works, which have been published in numerous peer-reviewed journals, demonstrate the superiority of the design in terms of:

  • Guided, patient-specific knee kinematics with more precise implant fit
  • High range of motion with up to 155° of flexion, up to 22° external rotation of the femur, and 12 mm of femoral rollback
  • Joint stability without relying on ligaments
  • Low articular surface pressure which reduces risk of polyethylene damage and lowers wear rate

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    White Paper
    Pilot Study: The Effect of Femoral Head Roughening Techniques on Polyethylene Wear in Total Hip Replacements

    Orthopaedic Innovation Centre

    Three different femoral head roughening techniques were selected in order to investigate their effect on polyethylene wear. We found that tumbling the femoral heads provided a consistent roughened surface finish. It was also shown to produce the most consistent wear rates. Wear rates generally increased when the lubricant protein concentration was increased from 17 g/L to 30 g/L. Surface roughness measurements from retrieved femoral heads showed that artificial roughening beyond an average roughness of 0.30 μm may not be clinically relevant, and that certain methods of artificial femoral head roughening can produce excessive wear. It is recommended that ensuring a consistent and repeatable method for artificial roughening will maintain the integrity of the surface finish and the wear test.

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