Knee Wear Testing - Test Methods

Overview

Currently all our Knee Wear testing is being performed using two Six-station servo-hydraulic Knee simulators designed and manufactured by AMTI. These Knee Simulators currently provide the most advanced, reliable and accurate methods in evaluating the wear between the femoral component and the tibial insert associated with Knee implants. Our AMTI knee simulators are designed to replicate daily activities such as walking, climbing stairs, running etc allowing us to carry out accurate in-vitro wear testing for clients.

Equipment

The Six Station AMTI Knee Wear Simulator allows us to test up to six implants simultaneously with an additional 4 Load soaked control stations. Our equipment allows us to carry out testing with force or displacement controlled kinematics as per ISO 14243-1 (load control) or ISO 14243-3 (displacement control).

  • AMTI simulators can be operated under both force and displacement control
  • Each Station has a Six multi-axis load cells
  • The six-component force sensors allow for the continuous or periodic measurement of the forces and moments of the x, y, and z axes.

Testing

Our highly advanced testing equipment and laboratory allows us to perform ISO and ASTM Standardized testing. Not only can we carry out standardized wear testing but with the aid of our house machine shop we can design and manufacture specialized fixtures to modify set up conditions depending on the client’s needs giving us the ability to provide high quality testing with a prompt and efficient service.

ISO and ASTM Standards

ISO 14243 - Implants for surgery - Wear of total knee joint prostheses.

ASTM F2025- Practice for Gravimetric Measurement of Polymeric Components for Wear Assessment.

Related Tests

ISO 17853:2011 – Wear of Implant Materials – Polymer and Metal wear Particles – Isolation and Characterization.

ASTM F1877 – Standard Practice for Characterization of Particles.

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    Orthopedic Implant Wear and Fatigue Testing