Universal Joint Simulator:

Universal Joint Simulator - Overview

The Prosim Universal Joint Simulator originates from the programme of work done in the Life Long Joint FP7 Project, which sought to push the mechanical envelope of adverse wear testing of hip implants much further than it had gone before, drawing on the most up to date biomechanical data available. Using the outputs from that project we then set about developing a simulator that could perform across a much broader platform of usage, with the ability to:

  • Freely change the setup from joint to joint (running in-vivo demand profiles) without significant disruption and downtime
  • Operate in the range 0.01Hz to 0.5Hz for in-depth biomechanical studies
  • Also operate in the range 0.5Hz to 2.5Hz for in-depth bio-tribological studies
  • Run both force and displacement control across all six axes of motion
  • Accurately replicate the demands of extreme adverse scenarios such as stumbling or running
  • Mount a complete femoral stem in the simulator
  • Change the acetabular cup angulation in situ
  • Change the retroversion-anteversion angle in situ
  • Change the declination angle of the tibial tray in-situ
  • Run both force and displacement controlled microseparation
  • Instrument for tribo-corrosion studies

The end result is a simulator that is equally at home being used for the biomechanical study of cruciate ligaments in a cadaveric knee sample as it is for running a ‘quick and dirty’ 1 million cycle adverse wear test on a new coating for an implant. The headline performance specification is as follows:

  • Can be used for the for the study of both cadaveric and non-cadaveric samples
  • Six independent axes of articulation
  • Equipped with a novel six axis loadcell rated to 12kN that allows the mounting of a complete femoral stem
  • Simple user programmability of any articulation/load cycle
  • Operating frequency of motions programmable up to 0.01 Hz to 2.5 Hz
  • Capable of running programmed sequences of walking, jogging, running and periods of rest
  • Peak axial loading of up to 11kN
  • Up to +40°/-120° of programmable motion on the flexion extension axis
  • Up to +/-25mm of programmable medial lateral translation applying up to 1.5kN force
  • Up to +/-25mm of programmable anterior-posterior translation applying up to 1.5kN force
  • Up to +/- 40° of programmable motion on the axial rotation axis
  • Up to +/-40° of programmable motion on the adduction/abduction axis
  • Able to adjust acetabular cup angulation from +30° to +65° in situ
  • Able to adjust retroversion-anteversion angulation from +/- 35° in situ
  • Able to adjust tibial tray declination from 0° to -15° in situ
  • Able to run both force and displacement control of all axes
  • Test fluid temperature is maintained at 37°C ±2°C
  • Clinically and physiologically representative testing
Universal Joint Simulator PDF
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