EndoLab - Implant Testing Services Implant Testing

Hip simulator test ISO 14242-1

Normative References  



ISO 14242-1: Implants for surgery - wear of total hip prostheses - Part 1: Loading and displacement parameters for wear-testing machines and corresponding environmental conditions for tests

ISO 14242-2: Implants for surgery - wear of total hip prostheses Part 2: Methods of measurement
 


The EndoLab® hip joint simulator performs 2x3 simultaneous tests (plus 2 soak controls). The specimens are oriented in an anatomically correct position, the resulting hip joint force is applied via the cup. Consequently, the direction of the force vector is constant relative to the cup and moves relative to the head. All three in-vivo angular displacements are simulated: Flexion/extension, abduction/adduction and internal/external rotation. Please download our video to see the simulator moving. The specimens are assembled under laminar flow conditions and sealed by capsulated single test chambers to exclude contamination. The temperature of the test fluid as well as the fluid level are controlled throughout testing. The wear of the components is determined gravimetrically. Following customer requests an analysis of the wear debris according to ISO 17853 can be conducted.  


Parameter



Parameter ISO14242
force curve double-peak according to PAUL
force is fixed relatively to cup
force maximum 3.0 kN
frequency 1.0 Hz
cup inclination „L“ according to ISO 14242 -1 30° (corresponds to an in vivo inclination of 45°)
inclination cup-ball
flexion-extension +25/-18°
abduktion-adduktion +7/-4°
rotation +2/-11°
test fluid newborn calf serum
temperature 37°C
cycles 5 Mio.
inspection cycles 0.5 million, 1 million 2 million etc.