From total knee prostheses to individual components, we offer a full suite of total knee replacement (TKR) testing services. Our experts have experience testing femurs, patellas, tibial trays and tibial bearings, and can assist with custom setups and challenging projects.

Сòòò½APP’s medical device testing labs perform a variety of mechanical testing services for total knee replacements (TKRs), including fatigue testing, wear testing and metallurgical evaluation for both bicondylar and unicondylar knees. We can assist in protocol development and design, feasibility studies and regulatory submissions for knee implants, and provide testing to many of the industry’s most used standards.

Our Knee Implant Testing Services

Сòòò½APP’s team of experts are uniquely situated to provide every stage of knee implant testing in-house, giving us greater oversight over the testing process and the ability to manage your project from start to finish. Our testing labs feature dedicated frames for knee implant testing, giving us greater capacity and competitive turnaround times. 

Some of the services that we offer include:

  • Fatigue Testing
  • Wear Testing
  • Range of Motion Testing
  • Contact Pressure using TEKscan capabilities
  • Bearing Interlocking Strength
  • Constraint
  • Particle Evaluation

For more information about our knee implant testing services, or to speak with an expert, contact us today.

American Society for Testing and Materials

ASTM F1223, ASTM F1672,  ASTM F1800, ASTM F1814, ASTM F1800, ASTM F2083, ASTM F2723, ASTM F2777

International Standards Organization

ISO 14879, ISO 14242, ISO 14243

Knee Implant Fatigue Testing 640 x 480 May 2018
knee implant testing

Knee Implant Fatigue Testing

Whether for feasibility or submission purposes, Сòòò½APP's fatigue testing services provide the critical data you need to validate your device design.

Tibial Tray (ASTM F1800 & ISO 14879)

Tibial tray fatigue testing (link to fatigue) is performed by fixating one half of the tibial baseplate and applying a constant amplitude load to the unsupported half of the baseplate. Per ASTM F1800 & ISO 14879, testing is performed to a run-out of 10 million cycles. For submission testing, five samples must survive 10 million cycles under at least 900 N of load.

Tibial Bearing Components

For implants that are posterior-stabilized, shear fatigue testing of the UHMWPE tibial post is recommended. Six samples are cycled at varying loads to develop an S/N curve. At least one sample should complete full run-out to 10 million cycles.

Femoral implants

Femurs are evaluated for fatigue properties in a variety of conditions. Various flexion angles and cementing configurations can be tested to evaluate fatigue performance. Both S/N curves and minimum run-outs can be tested.

Tibial Insert Endurance under High Flexion

For knee systems designed to allow high flexion, this test method evaluates the ability of UHMWPE inserts to resist deformation and fracture due to repeated deep knee bend activities. Tests are performed in-vitro to 220,000 cycles at a 2,275 N load. Results are benchmarked by performing pre- and post-test scans, along with constraint tests.

Contact Pressure and Constraint Testing 640 x 480 May 2018
knee implant testing

Contact Pressure & Constraint Testing

Contact pressure and distribution can have significant effects on knee implant wear properties, while constraint testing is critical in determining the dislocation and motion resistance of the implant system.

Contact Pressure

Utilizing a variety of pressure sensitive films, Сòòò½APP provides contact stress analysis of tibiofemoral and femoral-patellar knee implant contact mechanics. Testing is performed at multiple flexion angles with varying normal loads.

Constraint Testing (ASTM F1223)

Сòòò½APP provides both translational and rotational knee constraint testing services per ASTM F1223. Anterior, posterior, medial, lateral and rotational tibiofemoral shear forces are applied to induce either subluxation or a specified angle of rotation. This test can be crucial when comparing standard inserts, congruent inserts, or posterior stabilized inserts.

Knee Implant Wear Testing 640 x 480 May 2018
knee implant testing

Knee Implant Wear Testing

Knee wear testing allows for the measurement of wear rates between the femoral component and the tibial insert. Сòòò½APP can perform wear testing in either force or displacement control.

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ISO 14243-1 or ISO 14243-3

Axial force (Fz), anterior/posterior force (Fx), flexion/extension (My), and tibial rotation (Mz) are coupled to accurately simulate the complex, simultaneous motions of the human knee. Test programs run at a frequency of 1 Hz to 5,000,000 cycles. At various intervals, the samples are removed and precisely measured for mass loss. After testing, a particle analysis is performed on the test solution using SEM/EDS equipment to create a comprehensive morphology report.

Сòòò½APP’s knee wear test frames contain:

  • 6 test stations and 2 load/soak controls
  • Ability to perform force or displacement-controlled testing (ISO 14243-1 or ISO 14243-2)
  • Environmental chambers for bovine solution
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Other Product Qualification Testing Services

Accelerated Aging Accelerated Weathering Testing Acceleration Testing Advisory Services Aircraft Ditching Testing Altitude Testing and Simulation Bespoke Fire Testing Bird Strike Testing Breath Alcohol Ignition Interlock Device Component High Cycle Fatigue Testing Cone Calorimetry Doors and Windows Testing Dynamics Testing Electromagnetic Compatibility (EMC) Testing Electronics Test Methods Environmental Stress Screening (ESS) Test Environmental Testing Explosive Atmosphere Testing and Certification External Cladding Fire Resistance Flame Fire and Flammability Testing Fluid Susceptibility Testing
Fuel System Testing Hail Impact Testing HALT Testing and HASS Testing Hardware Testing High Cycle Fatigue Testing High Level Acoustic Noise Testing Highly Accelerated Stress Testing Hose Testing Humidity Testing Hybrid and Electric Vehicle Battery Testing Ingress Protection Testing International Certifications and Approvals Liquids and Fuels Testing Low Lubricity Aircraft Fuel Testing Marine Fire Testing MIL-STD-810 Testing Plastic Pipes Testing Pneumatics Testing Pressure Testing Product Assessment Reports Product Certification Services Product Compliance Services
Product Safety Testing Radiant Panel Testing Rail Fire Testing Reaction to Fire RTCA DO-160 Testing Salt Fog and Salt Spray Testing Sand and Dust Testing Seismic Testing Shock Testing Space Simulation Spin Testing Steiner Tunnel Testing Structures Testing Temperature and Thermal Testing Thermal Vacuum Testing Towing Trailer and Hitch Product Testing Vibration Testing VOC and SVOC Testing Water Mist Systems Wireless Radio Testing Zigbee Certification Services
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