Knee Implant Testing

STEMart performs a variety of testing for knee prostheses and individual knee replacement components such as femurs, patellas, tibial trays and tibial inserts to characterize their use life and durability.

Applicable Standards

• ASTM
• ISO

Test Capabilities

• Fatigue Testing
• Tibial tray fatigue testing
• Unicondylar tibial tray fatigue testing
• Tibial post fatigue testing
• Tibial insert fatigue testing
• Mobile bearing knee tibial baseplate/bearing fatigue testing
• Knee condyle fatigue testing
• Contact Pressure Testing: Evaluate the pressure distribution and total contact area between the femoral component and tibial insert, and between the femoral component and the patella insert of a total knee replacement system under different flexion angles and loads.
• Range of Motion Assessment
• Wear Testing: Wear of total knee endoprostheses and patellofemoral joint is determined by weight loss and/or geometric measurements. Particle analysis of wear debris is available.
• Interlocking Strength Testing
• Investigate the strength of the interlocking mechanism of modular tibial PS and CR inserts.
• Investigate the strength of the interlocking mechanism between the tibial baseplate and the tibial insert of PS knees towards static loads in anterior-posterior, posterior-anterior, medio-lateral and tensile loading direction.
• Mechanical Tests of Patella Implants
• Dislocation or lateral subluxation tests
• Component disassociation tests
• Fixation failure tests
• Device fracture tests
• Contact area and contact pressure tests
• Articular surface wear tests
• Porous metal coating tests
• Dimensional and Endurance Properties of Knee Joint Replacement Implants
• UHMWPE insert thickness
• Articular surface roughness
• Non-articular surface roughness
• Geometrical testing
• Fatigue testing
• Wear testing

STEMart performs a variety of mechanical testing services for partial and total knee replacements, including fatigue testing, wear testing and contact pressure testing for both bicondylar and unicondylar knees. If you want to learn more detail about our service, or would like to consult with the experts at STEMart, please feel free to contact us.