Decades of success in using orthopaedic implants for the restoration of normal function to arthritic joints and for post-trauma stabilization and repair has led to a proliferation of new materials, designs, and applications. Dozens of joint replacement products, most commonly for the hip, spine and knee joints, are available on the market. As they represent the most complex mechanical systems in the body, articulating joints provide implant designers with many challenges to overcome. Most notably, designers must apply their knowledge of joint kinematics and loads to their designs to ensure life-long performance.
Physiological forces dependent on the patient’s body weight and physical activities, motions in up to six degrees-of-freedom, and the need for a near frictionless bearing surface, are all taken into consideration in attempts to replicate the joint. In addition, the effects of stress shielding and wear must be studied and the service life of the implant in vivo must be verified. All this fuels a fast-growing need for more complex and anatomically correct testing protocols.
Instron® has considerable experience of mechanical testing in orthopaedics, spinal devices, and devices for osteosynthesis: from basic static testing of raw materials, to impact loading of joint components, through to complete simulation for evaluating the fatigue and wear properties in vivo. Through every phase of implant development, our innovative solutions meet a vast array of demands found within the orthopaedics field. The following highlights the range of orthopaedic applications we are actively involved in with our customers.
Hip and Knee Implants
- Endurance and Fatigue Testing of Artificial Hip Implant Prostheses (ISO 7206-4, 7206-6 and 7206-8)
- Knee Testing: Fatigue of Tibial Trays (ISO 14879-1)
- Knee Laxity Studies
Osteosynthesis and Trauma Devices
- Flexural Fatigue Testing Metallic Bone Plates and Fixation Devices (ASTM F382)
- Metallic Angled Orthopaedic Fracture Fixation Devices (ASTM F384)
- Low Force Dynamic and Fatigue Testing of Orthopaedic Micro-Implants for Fracture Fixation
- Torsion Testing Metallic Bone Screws (ASTM F543, ISO 6475)
- Axial and Torsion Testing of Bone Screws (ASTM F543)
- Dynamic Fatigue Testing of Femoral Nails