ASTM F2068 covers metallic stemmed femoral prostheses used to replace the natural hip joints. ASTM F2068 prostheses are intended to articulate with the natural acetabulum of the patient. Prostheses for total hip replacement are intended to articulate with prosthetic acetabular cups. Prostheses may have integral femoral heads or cones designed to accept modular heads.
Femoral prostheses conforming to ASTM F2068 should be capable of withstanding normal static and dynamic loading in the physiological range without overload fracture, plastic deformation, or fatigue fracture. Representative samples shall be able to withstand cyclic loading with a minimum load of 300 N and a maximum load of 2300 N, or cyclic loading with a minimum load of 300 N and a maximum load of 3300 N. For ASTM test methods, use an unsupported implant length of 50 mm in accordance with the ASTM definition.
The representative test samples should be selected from the standard (average patient) size range and which presents the worse case stress conditions for the design series. To meet the worse case stress recommendation, implants should be tested with the worst-case offset head. Alternatively, the demonstrated fatigue strength of the implant size with the highest stresses, when tested with the worst-case offset head, shall be equivalent to or exceed the demonstrated fatigue strength of a comparable, clinically successful femoral implant design.
By means of our prostheses testing expertise and modular product design, we will help find the solution that is right for you. Give our test engineers a call today for help configuring the best test machine and accessories according to ASTM F2068.
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