Meniscal tears often lead to degenerative arthritis, attributed primarily to the changes in the magnitude and pattern of stress distribution in the knee. While meniscal replacement traditionally involves implantation of allografts, problems related to availability, size matching, and cost limit their use. In this regard, there are significant potential advantages to a bio-stable synthetic meniscus implant that combines long-term durability with a dependable biomechanical performance resembling that of the natural meniscus. The Nusurface ® medial Meniscus Implant is a poly-(carbonate-urethane) implant that recreates the functionality of the meniscus, as evidenced by compression tests to determine its pressure distribution capability [1] and finite element analyses [2] in its virgin state. However, the overall success of such an implant is dependent on its long-term functional properties, and biomechanical testing of the NUsurface ® device has not yet examined the effect of varying and dynamic testing conditions. In particular, the pre-test soaking in physiologic solution and the loading rate can have non-trivial influences on the properties of the device. Therefore the aims of this study were to characterize the strain-rate response, as well as the viscoelastic properties of the implant as measured by creep, stress relaxation, and hysteresis after simulated use.

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