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Title Study of the Functional and Mechanical Properties of the Meniscus
Author Petersen, Helene Randal (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Andersen, Lonnie Ulrich (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2009
Abstract Meniscal injuries are among the most frequent injuries in orthopaedics and will inevitably lead to degeneration of the knee articular cartilage. Therefore it is important to develop appropriate replacement materials that show long term resistance to high and cyclic loading. Furthermore the mechanical properties of reliable replacement materials must resemble the native meniscus to a high degree. In this study the bovine menisci were therefore tested at two dierent ramp speeds to obtain the normal tensile properties and the viscoelastic properties. The high ramp speed was chosen as close to the ramp speed experienced by the native meniscus during walking as was possible. It was found that the strain rate had no signicant inuence on the tensile material properties such as the elastic modulus and the maximum stress, but that the viscoelastic properties were greatly aected by the strain rate. A considerable permanent strain was seen at the cyclic load unload testing at the low ramp speed. At the high ramp speed the eect was much less pronounced, which corresponds well with the fact that no permanent strain should occur in the native meniscus during cyclic loading. This study therefore concludes that the strain rate should be taken into account, when testing the material properties of the menisci.
Pages 199
Keywords Materialeforskning; Materials research; Materialekarakterisering og materialemodellering; Materials characterization and modelling
Fulltext
Original PDF Master_thesis_Petersen_Andersen.pdf (4.78 MB)
Admin Creation date: 2009-06-18    Update date: 2009-10-09    Source: dtu    ID: 244975    Original MXD