National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.00 seconds. 
UHMWPE failure in knee joint component
Franta, L. ; Jeníková, Z. ; Pražák, Josef ; Suchánek, J.
A simulation of realistic tribologic conditions in tests “in vitro”contributes significantly to the research in the field of joint replacements. Motion under low relative velocities of friction surfaces of knee joint replacements is studied. The simulator enabled combination of rolling and sliding motion of replacement components. During the experiment, numerous debris of UHMWPE component ares produced and the friction surface is irreversibly changed. Initially, the irregularities of tibial component are smoothed. Consequently, large amount of UHMWPE debris is released. Specimens were loaded for 15.105 cycles with dry or distilled water lubrication. The surface changes of specimens were evaluated.
Vliv .gamma.-záření na reologické vlastnosti tavenin ultravysokomolekulárního polyethylenu
Mikešová, Jana ; Nevoralová, Martina
Ultra-high molecular weight polyethylene is widely used as material in orthopaedic implants. Melt rheology was used to evaluate the result of simultaneous crosslinking and chain scission process in the polymer, .gamma.-irradiated in the solid state. The predominant mechanism in the process was strongly influenced by irradiation dose and dose-rate. An important result was obtained for the polymer irradiated with the sterilization dose 25 kGy and stored in nitrogen when no significant degradation of the polymer was observed.

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