SummaryThe fatigue-crack propagation behavior of Type 316 stainless steel wm studied under simulated body conditions. The .fatigue specimens were immersed in circulating Ringers Solution at a temperature of 98°F. Cyclic loading was accomplished a t a frequency and load waveform that corresponded to normal level walking. The concepts of linear elastic fracture mechanics were used t o evaluate the fatigue behavior, and it waa found that the crack-growth rate was higher under simulated body conditions than for a corresponding test conducted under ambient air conditions.

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Tests were conducted on uranium under constant load and cyclic temperature. The work reported was different from earlier tests in that longer periods were used for the temperature cycle.

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SummaryA porous titanium alloy called void metal composite (VMC) was investigated for use in knee prosthesis fixation. The interfacial ingrowth fixation of VMC intrarneduallary, subchondral, and variable density implants in goat femora was evaluated biornechanically and histologically at six weeks and five months. Biomechanical tests were done under static shear and dynamic, cyclic (fatigue) loading conditions. Readily identifiable bone, strong fixation, and excellent biocompatibility were typical. Some subarticular implants appeared to induce normal hyaline cartilage overgrowth.