Fig. 4From: Fatigue strength of bovine articular cartilage-on-bone under three-point bending: the effect of loading frequencyCartilage surface crack observed on specimens that reached run-out at loading frequencies of 1 Hz and 10 Hz (a) Top view of the selected specimens after run-out was reached at a loading frequency of 1 Hz and (b) 10 Hz. Both specimens in these images were loaded in the 6–60 NBack to article page