Abstract
Nine electrical resistance strain gauges were bonded with cyanoacrylate monomer to the radius in 5 goats and 1 sheep. Recordings were taken of strain on the bone surface during locomotion. The animals were sacrificed at periods up to 3 weeks after the gauges had been implanted. The reliability of the bone-gauge bond was then tested independently by means of a mirror extensometer. With the extensometer spanning the same section of bone as the gauge, the simultaneous strain measurements from the two systems were compared as the bone was loaded in a test machine. A similar comparison was made between the mirror extensometer and gauges which had been attached with epoxy resin to a brass test specimen. The average percentage difference in strain between the extensometer and gauge values was +0.8 (±S.E. 0.7) on the bones, and −1.3 (±S.E. 2.4) on the test specimen (extensometer value = 0%). There was no correlation between the difference in strain values from the two methods and the length of time the strain gauges had been implanted in vivo.
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