WEBVTT 00:00:00.000 --> 00:00:03.179 English captions by Jade Cheng from the University of Michigan 00:00:03.179 --> 00:00:08.001 In a prone position, Achilles tendon stability can be assessed using Thompson's test. 00:00:08.001 --> 00:00:12.009 Flex the knee to ninety degrees, squeeze the calf, and observe for plantarflexion of the 00:00:12.009 --> 00:00:13.309 foot. 00:00:13.309 --> 99:59:59.999 Absence of plantarflexion indicates Achilles tendon rupture.