1 00:00:00,000 --> 00:00:03,100 (English captions by Jade Cheng from the University of Michigan) 2 00:00:03,100 --> 00:00:07,230 Testing for osteoarthritis of the thumb at the trapezium metacarpal joint is done by 3 00:00:07,230 --> 00:00:09,320 using the axial grind test. 4 00:00:09,320 --> 00:00:14,049 The examiner grasps the thumb and places an axial force with grinding. 5 00:00:14,049 --> 00:00:16,270 Reproduction of pain is a positive test.