Girl painlessly pops her kneecaps in and out of place like a a body horror movie scene (video)
For her entire life, a 19-year-old girl from Jiangsu, China has amused herself and others by popping her kneecaps in and out of place. Watch below! It looks like a scene from a David Cronenberg film. Finally, as a young adult, she visited a doctor at her friends' urging.
Turns out, she has congenital patella dislocation, a rare conditi…
