Young amputees in some of the poorest parts of the world will be able to navigate rough terrain to access jobs and opportunities with the help of new, specially developed prosthetic knees, after a non-profit company received a grant from the UK government to develop its design. [...] D-Rev, a development company based in San Francisco, California, has been awarded around $100,000 (£76,280) in UK aid money to develop a polycentric, four-bar knee, which wearers will be able to use over uneven ground.