A worker tries on a prosthetic leg for Jimena Ruiz, 6, at the Center of Advanced Prosthetics in San Jose February 11. Dino Cozzarelli, an Ecuadorian orthotist and prosthetist living in Costa Rica, is attempting to introduce affordable prosthetic limbs for patients by purchasing prosthesis used previously in the US and Europe and modifying them to fit their new wearers. For instance, a new bionic knee costs an average of $20,000 while a used one purchased and fitted with new sockets would cost patients only a quarter of its price. According to Cozzarelli, modifying plastic prosthesis is a better option for patients using free wooden prosthesis funded by the state's social security system, which are heavier and of lower quality than plastic ones. Reuters/Juan Carlos Ulate