LONDON – Orthox Ltd. is primed for an assault on the mountain that is knee cartilage repair after raising $12.5 million in a series A funding round. After more than a decade of translational and preclinical research, these funds will allow the company to start a trial of Fibrofix, a tissue regeneration product derived from silk, in the middle of this year. An initial cohort of six patients in the U.K. will be treated for sports injury-related cartilage damage, with six months follow up to demonstrate safety. Assuming positive results, that will be followed by treating a further 75 patients in the U.K., Hungary and elsewhere in mainland Europe.