But sometimes, there are 208. The fabella, a small bone in a tendon behind the knee, was lost over the course of early human evolution, but these days it’s becoming more common, according to a study ...

Almost 800,000 total knee replacements (TKRs) are done in the U.S. every year, offering many folks a chance to reclaim total mobility. But the surgery is complex, recovery demanding, and it can pose ...