Update See comment for the distinction between scoliosis and kyphosis. Maybe the written record had it right in the first place.
So the body of Richard III has been found, buried under a parking lot. (Jimmy Hoffa is still missing.) There’s no evidence of the withered arm portrayed by Shakespeare.
Oddly, though, there is evidence of severe scoliosis. Tudor literature portrayed him as hunchbacked, but contemporary documents make no mention of it, and the portraits show him as entirely upright. Score one for oral tradition over the written record.
Footnote Josephine Tey wrote wonderful mystery novels, and The Daughter of Time is a marvelously convincing presentation of the case for Richard’s innocence, but his nephews disappeared from public sight under his control and never reappeared. Guilty, on mine honor.