Related to both skeletons/bones and immunology is the inflammation of joints or arthritis. There are many kinds and causes of arthritis and its symptoms can range from irritating to debilitating. The most common form is osteoarthritis, which mainly affects the elder population, but a significant portion: about 30% of women at age 65 have osteoarthritis. Apparently we humans have suffered from arthritis throughout our history, having been found even in Egyptian and Peruvian mummies!
Ok, now to the title story.... several studies, including one recent, indicate that dinosaurs, too, had arthritis. They just didn't get any breaks, huh?
Full citation of the original article:
SASSOON, J., NOÈ, L. F. and BENTON, M. J. (2012), Cranial anatomy,
taxonomic implications and palaeopathology of an Upper Jurassic pliosaur
(Reptilia: Sauropterygia) from Westbury, Wiltshire, UK. Palaeontology.