What a question for a Sunday morning-;)
//////i do have -
diagnosed hypermobility, with pretty bad cracking & grinding & scraping in pretty much every joint
diagnosed wear & tear,
undiagnosed EDS (but 100% certain)
hyperostosis frontalis interna - thickening of the skull/////
That is the answer in your particular case, but now to generalise.
Long bones should be smooth except where tendons, muscles and ligaments are attached which become boney with age.
So far so good.
If you had asked this question 100 years ago, we would have been talking about Rickets and perhaps John Merrick the Elephant man.
Today, knobbly long bones are the result of past trauma, both major types of Arthritis and perhaps Osteomalacia.
There are other conditions which may cause knowledge long bones, but they are uncommon and need not be considered on AB.
Remember that long bones have to be smooth to allow the effortless movement of tendons and muscles of movement.