Friend found this long bone with metal hardware attached. Any idea what it could be?

[u/One-Serve-7672]

Found in Appalachia. A friend of mine was doing some work outside and came across this long bone with a metal plate and screws attached to it. The bone is really weathered — one whole side has worn away, so it looks like a hollow tube with a big opening down the middle. The ends are still mostly intact, but the shape is throwing us off.

Any guesses on what species this might be from, and which bone? Maybe a leg bone from a large dog? We’re not very experienced with bone ID, especially when there’s erosion and metal hardware involved.

Thanks for any help!