I think it's fine provided you take all the meat/fat off. It's raw, and unless you have her on a raw diet, I probably wouldn't let her eat too much of it since kibble and raw digest differently.
[MENTION=3354]RiiSi[/MENTION]. I'm not sure but maybe the weight bearing bones of large animals are too hard to feed. That's a femur head, the largest of all long bones.
That head of the bone is actually the softest part, the bone between the joints is hard. It's mainly cartilage and if he can get anything of it it's only good for his joints. I also wouldn't worry about giving it with kibble, he can knaw so little out of it that it will do no harm. Of course everthing new and out of the ordinary can upset his stomach. Only downside is that cause there is so much soft tissue in it it will start to smell after a few days...