Human tissue is the best way to help a human.
When a blood transfusion or organ transplant is needed, we do not even consider using material from another species. Although tissue transplants between different species are possible in certain situations, the ideal solution is tissue donation from the same species. A steak is a delicious meal, but most people would not want one inserted into their body.
The human graft and the receiver’s bone tissue have the same trabecular structure. Our bones are made up of compact outer bone (cortex) and spongy inner bone, similar to the supporting structure of modern stadiums that resemble the shape of a bird’s nest, which ensures sufficient stability with reduced static weight. If our bones consisted of compact
cortex only they would be so heavy that they would constantly fracture. These smart, weight-bearing “bird’s nest” little columns are called trabeculae. In the case of human bones, their cross-sections are circular, but cow bone trabeculae, for example, are flatter.
This difference may also contribute to the fact that the body recognizes human bone replacement as more compatible, and accepts it more easily than variations from other species.