Can acupunture help blood flow in bones?

Unknown. There are no studies in the published english-language scientific literature that have demonstrated a causal link between acupuncture or acupressure with skeletal blood flow.
No data. But it can speed up bone healing after fracture.
TCM Kidney. Dr kimm made good points. Traditional chinese medicine (tcm) differs in many ways from western medicine. In tcm the kidney is the central focus, but in western medicine it is the heart. The concepts are quite different . Bone marrow falls under the sphere of tcm kidney influence. Major energy /chi movement acupuncture using meridians can strengthen tcm kidney & thus facilitate bone function.