Which technetium is most commonly used in bone pathology?

Technetium (99mTc) medronic acid is a pharmaceutical product used in nuclear medicine to localize hone metastases as well as other diseases that can alter the normal osteogenesis in bone. 99mTc-medronate Aka 99mTc-methylene diphosphonate, or 99mTc-MDP FDA approved imaging agent to investigate extra-skeletal osteogenesis (Metastasis)