PTH and osteonecrosis: Additionally, long‐term BP treatment has been associated with increased bone micro‐damage, osteonecrosis, and atypical fracture.7, 8 Parathyroid hormone (PTH) therapy such as teriparatide (recombinant human parathyroid hormone, analog 1‐34) and abaloparatide (an analog of human parathyroid related peptide, PTHrp 1‐34) enhance bone formation.