The effects of demineralized bone matrix proteins, estrogen, and an antagonist to neuropeptide y on osteoblast and osteoclast viability and function related to osteoporosis.

Currently, osteoporosis affects over half of our population beyond the age of 50, and hip fractures related to osteoporosis accounted for direct costs of $18 billion in 2002 ("About Osteoporosis: Fast Facts", 2006). The average length of a hospital stay for a primary fracture diagnosis is nearly one week, and approximately 25% of previously independent older patients who sustain hip fractures remain in long-term care for over a year. In response to the necessity for improved fracture care and shortened healing time, the field of orthopaedic surgery has begun to turn toward cellular and molecular biology research for the next answer.