Bone is a living tissue. It comprises of cells that are in a constant state of a turnover. The various components that form bone are formed and the older components replaced. The components respond to the general health and the presence of a disease. It is also responsive to the general activities such as walking. The quality of bone density drops when a person is bed-bound. A similar trend is noted in the astronauts in a zero gravity environment.
Bone density can be assessed by specialized scans. One such scan is called the DEXA scan. It provides an objective assessment of bone density. Blood tests give additional information regarding bone quality.
Several factors affect bone health such as reduced level of activity, age, vitamin D deficiencies, systemic illness and smoking. Mitigating these factors can optimize bone health. Specific medications are sometimes required to improve the bone density.