What condition is characterized by bones becoming softened due to excessive calcium removal for body functions?

The condition characterized by bones becoming softened due to excessive calcium removal for body functions is rickets. This disease is often associated with a deficiency of vitamin D, which is essential for calcium absorption in the bones. When calcium levels are low because of inadequate dietary intake or lack of sunlight exposure, the body compensates by pulling calcium from the bones, leading to their softening and weakened structure.

Rickets typically occurs in children and can result in skeletal deformities such as bowed legs, thickened wrists and ankles, and in severe cases, it can affect the shape of the skull and pelvis. The weakening of bones makes them more susceptible to fractures and other abnormalities.

In contrast, osteoporosis refers to a condition where bone density decreases, leading to an increased risk of fractures, but it is distinct from rickets. Spondylarthritis involves inflammation in the spine and surrounding joints, and strain pertains to an injury to muscles or tendons, neither of which are related to the softening of bones due to calcium deficiency.