What condition describes the weakening of bones due to decreased calcium storage?

The condition that describes the weakening of bones due to decreased calcium storage is osteoporosis. This disease is characterized by a reduction in bone density and mass, making bones more fragile and increasing the risk of fractures. Osteoporosis often develops silently over many years and is commonly associated with aging, hormonal changes, particularly a decrease in estrogen in postmenopausal women, and inadequate intake of calcium and vitamin D.

While osteoporosis primarily affects bone strength, the other conditions listed focus on different aspects: osteoarthritis involves the degeneration of joint cartilage and underlying bone, rheumatoid arthritis is an autoimmune condition that primarily affects joints, and muscular dystrophy relates to a group of genetic disorders that lead to muscle weakness and degeneration, rather than affecting bone density directly.