Understanding Calcium and Bone Diseases: Rickets and Osteomalacia

The question asks about diseases where calcium is given in excess quantities. This relates to conditions affecting bone health and mineralization, particularly those involving deficiencies that impair calcium absorption or utilization.

The Role of Calcium in Bone Health

Calcium is a vital mineral for building and maintaining strong bones and teeth. Bones act as a reservoir for calcium, and when the body doesn't get enough, it can draw calcium from the bones, weakening them over time. Proper absorption and utilization of calcium often require sufficient levels of Vitamin D.

Rickets and Osteomalacia: Diseases of Weak Bones

Rickets is a childhood condition characterized by soft and weak bones, often leading to bowed legs or other skeletal deformities. It is primarily caused by a deficiency in Vitamin D, which impairs the body's ability to absorb calcium and phosphorus properly. Without enough absorbed calcium, bones cannot mineralize and harden correctly.

Osteomalacia is the adult form of rickets. Like rickets, it involves the softening and weakening of bones due to impaired mineralization. This is frequently caused by a severe Vitamin D deficiency or problems with phosphorus metabolism, leading to insufficient calcium deposition in the bone matrix. Both rickets and osteomalacia are considered metabolic bone diseases.

Why Calcium Supplementation is Crucial

Because rickets and osteomalacia result from the body's inability to effectively use calcium and phosphorus for bone mineralization, treatment often involves providing these minerals, along with Vitamin D to enhance absorption. Therefore, calcium is typically given in excess quantities (relative to normal dietary intake for healthy individuals) to help rebuild bone density and strength in patients suffering from these conditions. This supplementation helps overcome the absorption issues and provides the building blocks needed for healthier bones, addressing the underlying calcium deficiency symptoms.

Analyzing the Options

• Scurvy: This disease is caused by Vitamin C deficiency and affects connective tissue and wound healing. It is not primarily treated with excess calcium.
• Fever: This is a symptom of illness, not a specific deficiency disease treated with calcium.
• Beri-Beri: This disease is caused by Vitamin B1 (thiamine) deficiency and affects the nervous system and heart. It is not treated with excess calcium.
• Osteomalacia: As explained, this is an adult bone disease caused by insufficient calcium and phosphorus mineralization, often due to Vitamin D deficiency. Providing excess calcium and Vitamin D is a standard treatment to help restore bone health and combat the effects of calcium deficiency.

Considering the nature of rickets and osteomalacia as bone diseases related to impaired calcium metabolism and mineralization, providing supplemental calcium is a key part of their treatment. This highlights why calcium is given in excess in these conditions.