Rickets (Adult Osteomalacia): A Comprehensive Guide

Overview

Rickets is a condition that affects bone development in children, while osteomalacia is the adult equivalent. Both conditions involve the softening and weakening of bones due to a deficiency in vitamin D, calcium, or phosphate. In this guide, we'll focus primarily on osteomalacia, though many principles apply to rickets as well.

Who It Affects

Osteomalacia can affect adults of any age but is more common in:

• Older adults, due to reduced sun exposure and dietary intake
• People with darker skin, as melanin reduces vitamin D synthesis
• Individuals who cover their skin for cultural or religious reasons
• Those with certain medical conditions affecting nutrient absorption

Prevalence

Vitamin D deficiency is surprisingly common worldwide. According to the National Institutes of Health (NIH):

• Approximately 1 billion people worldwide have vitamin D deficiency
• In the U.S., about 42% of adults are vitamin D deficient
• Osteomalacia prevalence increases with age, affecting up to 25% of elderly patients in some studies

Symptoms

Osteomalacia often develops slowly and may be asymptomatic in early stages. When symptoms do appear, they may include:

Bone and Muscle Symptoms

• Bone pain: Typically dull, aching pain in the lower back, hips, pelvis, legs, and ribs
• Muscle weakness: Particularly in the arms and legs, making daily activities difficult
• Bone tenderness: Bones may feel sore when light pressure is applied
• Difficulty walking: May develop a waddling gait due to pelvic weakness
• Fractures: Bones may break more easily than normal

Other Possible Symptoms

• Fatigue and general weakness
• Difficulty climbing stairs or getting up from a seated position
• In severe cases, skeletal deformities may develop over time

Note that these symptoms can be subtle and may be mistaken for normal aging or other conditions like osteoporosis or arthritis.

Causes and Risk Factors

Primary Causes

The main cause of osteomalacia is vitamin D deficiency, which leads to impaired calcium absorption. Other causes include:

• Inadequate sunlight