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Osteomalacia: Causes, Symptoms and Treatment

Osteomalacia is a condition in which bones become soft and prone to fractures due to insufficient mineralization. It is most commonly caused by a deficiency of vitamin D, calcium, or phosphate.

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Things worth knowing about "Osteomalacia"

Osteomalacia is a condition in which bones become soft and prone to fractures due to insufficient mineralization. It is most commonly caused by a deficiency of vitamin D, calcium, or phosphate.

What is Osteomalacia?

Osteomalacia is a metabolic bone disease characterized by the softening of bones due to defective bone mineralization. Unlike osteoporosis, which involves a reduction in bone mass, osteomalacia involves an inability to properly harden the existing bone matrix with minerals such as calcium and phosphate. The term derives from the Greek words osteon (bone) and malakia (softness). In children, the equivalent condition is known as rickets.

Causes

The most common cause of osteomalacia is vitamin D deficiency, as vitamin D is essential for calcium and phosphate absorption in the intestine. Other causes include:

Inadequate dietary intake of calcium or phosphate, or malabsorption syndromes
Kidney disease, which impairs the activation of vitamin D or the reabsorption of phosphate
Liver disease, which disrupts vitamin D metabolism
Malabsorption conditions such as celiac disease or Crohn's disease
Certain medications, including anticonvulsants or long-term corticosteroids
Tumour-induced osteomalacia, caused by tumours that produce phosphate-regulating hormones
Rare genetic disorders affecting phosphate metabolism

Symptoms

Symptoms of osteomalacia often develop gradually and may be overlooked in the early stages. Common symptoms include:

Bone pain, particularly in the back, hips, pelvis, legs, and ribs
Muscle weakness, especially in the thighs and pelvic region
Increased bone fragility and risk of fractures with minimal trauma
Waddling or impaired gait
General fatigue and tiredness
Tingling or numbness in the limbs (in cases of calcium deficiency)

Diagnosis

Diagnosis of osteomalacia is based on a combination of clinical assessment, laboratory tests, and imaging:

Blood tests: Measurement of vitamin D (25-OH-vitamin D), calcium, phosphate, alkaline phosphatase (elevated in osteomalacia), and parathyroid hormone (PTH)
Urine tests: Assessment of calcium and phosphate excretion
X-rays: Characteristic findings include Looser zones (also called pseudofractures), which appear as radiolucent lines in the bone
Bone density scan (DXA): To differentiate from osteoporosis
Bone biopsy: In unclear cases, to directly assess bone mineralization

Treatment

Treatment is directed at the underlying cause of the condition:

Vitamin D Deficiency

In the most common form, supplementation with vitamin D (cholecalciferol, vitamin D3) at therapeutic doses is the primary treatment, often combined with calcium supplements. Dosages are tailored to the severity of the deficiency and monitored by a physician. In conditions that impair vitamin D activation (e.g., kidney or liver disease), active vitamin D metabolites such as calcitriol are used instead.

Phosphate Deficiency

When phosphate deficiency is present, supplementation with phosphate salts is indicated, often in combination with active vitamin D.

Treating the Underlying Condition

If osteomalacia is secondary to another medical condition, that condition must be addressed first – for example, a gluten-free diet for celiac disease, or adjusted renal replacement therapy for kidney failure.

General Measures

Regular sun exposure to promote the body's own vitamin D synthesis
A diet rich in vitamin D (oily fish, eggs, fortified foods)
Physiotherapy to strengthen muscles and reduce fall risk

Prognosis

When diagnosed and treated early, the prognosis for osteomalacia is generally very good. Bone mineralization typically recovers fully with appropriate therapy. If left untreated, the condition can lead to permanent bone deformities and an increased risk of fractures.

References

Holick MF – Vitamin D Deficiency. New England Journal of Medicine, 357(3):266–281, 2007
Compston J, Cooper A, Cooper C et al. – UK clinical guideline for the prevention and treatment of osteoporosis. Archives of Osteoporosis, 2017
Bhan A, Rao AD, Rao DS – Osteomalacia as a result of vitamin D deficiency. Endocrinology and Metabolism Clinics of North America, 39(2):321–331, 2010

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