Bone mineral density: testing for osteoporosis.

Area of Science:

• Orthopedics
• Endocrinology
• Radiology

Background:

• Primary osteoporosis stems from aging-related bone loss.
• Secondary osteoporosis arises from specific, potentially reversible conditions.
• Vertebral fractures can be identified via thoracolumbar X-rays.

Purpose of the Study:

• To outline diagnostic methods for osteoporosis.
• To define criteria for osteoporosis diagnosis.
• To establish fracture risk assessment guidelines.

Main Methods:

• Dual-energy X-ray absorptiometry (DXA) is the gold standard for bone mineral density (BMD) measurement.
• Total hip BMD predicts hip fracture risk; lumbar spine BMD monitors treatment efficacy.
• T-scores compare patient BMD to young, healthy individuals; Z-scores compare to age-matched peers.

Main Results:

• Osteoporosis is defined by a femoral neck T-score of -2.5 or less.
• A Z-score of -2.5 or less suggests secondary osteoporosis.
• Clinical risk calculators predict 10-year fracture probability.

Conclusions:

• Abnormal fracture probability (hip >5%, any >20%) warrants treatment.
• DXA scans and risk calculators are crucial for managing osteoporosis.
• Differentiating primary and secondary osteoporosis is key for effective intervention.