Looser zones, or pseudofractures, are characteristic radiographic findings in which condition?

• A. Osteoarthritis features.
• B. Looser zones are pseudofractures seen in osteomalacia.
• C. Osteoporosis features.
• D. Rheumatoid changes.

Answer: (B)

Looser zones are bands of defective mineralization that appear as pseudofractures on radiographs, a hallmark of osteomalacia. In osteomalacia, osteoid is laid down but fails to mineralize properly due to low vitamin D (or related phosphate/calcium disturbances). This creates radiolucent lines across the cortex, often with surrounding sclerosis, particularly in weight-bearing bones like the pelvis, ribs, and femoral neck. Clinically, osteomalacia presents with bone pain and muscle weakness, and these pseudofractures reflect the failure to mineralize rather than true complete fractures.

They aren’t typical for osteoarthritis (joint space changes and osteophytes), osteoporosis (generalized bone mass loss with fragility fractures but not pseudofractures), or rheumatoid changes (synovitis with erosions and periarticular osteopenia).