Looser zones are pseudofractures classically seen in which bone disorder?

Looser zones are pseudofractures classically seen in which bone disorder?

• A. Osteoporosis
• B. Hyperparathyroidism without bone disease
• C. Scurvy
• D. Osteomalacia

Answer: (D)

Looser zones are pseudofractures due to defective mineralization of osteoid in adults, most characteristic of osteomalacia. In osteomalacia the bone matrix is laid down but fails to mineralize properly, often from vitamin D deficiency or phosphate abnormalities. This creates transverse, lucent bands at the cortex with sclerotic margins—microfractures that occur at sites of recurrent stress and heal poorly because mineralization is impaired. These lines commonly appear in weight-bearing bones and near joints. Osteoporosis primarily shows reduced bone density without these lucent cortical bands. Hyperparathyroidism without bone disease changes turnover but lacks the classic pseudofracture pattern. Scurvy produces different radiographic signs from defective collagen, such as the white line of Frankel and subperiosteal reactions, not Looser zones. Hence, the appearance of pseudofractures points to osteomalacia.

Looser zones are pseudofractures due to defective mineralization of osteoid in adults, most characteristic of osteomalacia. In osteomalacia the bone matrix is laid down but fails to mineralize properly, often from vitamin D deficiency or phosphate abnormalities. This creates transverse, lucent bands at the cortex with sclerotic margins—microfractures that occur at sites of recurrent stress and heal poorly because mineralization is impaired. These lines commonly appear in weight-bearing bones and near joints.

Osteoporosis primarily shows reduced bone density without these lucent cortical bands. Hyperparathyroidism without bone disease changes turnover but lacks the classic pseudofracture pattern. Scurvy produces different radiographic signs from defective collagen, such as the white line of Frankel and subperiosteal reactions, not Looser zones. Hence, the appearance of pseudofractures points to osteomalacia.