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Orthopaedics Metabolic disorders - 1 0f06eb10

Which of the following is true about pathophysiology of skeletal fluorosis?

A
Fluorine increases PTH levels by direct action
B
Fluoroappatite crystals are resistant to osteoclasts
C
Fluorine decreases vitamin D levels
D
Fluorine erodes bone, thereby decreasing bone density
High-Yield Explanation
Fluorosis: Excessive deposition of fluorine occurs in bone and soft tissues. Fluorine stimulates osteoblastic activityand fluoroappatite crystals are laid down in bone which are resistant to osteoclastic resorption. This leads to calcium retention, impaired mineralization and secondary hyperparathyroidism. Interosseousmembrane ossification is a diagnostic radiological finding in skeletal fluorosis The characteristic pathology involves Sub-periosteal new bone formation, Osteosclerosis(Most commonly seen veebrae, ribs and pelvis) Hyperostosis at the bony attachments of ligaments, tendons and fascia.

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