Question:

Diagnostic sign of a fracture:

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Which sign can only occur if the bone is actually broken?
Updated On: Jun 24, 2026
  • Abnormal mobility at fracture site
  • Pain at the fracture site
  • Tenderness
  • Swelling
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The Correct Option is A

Solution and Explanation

Step 1: The clinical signs of a fracture are graded by how strongly they confirm the diagnosis. The unfailing or diagnostic (pathognomonic) signs are abnormal mobility, crepitus and bony tenderness over the break.

Step 2: Abnormal mobility means movement occurring at a point where there is normally no joint, which can only happen when the bone is broken. This makes it a true diagnostic sign.

Step 3: Pain, tenderness and swelling are common but non-specific, as they also occur with soft tissue injuries and sprains. Hence abnormal mobility at the fracture site is the best answer.
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