A fracture is a break in a bone. Understanding how fractures are classified and how bones repair themselves helps explain why accurate alignment and appropriate treatment matter.
A bone can heal after a fracture even if a physician does not reset it. However, if the bone heals while incorrectly aligned, it will remain deformed. Correctly restoring the bone’s anatomical position can therefore be important for proper healing.
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What is a fracture hematoma, and when does it form?
It is the clot formed from blood at the fracture site. It generally forms about six to eight hours after a bone breaks.
How do internal and external calli differ?
The internal callus forms between the broken ends from a fibrocartilaginous matrix produced by endosteal chondrocytes. The external callus forms around the outside of the break and includes hyaline cartilage and bone.
What happens during endochondral ossification in fracture repair?
Cartilage in the calli is replaced by trabecular bone, helping stabilize and repair the broken bone.
What is the difference between an open and a closed fracture?
In an open fracture, a broken bone end tears through the skin, creating a high risk of infection. In a closed fracture, the skin remains intact.
How can a femoral diaphysis fracture affect the lungs?
Fat globules may enter the bloodstream and lodge in lung capillary beds, causing respiratory distress that can be fatal without prompt treatment.
Quiz questions
What is a fracture?Answer: A break in a bone.
What distinguishes closed reduction from open reduction?Answer: Closed reduction repositions the bone without surgery; open reduction uses surgery to expose and reset it.
Which fracture type occurs when one fragment is driven into another?Answer: An impacted fracture.
Which fracture pattern runs straight across the bone’s long axis?Answer: A transverse fracture.
Why can a femoral diaphysis fracture cause respiratory distress?Answer: Fat globules may lodge in lung capillaries and impair breathing.
Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.