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If it takes a bone 1 year to fully heal why do you think we only...

If it takes a bone 1 year to fully heal why do you think we only wear a cast for 6 weeks?

Science   Anatomy-And-Physiology   
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Answer #1

Following are the stages of FRACTURE HEALING:

1. Stage of Hematoma

2. Stage of granulation tissue

3. Stage of Callus (Earliest at 3 weeks)

4. Stage of Consolidation (Clinically bone is united)

5. Stage of Remodelling.

At stage 4 the bone is now clinically united which is between 6-8 weeks after the fracture. After that, stage of remodeling occurs which involves a process of readaptation of the skeleton to the loads which will be applied to it. This involves replacement of woven bone by lamellar bone. It take months for a bone to remodel completely. So at upto stage 4, plaster cast is required as before this stage the bones are not united and they require a support for proper union.

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