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To secure the bone so it can not shift while healing. With out a cast the likelihood of you jarring the bone out of place is higher, and thus it could heal incorrectly.

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Q: Why do doctorss put a cast on an arm or leg that has been broken?
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Related questions

Where is a broken arm often kept?

A broken arm is usually kept in a cast. sling


Where is a broken arm kept?

A broken arm is usually kept in a cast. sling


Where can you get a cast for a broken arm?

From the Doctor.


When do you wear a cast?

When you (for example) have broken your arm, they but a cast on it. lol


What a doctor puts on your arm or leg if broken?

cast


Why do doctores put cast on an arm or leg that has been broken?

they need it to be protected and so it will put your bone back in place.


Why do doctors put a cast on arm or leg that is broken?

the cast lets the broken bone stick together and it has to get used to it


Why did William only have one good arm?

His arm had recently been broken.


Did William have only one good arm?

His arm had recently been broken


Why does a doctors a cast on an arm or leg that has be broken?

the doctors put a cast on an arm or leg to immobilize the limb so it could heal adequately.


What will you do if you know your arm is broken?

see a doctor, have an X-ray, get it cast.


How long does a cast stay on a broken hand?

I'm sorry that you have a broken arm- how long the cast will be on, depends upon what type of a break it was, and also how long it has been on already. It's best if you ask your local hospital about this. GET WELL SOON!!