ETA: I agree with Gidget, break and fracture mean the same thing, I was thinking more if it is hairline, compound fracture, etc.
After reading other responses, I agree...do not let him walk because of the growth plates!!!!!! Please, please, please contact your physician with specific questions.
Can he be moved (go to movies, visit others?), do you have a wheel chair for him so you can take him out?, can you arrange visitors to come play board games with him?coloring pages, new crayons, markers, etc?
I would think the nurses might also have some suggestions....
Good luck!
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Are you visiting or permanently living in Spain?
If you are visiting I would call my USA pediatrician and consult with him/her. Be ready to send info.
If you are in Spain did your child's regular doctor set the bone? If not I would be consulting with your child's regular doctor. If so, write down all the questions you have and then call the doctors office to get answers.
My experience is that children heal about 2 weeks faster then adults, but it depends on the type of break and health of child.
Was this a break or fracture? Why can't your child walk in the cast? Some lower leg fractures require walking to heal.
It is always best to consult with your doctor or trained physician.