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Fractures - bone healing

Disclaimer: This fact sheet is for education purposes only. Please consult with your doctor or other health professional to make sure this information is right for your child.

What happens when children's bones break?

If children's bones break or are cut in surgery, it takes a while for the bone to heal. Skin and other tissues leave a scar when they heal, bones heal without scarring by forming new bone.

When the bone breaks there is bleeding from the ends as bone has a very good blood supply. The blood clots in between the two ends of the bone and is used by the body to start to build new bone.

Many new cells enter the area and new blood vessels are built to carry oxygen. Oxygen is needed for all body functions, including healing.

How does the bones reform?

The cells put fibrous (stringy) tissues and cartilage down in a lump called callus. This callus can be felt and seen on x-ray. The lump forms a weak type of bone, connecting the two ends. At this stage your child will no longer feel pain and the bone feels stronger. However, the bone is not as strong as normal and can re-break or bend at this early stage if your child is not careful. This stage is around four to six weeks after the first break.

The weaker bone is slowly replaced by normal bone and the bone looks and works as it did before the break. An increase in strength occurs between six weeks to three months after the break. The bone can even slowly straighten itself if it has healed slightly bent. This process is called remodelling and occurs until your child stops growing as a teenager.

How long your child needs to be in a plaster depends on which bone was broken. As a general guide, a broken arm can be out of the cast by about six weeks, but a leg may require longer. Each child is different and some may heal quicker or slower than others. After the cast is removed, your child is likely to have a stiff joint but this usually resolves over a few weeks without any need for treatment. You will need to be advised by your doctor when your child will be able to take part in activities like contact sport.

What is needed to help bone heal?

A normal diet is all that is needed for a child's bone to heal. Vitamin C and calcium are needed, but usually only in the amounts already found in healthy food. Medication has not been shown to help the bones healing.

• Your child's facture will heal without special diets or extra calcium.
• Your doctor's advice about the length of time before solid healing is based on the type and position of the break.
• Each child is different and some may heal quicker or slower than others.
• Make sure your child is careful and does not play contact sport until told by the doctor.
• Stiff joints are usually only temporary and regain mobility without treatment over intervals of a few days to several weeks.

The Children's Hospital at Westmead Tel: (02) 9845 3585 Fax: (02) 9845 3562 www.chw.edu.au	Sydney Children's Hospital, Randwick Tel: (02) 9382 1688 Fax: (02) 9382 1451 www.sch.edu.au	Kaleidoscope, Hunter Children's Health Network Tel: (02) 4921 3670 Fax: (02) 4921 3599 www.kaleidoscope.org.au