Low bone density, also known as osteopenia, osteoperia or pre-osteoporosis, is technically not a disease but an indication your child's bone mineral density is below normal. Children with osteopenia are more likely to develop osteoporosis if something is not done to stop bone loss. Low bone density usually progresses until diagnosed after a fracture (broken bone), and people with low bone density are more likely to break a bone compared to people with normal bone density.
A painless noninvasive bone density test is used to determine whether your child has normal bone density, low bone density or osteoporosis. If your child has weak or thin bones, medication may be necessary. Preventive measures include getting enough calcium, vitamin D and exercise.