Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Juvenile osteoporosis ?
    ### Response:
    Juvenile osteoporosis is a condition of bone demineralization characterized by pain in the back and extremities, multiple fractures, difficulty walking, and evidence of osteoporosis. Symptoms typically develop just before puberty. Osteoporosis is rare in children and adolescents.
    