A 15-year-old boy has been walking abnormally since around the age of 9, unable to walk properly for three years now. Despite family efforts to seek medical help, the exact cause has not been diagnosed. Some doctors speculate it may be due to hereditary factors, but there are no similar cases in the family history. When he sits on a chair, there are no obvious abnormalities, and his body and limbs appear normal. The family is very worried and does not want him to suffer lifelong disabilities. What kind of disease might this be? Where can he receive effective treatment?