Hi there,
Here is a case of Hirayama's disease (also known as Juvenile Muscular Atrophy of the Unilateral Upper Extremity )of a 16 year old boy who had undergone surgery. Cheer up and do not lose hope, things will be fine. Prior to your surgery, do some visualization & relaxation exercise. Goodluck to you and take care!!
Here's the link:http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract
Regards,
Charlize29