Martino is perhaps my favorite guitar player and musician of all time. Was listening to his new record Formidable just earlier today! I'm familiar with his story although for him it was a brain/memory thing. While I retained all my theory/knowledge I had to train my muscle memory all over again. In his case, he had all the muscle memory but couldn't remember ever knowing how to play at all. I recall that he started learning again by listening to his own records!