The reason the doctors canot find any reasons for the atrophy is that they don't treat the blocked meridians that cause this problem. Injuries can lead to diminished Chi (life force) flow in the meridians of the affected area. Without Chi, there can be no growth or repair. The main thing is to get the Chi-flow going through the meridians again that pass through the leg, such as the stomach, liver, spleen, bladder, gallbladder and kidney meridians. There are various ways to do this, including Shiatsu (a form of acupressure), acupuncture, Yoga, squatting (as described in my book Timeless Secrets of Health & Rejuvenation) and, of course, Ener-chi Art (see my website for details).