As I am not an orthopedic expert, I cannot tell you exactly how they would straighten the ankle. Sometimes, a wedge of bone is taken out to reangulate the bone/joint called an 'osteotomy'
I do not know any orthopedic surgeons in Austin
CMT can affect the knees due to chronic denervation of the knee joints. The lack of sensory input from the know can result in repeated episodes of trauma. This can result in a "Charcot" joint, that is, deformed and non-funtional. I do not know if your knees are "Charcot joints" or whether they are just arthritic. A charcot joint would be more difficult to manage surgically. If pure osteoarthritis is present and there are indication for surgery, then surgery may be of benefit