Of all my surgeries the lengthenings have been the easiest. The only thing for me is I've had significant and lasting weakness afterward. Especially after I had my hamstrings done which was 7.5 years ago. I never regained the strength I had prior to surgery, but I can straighten my legs so that's a plus. I wish I could give you some insight on SDR, but I've never had it done. In hindsight I think I would have liked to try it instead of all the ortho surgeries I've had.