 After that short period, the patient, depending on circumstances and appropriateness, is either transferred to inpatient recovery or is linked to an intense outpatient exercise program and discharged from the hospital.According to clinicians, it usually takes about one year from the date of surgery to achieve maximum results from SDR.However, videos from St. Louis Children's Hospital website have shown continued marked improvement as much as five years post-surgery, and presumably, if the person keeps exercising intensely, potential for continued improvement and strengthening is, just as in a person born with normal muscle tone and range of motion, unlimited.