“…We congratulate the authors on this novel study. The use of ADI is relatively new in assessing outcomes in neurosurgery, but studies have shown that it is associated with recovery after surgery for subdural hematoma 2 and after ACDF. 3 The paper by Zhang et al 1 adds to this literature, showing, like the 2 aforementioned studies, that outcomes after lumbar spine surgery also correlate with a patient's ADI.…”