Percentage of patients 18 years or older suffering from a lumbar spine (low back) injury who achieve the Minimal Clinically Important Difference (MCID) in the PROMIS Upper Extremity Computer Adaptive Testing. The MCID for PROMIS Physical Function is unique and validated for patients suffering low back functional deficits. This measure will be reported as the overall number of patients of rate 1 and rate 2 combined. To qualify, the patient must complete a baseline score and then one follow-up or discharge score. In order to fairly measure performance between providers' performance, the measure is risk-adjusted based on a proprietary assessment including age, sex, symptom characteristics, PROMIS baseline scores, social determinants of health, and psychosocial metrics. This measure will include three rates: 1) The number of non-surgical patients achieving a score change of 2.1 points in PROMIS Physical Function 2) The number of surgical patients achieving a score change of 2.1 points in PROMIS Physical Function 3) The overall performance rate of Rate 1 and Rate 2 combined