Minimal Clinically Important Difference and Patient-Acceptable Symptom State in Orthopaedic Spine Surgery: A Review.

»: Minimal clinically important difference (MCID) and patient-acceptable symptom state (PASS) are both metrics at interpreting patient-reported outcome measures (PROMs).

»: MCID values tend to vary significantly depending on the baseline pain and function in both acute and chronic symptom states while PASS thresholds are more stable.

»: MCID values are more easily attainable than PASS thresholds.

»: Although PASS is more relevant to the patient, it should continue to be used in tandem with MCID when interpreting PROM data.