Defining the Minimal Clinically Important Improvement, Substantial Clinical Benefit, and Patient Acceptable Symptom State for the iHOT-12, HOOS, and HOOS

backgroundScore cutoffs of clinically important outcome values such as the minimal clinically important improvement (MCII), substantial clinical benefit (SCB), and Patient Acceptable Symptom State (PASS) are population and treatment specific. In patients with nonarthritic hip-related pain, numerous score cutoffs have been calculated for use after surgical treatment, but they have not been established for patients who pursue nonoperative care. PURPOSE: To determine the MCII, SCB, and PASS score cutoffs for the 12-item International Hip Outcome Tool (iHOT-12), the Hip Disability and Osteoarthritis Outcome Score (HOOS), and an 8-item abbreviated version of the HOOS (HOOS STUDY

designCohort study; Level of evidence, 4.

methodsThe cohort included 15- to 40-year-old patients who were diagnosed with nonarthritic hip-related pain by a surgical or nonsurgical orthopaedic clinician and were advised to pursue nonoperative management at the time of evaluation. At baseline and 12-month follow-up, patients completed the iHOT-12, HOOS, and HOOS

resultsAmong 61 patients (mean age, 28 ± 8 years; 50 [82%] female), for the iHOT-12, the MCII score cutoff was 14, the SCB score cutoff was 18, and the PASS score cutoff was 63. For the HOOS subscales, the MCII score cutoffs ranged from 4 (Activities of Daily Living) to 13 (Sport and Recreation), the SCB score cutoffs ranged from 10 (Symptoms and Activities of Daily Living) to 25 (Quality of Life), and the PASS score cutoffs ranged from 50 (Quality of Life) to 87 (Activities of Daily Living). For the HOOS

conclusionThese clinically important outcome values can assist clinicians and researchers with interpreting patients' clinical change during nonoperative treatment for nonarthritic hip-related pain.