Hip
Hip osteoarthritis
Hip osteoarthritis is measured with a hip-specific patient-reported outcome score before and after arthroplasty, supported by a radiographic grade for structural severity.
What you are actually deciding
The HOOS separates pain from function from quality of life, which matters because they recover at different rates after arthroplasty. Radiographic grade guides the conversation about structural disease but should not drive the decision on its own.
Patient-reported outcome measure3
- HOOS Calculator40 itemsHip disability and Osteoarthritis Outcome ScoreThe HOOS is a 40-item patient-reported questionnaire that scores hip function as five separate subscales — Symptoms, Pain, Activities of Daily Living, Sport and Recreation, and Hip-related Quality of Life — each from 0 (extreme problems) to 100 (no problems).
- HOS Calculator26 itemsHip Outcome ScoreThe Hip Outcome Score is a 28-item patient-reported questionnaire for non-arthritic hip conditions that yields two independent percentage scores — an Activities of Daily Living subscale, administered as 19 questions of which 17 are scored, and a 9-item Sports subscale — each running from 0% (unable to perform the listed activities) to 100% (no difficulty at all).
- Oxford Hip Score12 itemsOxford Hip ScoreThe Oxford Hip Score is a 12-item patient-reported questionnaire about hip pain and everyday function over the past four weeks, each item scored 0 to 4 and summed to a total of 0 to 48 in which 48 represents the best possible hip — it is licensed by Oxford University Innovation, so the item wording is not reproduced here.
Clinical calculator1
Classification system1
Thresholds that apply here
Published change thresholds across the instruments above. Check the population matches your patient before using a value — a threshold derived in a different cohort will mislead you.
| Instrument | Type | Value | Subscale | Population |
|---|---|---|---|---|
| Harris Hip Score | MCID | ≈ 18 points | — | Total hip arthroplasty |
| HOOS | MCID | 10 points | All subscales | Total hip arthroplasty |
| HOOS | MCID | ~9 points | Pain | Hip osteoarthritis, non-surgical |
| HOOS | PASS | ~73 points | Pain | Hip arthroscopy for FAI |
| HOOS | MDC | 10–16 points | Varies by subscale | Hip osteoarthritis |
| HOS | PASS | ≈ 87% | Activities of Daily Living | Arthroscopic surgery for femoroacetabular impingement |
| HOS | PASS | ≈ 75% | Sports | Arthroscopic surgery for femoroacetabular impingement |
See the full threshold database for every instrument on the site.