| Name of the Instrument/Tool | Knee injury and Osteoarthritis Outcome Score (KOOS-12) |
| First Description |
Gandek B, Roos EM, Franklin PD, Ware JE Jr. Item selection for 12-item short forms of the Knee injury and Osteoarthritis Outcome Score (KOOS-12) and Hip disability and Osteoarthritis Outcome Score (HOOS-12). Osteoarthritis Cartilage. 2019 May;27(5):746-753 |
| Year | 2019 |
| Domains | |
| Concept of constructs | Health related quality of life, Physical function, Pain |
| Population/Disease | Disease specific |
| Originally developed for | Osteoarthritis (OA) |
| Other rheumatic diseases where can be applied (only if validated) |
--- |
| Additional population with no rheumatic diseases |
Yes Joint replacement Surgery |
| Language: Originally published in | English |
| Available in Language | Persian, Swedish, Spanish |
| REFERENCE IDENTIFICATION | |
| Author/s | Gandek B, Roos EM, Franklin PD, Ware JE Jr. |
| Title | Item selection for 12-item short forms of the Knee injury and Osteoarthritis Outcome Score (KOOS-12) and Hip disability and Osteoarthritis Outcome Score (HOOS-12) |
| Journal | Osteoarthritis Cartilage |
| Year | 2019 |
| Vol | 27 |
| Num | 5 |
| Pages | 746-753 |
| Country | USA |
| Language | English |
| Other references of interest | |
| Link | https://pubmed.ncbi.nlm.nih.gov/30716536/ |
| Brief Description |
A 12-item short form of the Knee injury and Osteoarthritis Outcome Score (KOOS-12): tests of reliability, validity and responsiveness |
| Link | https://pubmed.ncbi.nlm.nih.gov/33727118/ |
| Brief Description |
Performance of the HOOS-12 and KOOS-12 instruments for evaluating outcomes from joint replacement surgery |
| Link | https://pubmed.ncbi.nlm.nih.gov/33676016/ |
| Brief Description |
Implications for research and clinical use from a Rasch analysis of the HOOS-12 and KOOS-12 |
| Instrument/Tool Translations References | |
| Link | https://pubmed.ncbi.nlm.nih.gov/32948971/ |
| Brief Description |
Psychometric properties of the 12-item Knee injury and Osteoarthritis Outcome Score (KOOS-12) Spanish version for people with knee osteoarthritis |
| Link | https://pubmed.ncbi.nlm.nih.gov/33493653/ |
| Brief Description |
Does change in language change the properties of a shortened score previously validated in its complete version? Validation of the French versions of the HOOS-12 and KOOS-12 scores in primary knee and hip arthroplasties |
| Link | https://pubmed.ncbi.nlm.nih.gov/32300847/ |
| Brief Description |
The KOOS-12 shortform shows no ceiling effect, good responsiveness and construct validity compared to standard outcome measures after total knee arthroplasty |
| DEVELOPER CONTACT INFORMATION | |
| Correspondence to | Barbara Gandek |
| barbara.gandek@umassmed.edu | |
| Address | University of Massachusetts Medical School, Worcester, MA, USA; John Ware Research Group, Watertown, MA, USA |
| Website | http://koos.nu/ |
| Available | --- |
| Links | --- |
| DESCRIPTION OF THE INSTRUMENT | |
| Type Of Measure | Questionnaire |
| Brief Description |
KOOS-12 is a 12-item measure derived from the original 42-item Knee injury and Osteoarthritis Outcome Score (KOOS). |
| Number of Items | 12 |
| Range | 0-100 |
| Responses options/scale |
Yes All items are rated on a 5-point Likert scale (0–4) |
| Developed for | Both |
| PRACTICAL APPLICATION | |
| Method of administration | Interviewer/assessor, Self-administered |
| Recommendations to score |
Each item is scored from 0 to 4, left to right, with 0 representing no knee problems and 4 representing extreme knee problems. The separate KOOS-12 Pain, Function and QOL scale scores are calculated using the method of summated ratings, in which item responses in a scale are simply summed. At least half of the items (i.e. a minimum of 2 items) in the scale must be answered to calculate a scale score, and a person-specific estimate is imputed for any missing item data. KOOS-12 scale scores are transformed so 0 is the worst possible and 100 is the best possible score. The KOOS-12 Summary knee impact score is calculated as the average of the KOOS-12 Pain, KOOS-12 Function and KOOS-12 QOL scale scores. A Summary impact score is not calculated if any of the three scale scores are missing. |
| Score Interpretation | The KOOS-12 Summary impact score also ranges from 0 to 100, where 0 is the worst possible and 100 is the best possible score |
| Cut-off points | --- |
| Cut-off points applied to | --- |
| Smallest detectable change if described | --- |
| Smallest detectable change applied to | --- |
| Completion time by the patient | - minutes |
| Scoring time by the assessor | - minutes |
| Training to score | Not necessary |
| Strengths | Useful in clinical practice & research, Widely used, Easy to use |
| Limitations | --- |
| OTHER COMMENTS | |
| Other Comments | --- |