| Name of the Instrument/Tool | Knee injury and Osteoarthritis Outcome Score (KOOS) |
| First Description |
Roos EM, Roos HP, Lohmander LS, Ekdahl C, Beynnon BD. Knee Injury and Osteoarthritis Outcome Score (KOOS)--development of a self-administered outcome measure. J Orthop Sports Phys Ther. 1998;28(2):88-96. |
| Year | 1998 |
| 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 |
No |
| Language: Originally published in | English |
| Available in Language | Slovak, Danish, English, Italian, Ukrainian, Slovenian, Polish, French, Estonian, Turkish, Czech, Russian, Norwegian, Spanish, Dutch, Portuguese, Lithuanian, German, Croatian, Swedish |
| REFERENCE IDENTIFICATION | |
| Author/s | Roos EM, Roos HP, Lohmander LS, Ekdahl C, Beynnon BD |
| Title | Knee Injury and Osteoarthritis Outcome Score (KOOS)--development of a self-administered outcome measure |
| Journal | The Journal of Orthopedic and Sports Physical Therapy |
| Year | 1998 |
| Vol | 28 |
| Num | 2 |
| Pages | 88-96 |
| Country | Sweden |
| Language | English |
| Other references of interest | |
| Link | https://pubmed.ncbi.nlm.nih.gov/27012756/ |
| Brief Description |
Systematic review and meta-analysis aiming to synthesize evidence regarding measurement properties of the KOOS |
| Link | http://www.ncbi.nlm.nih.gov/pubmed/18028282 |
| Brief Description |
Rasch analysis of the Knee injury and Osteoarthritis Outcome Score (KOOS): a statistical re-evaluation. |
| Link | https://pubmed.ncbi.nlm.nih.gov/23221356/ |
| Brief Description |
Review and summarize of the evidence regarding the psychometric properties of the KOOS in patients undergoing total knee arthroplasty. |
| Instrument/Tool Translations References | |
| Link | http://www.ncbi.nlm.nih.gov/pubmed/19303082 |
| Brief Description |
Cross-cultural adaptation and validation of the Portuguese version of the KOOS. |
| Link | http://www.ncbi.nlm.nih.gov/pubmed/17905602 |
| Brief Description |
Cross-cultural adaptation and validation of the French version of the KOOS. |
| Link | http://www.ncbi.nlm.nih.gov/pubmed/25335550 |
| Brief Description |
Cross-cultural adaptation and validation of the Greek version of the KOOS. |
| DEVELOPER CONTACT INFORMATION | |
| Correspondence to | Roos Ewa |
| eroos@health.sdu.dk | |
| Address | Institute of Sports Science and Clinical Biomechanics University of Southern Denmark Campusvej 55 DK-5230 Odense Denmark |
| Website | http://www.koos.nu/ |
| Available | --- |
| Links | --- |
| DESCRIPTION OF THE INSTRUMENT | |
| Type Of Measure | Questionnaire, Scale |
| Brief Description |
KOOS is an instrument that assesses patients' opinion about their knee and associated problems and is used in knee osteoarthritis (OA) and knee injury that can result in post traumatic OA; i.e. ACL (anterior cruciate ligament) injury, meniscus injury, chondral injury, etc. It covers domains as 1) pain, 2) other symptoms such as the severity of knee stiffness and the presence of swelling, grinding or clicking, catching, and range of motion restriction, 3) difficulty experienced during activities of daily living (ADL), 4) difficulty experienced with sport and recreational activities and 5) knee-related quality of life (QOL). |
| Number of Items | 42 grouped in 5 subscales |
| Range | 0-100 for each subscale (normalized scores); a total score is not recommended |
| Responses options/scale |
Yes All items are rated on a 5-point Likert scale (0–4) |
| Developed for | Clinical practice, Research |
| PRACTICAL APPLICATION | |
| Method of administration | Self-administered |
| Recommendations to score |
Each item is scored from 0–4. The 5 subscales are scored separately as the sum of all corresponding items. Scores are then transformed to a 0–100 scale (normalized score). A total score is not recommended. Scoring sheets (manual and computer spreadsheets) are provided on the web site |
| Score Interpretation | 0=extreme knee problems and 100=no knee problems |
| Cut-off points | --- |
| Cut-off points applied to | --- |
| Smallest detectable change if described | --- |
| Smallest detectable change applied to | --- |
| Completion time by the patient | 7-12 minutes |
| Scoring time by the assessor | 10 minutes |
| Training to score | Not necessary |
| Strengths | Useful in clinical practice & research, Widely used |
| Limitations | --- |
| OTHER COMMENTS | |
| Other Comments |
KOOS was created for people with a condition that may result in OA, thus KOOS should be valid for young and more active people and older and less active people. |