Knee Injury and Osteoarthritis Outcome Score (KOOS)

Developed in 1994-1995

Roos EM, Roos HP, Ryd L, Lohmander LS. Substantial disability 3 months after arthroscopic partial meniscectomy: A prospective study of patient-relevant outcomes. Arthroscopy 2000; 16:619-26 (PubMed Abstract)

Roos EM, Roos HP, Lohmander LS. WOMAC Osteoarthritis Index--additional dimensions for use in subjects with post-traumatic osteoarthritis of the knee. Western Ontario and MacMaster Universities. Osteoarthritis Cartilage 1999; 7(2):216-2 (PubMed Abstract)

Roos EM, Roos HP, Ekdahl C, Lohmander LS. Knee injury and Osteoarthritis Outcome Score (KOOS)--validation of a Swedish version. Scand J Med Sci Sports 1998;8:439-48 (PubMed Abstract)

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; 28:88-96 (PubMed Abstract)

 free access
 with author’s written permission
 with fees for academic/non profit research
 with fees for commercial/pharmaceutical companies
 with the signature of a contract/agreement
 other

Available on www.koos.nu

The listed translations may not have undergone a full linguistic validation process and may require further work to be suitable for use in a study. This list is subject to constant changes, therefore please check the status of translations with Mapi Research Trust / the developers / copyright holders / distributors.

• Pain (9 items)
• Other symptoms (7 items)
• Activities of Daily Living function (17 items)
• Sport and recreation function (5 items)
• Knee-related quality of life (4 items)

Response options:
    Yes/no 
    5-point Likert scale
    Visual Analog Scale (VAS)
    Other
Available scores:
    Global score
    Scores by dimension ranging from 0 to 100
    Scores by items
Weighting:
    Yes 
    No
Score direction:
    Higher score = better QoL
    Lower score = better QoL

Scoring manual and User's Guide are available on www.koos.nu

    - Choice of the data collection method: Not detailed - Grade 1

    - Choice of the recall period: 1 week. Shortest thinkable where a clinical difference may occur and long enough to allow all functions to be performed during the recall time - Information provided by the author, Grade 2

    - Choice of the response options: according to WOMAC. A VAS was tried first, but the lengthy instructions to patients made authors switch to Likert-boxes - Information provided by the author, Grade 2

    - Evaluation of patient understanding: 

    - International issues (translatability): Not detailed - Grade 1

    - Choice of format, development of administration instructions and training: Not detailed - Grade 1

    - Identification of preliminary scoring of items and dimensions: Not detailed - Grade 1

    - Assessment of respondent and administrator burden: Not detailed - Grade 1

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; 28:88-96 (PubMed Abstract)

Information not specified for the population for which the instrument was developed

- ICC:0.85 for pain, 0.93 for symptoms, 0.75 for ADL, 0.81 for sport and recreation function, 0.86 for knee-related quality of life; p= not specified
- Population/Disease:Subjects about to undergo anterior cruciate ligament reconstruction; n= 13
- Was a definition of stability applied to identify stable patients:No
- Time frame or interval between the two administrations:9 days

Reference:
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; 28:88-96 (PubMed Abstract)

Information not specified for the population for which the instrument was developed

More information in:

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; 28:88-96 (PubMed Abstract)

Roos EM, Roos HP, Ekdahl C, Lohmander LS. Knee injury and Osteoarthritis Outcome Score (KOOS)--validation of a Swedish version. Scand J Med Sci Sports 1998;8:439-48 (PubMed Abstract)

Interpretability

Minimal Important Difference (MID):8 to 10 may represent the MID
Reference:
Roos EM, Lohmander LS. The Knee injury and Osteoarthritis Outcome Score (KOOS): from joint injury to osteoarthritis. Health Qual Life Outcomes. 2003 Nov 3;1(1):64 (Full text article)

Roos EM, Roos HP, Ryd L, Lohmander LS. Substantial disability 3 months after arthroscopic partial meniscectomy: A prospective study of patient-relevant outcomes. Arthroscopy 2000; 16:619-26 (PubMed Abstract)

Roos EM, Roos HP, Lohmander LS. WOMAC Osteoarthritis Index--additional dimensions for use in subjects with post-traumatic osteoarthritis of the knee. Western Ontario and MacMaster Universities. Osteoarthritis Cartilage 1999; 7(2):216-2 (PubMed Abstract)

Roos EM, Roos HP, Ekdahl C, Lohmander LS. Knee injury and Osteoarthritis Outcome Score (KOOS)--validation of a Swedish version. Scand J Med Sci Sports 1998;8:439-48 (PubMed Abstract)

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; 28:88-96 (PubMed Abstract)

- KOOS website

- See(PubMed results)