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Knee Injury and Osteoarthritis Outcome Score (KOOS)

Roos EM

ProQolid

Basic description

Developed in 1994-1995

Authors

Roos EM

Copyright
Without copyright
Objective
To assess Knee Injury and Osteoarthritis
Therapeutic area
  • Musculoskeletal Diseases
  • Wounds and Injuries
Therapeutic indication
  • Osteoarthritis
  • Knee Injuries
Type of Clinical Outcome Assessment (COA)
  • pro PRO
Original language(s)
  • English for the USA
  • Swedish for Sweden
Translations
43 translation(s)
Bibliographic reference(s) of the original questionnaire

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)


Contact and conditions of use

Authors

Roos EM

Institute of Sports Science and Clinical Biomechanics
University of Southern Denmark
Campusvej 55
DK-5230 Odense
Denmark
Email: eroos@health.sdu.dk

Ewa Roos Publications (PubMed)

Contact information

Conditions of use

 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

Review copy

Available on www.koos.nu

Languages

Original language(s)

  • English for the USA
  • Swedish for Sweden

Translations

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.

KOOS

Arabic for Egypt
Arabic for Saudi Arabia
Bengali for India
Chinese
Croatian for Croatia*
Czech for Czech Republic*
Danish for Denmark
Dutch for the Netherlands
English for Singapore
Estonian for Estonia
French for France
German for Austria*
German for Germany
Greek for Greece
Hindi for India
Icelandic for Iceland
Italian for Italy
Japanese for Japan
Kannada for India
Korean for Korea
Latvian for Latvia*
Lithuanian for Lithuania*
Malay
Malayalam for India
Marathi for India
Norwegian for Norway
Persian
Polish for Poland
Portuguese for Brazil
Portuguese for Portugal
Russian for Russia
Slovak for Slovakia*
Slovenian for Slovenia*
Spanish for Peru
Spanish for Spain
Spanish for the USA
Tamil for India
Telugu for India
Thai for Thailand
Turkish for Turkey
Ukrainian for Ukraine*
Urdu for India
Vietnamese for Vietnam
* Performed by Mapi

Descriptive information

Characteristics

Concept of interest
  • Health-Related Quality of Life - HRQL (incl. health status)
Number of items

42

Population for intended use
  • Adult
Population age range
13 to 79 years
Administration mode
  • Self-administered
Data collection mode
  • Paper and pen
Recall/Observation period
Last week
Time for completion
About 10 minutes

Domain(s) covered by the questionnaire

  • 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)

Scoring

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

Existence of a scoring/interpretation/user manual

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

Content validity documentation

We have given each item below a number to indicate the level of information we have available. Our key indicates the following:
- Grade 1: information not found
- Grade 2: information mentioned
- Grade 3: information documented
- Grade 4: information documented and access to the source materials provided/possible

Concept elicitation and Item generation

    Literature review: the KOOS is based on the WOMAC Osteoarthritis Index and a literature review - Grade 3    Instruments review - Grade 3    Focus group: Not detailed - Grade 1    In-depth interviews with patients - Grade 2    Health care professionals interviews: Orthopaedic surgeons and physical therapists from both Sweden and the USA - Grade 2

Instrument development

    - 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: 

                Readability / understanding - Grade 2                Analysis of patient interviews - Grade 1                Pilot-testing: Patients who had meniscus surgery 20 years previously; n=75 - Grade 2

    - 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

Identification of the conceptual framework

Not detailed - Grade 1

Instrument final version

     Modification(s) of items: item reduction, factor analysis, multi-trait analysis - Grade 2
     Re-testing of the final version of the instrument with patients - Grade 2

Bibliographic references

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)

Measurement properties

Reliability

Internal consistency reliability

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

Test-retest reliability (reproducibility)

- 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)

Validity

Clinical validity

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

Ability to detect change

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)

References and websites

Bibliographic reference(s) of the original questionnaire

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)

Related website(s)
Other bibliographic reference(s)

- See(PubMed results)