Knee Injury and Osteoarthritis Outcome Score (KOOS)
Measurable knee-related quality of life
The Knee Injury and Osteoarthritis Outcome Score (KOOS) is a 42-item tool for evaluation of knee-specific health that was developed in 1998. With its 5 dimensions (pain, symptoms, activities of daily living, sport/recreation function and knee-related quality of life) and the high number of items, the questionnaire allows a detailed assessment of knee-related outcomes in patients.
The KOOS has application in orthopedic patients undergoing various medical interventions, for example patients with osteoarthritis and cartilage lesions of the knee, as well as patients who have undergone total knee replacement and anterior cruciate ligament reconstruction.
Items - Dimension - Completion time
A score is calculated for each dimension. Each response is scored from 0 to 4 points, 4 being the response associated with the worst health status. The scores are calculated as follows:
KOOS pain = 100 − mean score (P1−P9)×100/4
KOOS symptoms = 100 − mean score (S1−S7)×100/4
KOOS ADL = 100 − mean score (A1−A17)×100/4
KOOS sport/recreation = 100 − mean score (SP1−SP5)×100/4
KOOS quality of life = 100 − mean score (Q1−Q4)×100/4
A dimension score can still be calculated if up to 50% of items in a dimension have not been answered: These items are given the average score for the dimension items. If more than 50% of items in a dimension have not been answered, the dimension score will be invalid and should not be calculated. 9 12
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Collins, Natalie J., et al. “Measures of knee function: international knee documentation committee (IKDC) subjective knee evaluation form, knee injury and osteoarthritis outcome score (KOOS), knee injury and osteoarthritis outcome score physical function short form (KOOS‐PS), knee outcome survey activities of daily living scale (KOS‐ADL), Lysholm Knee Scoring Scale, Oxford Knee Score (OKS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), Activity Rating Scale (ARS), and Tegner Activity Score (TAS).” Arthritis care & research 63.S11 (2011): S208-S228.