Abstract
The Knee injury and Osteoarthritis Outcome Score (KOOS) was developed as an extension of the WOMAC Osteoarthritis Index with the purpose of evaluating short-term and long-term symptoms and function in subjects with knee injury and osteoarthritis. The KOOS holds five separately scored subscales: Pain, other Symptoms, Function in daily living (ADL), Function in Sport and Recreation (Sport/Rec), and knee-related Quality of Life (QOL). The KOOS has been validated for several orthopaedic interventions such as anterior cruciate ligament reconstruction, meniscectomy and total knee replacement. In addition the instrument has been used to evaluate physical therapy, nutritional supplementation and glucosamine supplementation. The effect size is generally largest for the subscale QOL followed by the subscale Pain. The KOOS is a valid, reliable and responsive self-administered instrument that can be used for short-term and long-term follow-up of several types of knee injury including osteoarthritis. The measure is relatively new and further use of the instrument will add knowledge and suggest areas that need to be further explored and improved.
Highlights
Why assess Health-Related Quality of Life with the Knee Injury and Osteoarthritis Outcome Score (KOOS)? The main reason for developing a single instrument with the purpose of covering several types of knee injury and including osteoarthritis (OA), was that traumatic knee injuries often causes concomitant damage to multiple structures and frequently lead to the later development of OA
To ensure content validity for subjects with anterior cruciate ligament (ACL) injury, meniscus injury, and early OA, we reviewed the literature, consulted an expert panel, and conducted a pilot study (Fig. 1)
Knee injury and Osteoarthritis Outcome Score (KOOS) vs. WOMAC The KOOS was developed as an extension of the WOMAC Osteoarthritis Index with the overall purpose to evaluate short- and long-term symptoms and function after knee injury and OA
Summary
DFiegvuerloep1ment and evaluation of the KOOS Development and evaluation of the KOOS. An advantage when using the KOOS for studies of the long-term consequences of joint injury in such patients is that the KOOS assesses sport and recreation function and knee-related quality of life and has a greater responsiveness compared to other more generic instruments such as the WOMAC and the SF-36 (Fig 2). The patients experienced some pain, swelling and restriction in range of motion and had not pushed their knee during sporting activities This was reflected by (statistically non-significant) changes of 1 to 7 KOOS score points in pain, symptoms, and sport and recreation function over this time interval, compared to preoperative scores. The patients were back at more vigorous activities including sport and had few symptoms, reflected by (statistically significant) changes of 8–23 score points in all subscale scores. How can we obtain a scientific support during our study? Information is available at http://www.koos.nu
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