Reference data and factors linked to the knee injury and osteoarthritis outcome score (KOOS) and KOOS-Child

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Reference data and factors linked to the knee injury and osteoarthritis outcome score (KOOS) and KOOS-Child

Baldwin JN and colleagues conducted an observational study to generate normative reference data for the KOOS and KOOS-Child and to investigate socio-demographic, psychological and physical factors associated with the knee pain and disability among healthy adults. The knee injury and osteoarthritis outcome score (KOOS) is a self-administered disease-specific measure created to evaluate the patient-reported knee outcomes in adults with joint injury or degenerative disease and KOOS-Child for children.

The study involved healthy individuals within the 1000 Norms Project (aged 8–101 years) and participants were provided with KOOS or KOOS-Child (each containing five sub-scales) and they self-reported all the observations. Observations to be collected included self-efficacy, physical activity, body mass index (BMI), lower limb alignment, knee frontal plane projection angle (FPPA), knee range of motion (ROM), knee and hip strength, six-minute walk, 30-second chair stand and timed up and down stairs tests. To dichotomize the KOOS data, cut-off scores were used, and logistic regression analysis was performed for each sub-scale.

sSocio-demographic characteristics were found to be comparable to the Australian population. For children (8–17 years) and adults (18–101 years), normative reference data was generated. Female adults were found twice in number to report about knee pain, symptoms and sport/recreation (Sport/Rec) limitations comparative to males (p <0.05). It was found that the criteria of older age, lower self-efficacy, greater BMI, varus lower limb alignment, lower knee flexion ROM and lower external hip rotation (ER) strength were independently related to knee pain and disability among adults.

Therefore, for the KOOS and KOOS-Child, age and gender-stratified reference data were generated to guide interpretation of results in practice and research for individuals with knee disorders. Psychological and physical factors were linked to self-reported knee pain/disability among adults. Moreover, to investigate the causation, we still require more longitudinal studies.


Osteoarthritis and Cartilage

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Original title of the article:

Self-reported knee pain and disability among healthy individuals: reference data and factors associated with the Knee injury and Osteoarthritis Outcome Score (KOOS) and KOOS-Child


Baldwin JN McKay MJ et al.

Exploratory, Knee Pain, Knee, Observational Study, KOOS, FPPA, ROM
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