Measurement Properties of the Turkish Version of the Patellofemoral Pain and Osteoarthritis Subscale of the KOOS

Study Overview
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Brief Summary
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The purpose of this study is to translate and culturally adapt the subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) into Turkish, and to determine the measurement properties of the Turkish version.

Detailed Description
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Patellofemoral pain and patellofemoral osteoarthritis are highly prevalent knee disorders associated with pain and functional limitations. Patient-reported outcome measures (PROMs) are suggested for clinical and research use; however, there is a lack of objective disease-specific PROMs for patellofemoral pain and osteoarthritis. The purpose of this study is to translate and culturally adapt the subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) into Turkish, and to determine the measurement properties of the Turkish version.

Official Title
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Translation, Cultural Adaptation, Reliability, and Validity of the Turkish Version of the Patellofemoral Pain and Osteoarthritis Subscale of the KOOS (KOOS PF)

Conditions
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Patellofemoral Pain Syndrome, Patellofemoral Osteoarthritis, PROMs

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: peripatellar or retropatellar knee pain persisting for at least 3 months and exacerbated by activities that load the patellofemoral joint; pain intensity of at least 3 mm according to the visual analogue scale (VAS) Exclusion Criteria: diffuse or generalized knee pain severe trauma to the target knee in the previous year moderate to severe concomitant tibiofemoral osteoarthritis recent knee injection (within 3 months) systemic inflammatory conditions

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| the subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) | The subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) is a disease-specific PROM designed to evaluate pain, stiffness, and quality of life in patients with patellofemoral pain and/or osteoarthritis. It has 11 items that assess three domains: stiffness (1 item), pain (9 items), and quality of life (1 item). Each item consists of five response options with a score between 0 and 4. The total score ranges from 0 (worst) to 100 (best). | first day | 
| the Kujala's Anterior Pain Scale (AKPS) | The Kujala's Anterior Pain Scale (AKPS) is a self-administered questionnaire designed for patellofemoral disorders. It consists of 13 items on symptoms and functional limitations. The total score ranges from 0 to 100, with higher values indicating less functional status | first day | 
| the Short Form-36 health survey (SF-36) | The short-form 36 (SF-36) health survey is a tool for assessing general health-related quality of life. It consists of 36 questions divided into eight domains, which are then merged under two large headings: physical component summary and mental component summary. The total score varies between 0 and 100. Higher ratings indicate a better quality of life. | first day | 
| the subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) | The subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) is a disease-specific PROM designed to evaluate pain, stiffness, and quality of life in patients with patellofemoral pain and/or osteoarthritis. It has 11 items that assess three domains: stiffness (1 item), pain (9 items), and quality of life (1 item). Each item consists of five response options with a score between 0 and 4. The total score ranges from 0 (worst) to 100 (best). | 7-14 days after | 
| the subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) | The subscale of the Knee Injury and Osteoarthritis Outcome Score for patellofemoral pain and osteoarthritis (KOOS-PF) is a disease-specific PROM designed to evaluate pain, stiffness, and quality of life in patients with patellofemoral pain and/or osteoarthritis. It has 11 items that assess three domains: stiffness (1 item), pain (9 items), and quality of life (1 item). Each item consists of five response options with a score between 0 and 4. The total score ranges from 0 (worst) to 100 (best). | 3 months after | 
| the global rating of change (GROC) | The global rating of change (GROC) score is a single-item questionnaire with five potential responses depending on the patient's change in knee pain following the initial assessment. Likert scale with five response options: 0 points (much worse), 1 points (slightly worse), 2 points (about the same), 3 points (slightly better), and 4 points (much better). | 3 months after | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Patellofemoral Pain Syndrome, Patellofemoral Osteoarthritis, Patient-reported outcome measures, PROMs, Validity, Reliability