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Abstrak: Latar belakang: Osteoarthritis adalah salah satu kelainan muskuloskeletal yang paling sering dijumpai di seluruh dunia dan merupakan penyebab utama impairment dan disabilitas. Latihan Open Kinetic Chain adalah gerakan yang menitik beratkan pada gerakan sendi dengan segmen distal bergerak dan segmen proksimal tetap. Closed Kinetic Chain adalah suatu latihan gerak aktif yang melibatkan beberapa kelompok otot sekaligus dan beberapa sendi (multipel joint), latihan closed kinetic chain lebih aman bagi sendi terutama sendi lutut yang rentan terhadap stres dan cedera. Metodologi: Penelitian eksperimen atau percobaan adalah percobaan yang bertujuan untuk mengetahui suatu gejala atau pengaruh yang timbul akibat dari adanya perlakuan tertentu. Jenis penelitian ini adalah penelitian Quasi Eksperimen Design one group pre test post test dengan metode pendekatan pretest-posttest untuk melihat perbandingan sebelum dan sesudah latihan open kinetic chain dengan latihan closed kinetic chain terhadap peningkatan kemampuan fungsional osteoarthritis knee di RSOMH Bukittinggi tahun 2022. Hasil: Hasil uji statistic paired T Test diperoleh latihan open kinetic chain p = 0,002 (p 0,05) dapat disimpulkan bahwa ada pengaruh kemampuan fungsional sebelum dan sesudah diberikan latihan open kinetic chain sedangkan hasil uji statistic paired T Test diperoleh latihan closed kinetic chain p = 0,000 (p 0,05) dapat disimpulkan bahwa ada pengaruh kemampuan fungsional sebelum dan sesudah diberikan latihan closed kinetic chain. Kesimpulan: Berdasarkan hasil uji statistic paired T Test diperoleh p = 0,002 (p 0,05) dan p = 0,000 (p 0,05) menunjukkan bahwa ada pengaruh kemampuan fungsional sebelum dan sesudah diberikan latihan open kinetic chain dan closed kinetic chain.

Abstract: Background: Osteoarthritis is one of the most common musculoskeletal disorders worldwide and is a major cause of impairment and disability. Open Kinetic Chain Exercise is a movement that focuses on joint movement with the distal segment moving and the proximal segment fixed. Closed Kinetic Chain is an active motion exercise that involves several muscle groups at once and several joints (multiple joints), closed kinetic chain exercises are safer for joints, especially the knee joints which are prone to stress and injury. Methodology: Experimental research is an experiment that aims to determine a symptom or effect that arises as a result of a certain treatment. This type of research was a Quasi Experimental Design one group pre test post test with a pretest-posttest approach to see a comparison before and after open kinetic chain exercise with closed kinetic chain exercise to increase the functional ability of osteoarthritis knee at RSOMH Bukittinggi in 2022. Results: The results of the statistical paired T Test showed that the open kinetic chain exercise p = 0.002 (p 0.05) it can be concluded that there was an effect of functional ability before and after being given open kinetic chain training while the results of the paired T Test statistical test obtained closed kinetic chain training p = 0.000 (p 0.05) it can be concluded that there was an effect of functional ability before and after being given closed kinetic chain training. Conclusion: Based on the results of the statistical paired T Test, p = 0.002 (p 0.05) and p = 0.000 (p 0.05) showed that there was an effect of functional ability before and after being given open kinetic chain and closed kinetic chain exercises.