<![CDATA[Falls are a major health problem in older adults and often lead to injury, hospitalization, loss of independence, and long-term care. Older adults with knee osteoarthritis (OA) are more likely to fall because pain, joint stiffness, and muscle weakness disturb balance and mobility. Physical activity can be modified, yet its relationship with balance, mobility, and fall risk in Indonesian patients with knee OA has rarely been examined. This study analyzed the association of physical activity with dynamic balance, functional mobility, and fall risk in older adults with knee OA. We conducted an analytical observational cross-sectional study at the Internal Medicine Clinic of Embung Fatimah Regional General Hospital, Batam City, from February to March 2026. Forty women aged 60 years or older with knee OA were recruited by total sampling. Physical activity was assessed with a questionnaire, dynamic balance and functional mobility with the Timed Up and Go Test (TUGT), and fall risk with the one-year fall history and a standardized fall-risk scale. Associations were tested with the Chi-square test and confirmed with the Fisher-Freeman-Halton exact test. Most participants had moderate physical activity (57.5%), impaired dynamic balance (85.0%), good functional mobility (55.0%), and high fall risk (67.5%). Physical activity was significantly associated with dynamic balance (p = 0.016) but not with functional mobility (p = 0.058) or fall risk (p = 0.158). None of the participants with low physical activity had good balance. These findings indicate that the level of physical activity is linked to the ability to keep balance while moving in older adults with knee OA.]]>
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