HUBUNGAN DERAJAT KEPARAHAN DENGAN DAYA TAHAN OTOT QUADRICEPS PADA PENDERITA KNEE OSTEOARTRITIS DI KLINIK X KOTA SURABAYA

Introduction: Knee osteoarthritis is a degenerative joint disease characterized by pain, stiffness, and limited movement, as well as decreased muscle strength and endurance, particularly in the quadriceps muscles. Low muscle endurance in patients with knee osteoarthritis can worsen mobility function and quality of life. Purpose: This study aims to investigate the relationship between the severity of knee osteoarthritis and quadriceps muscle endurance in patients at the Medical Rehabilitation Center in X Clinic Surabaya City. Method: This study employs an analytical observational design with a cross- sectional approach. Data collection was conducted on 45 participants using purposive sampling, with the Lequesne Index used to measure severity and the 30- Second Chair Stand Test to assess quadriceps muscle endurance. Results: The chi-square test results showed a significance level of fisher’s exact test, P value =0,009 (<0,05), indicating a significant association between the severity of knee osteoarthritis and quadriceps muscle endurance. The higher the severity of the disease, the lower the muscle endurance of the patients Conclusion: These findings highlight the importance of muscle endurance- enhancing exercises to prevent functional decline in patients with knee osteoarthritis