PLAIN RADIOGRAPHIC GRADING OF PRIMARY KNEE OSTEOARTHRITIS USING THE KELLGREN–LAWRENCE SYSTEM AND ITS CORRELATION WITH CLINICAL SEVERITY: A CROSS-SECTIONAL STUDY. CDF [Internet]. 2022 Jul. 25 [cited 2026 Aug. 27];51(3):476-83. Available from: https://cuestionesdefisioterapia.com/index.php/es/article/view/4266