Efek kuratif ekstrak etanol 70 daun babandotan (ageratum conyzoides l.) terhadap kartilago artikular pada tikus model osteoartritis yang diinduksi natrium iodoasetat = Curative effect of 70 ethanolic extract of babandotan leaves (ageratum conyzoides l.) on articular cartilage in osteoarthritis rat induced by natrium iodoacetate