First you need to be clinically evaluated for your symptoms and signs. And then a standing knee X-ray to evalute the grade of Osteoarthritis. 

Grade 1,2 and upto 3 - stem Cell therapies like PRP, ACS ADMSCs can be tried. But there is no guarntee

Grade 4 Osteoarthritis will require Total Knee Replacement 

Other things to be noted - You might be having Meniscus root tear or other pathologies which might need MRI for evaluation and treatment

Dr Rufus Vasanth Raj

knee osteoarthritis treatment department on x ray garding and clinical examination ..stem cell might helpful in grade 1 and 2 but not proven. knee replacement is best option for grade 3 and 4 (tri-compartmet OA) for further details contact us...