Hi Thanks for your query and Welcome to Lybrate. I am Dr Akshay from Fortis Hospital, New Delhi. It is difficult to actually answer your question right now without examining your knee, but if there is an effusion inside your knee with no other joint being involved and no other issues like an inflammatory joint disease, then i will recommend two things to you : - Kindly get blood tests like CBC, ESR and CRP levels done to rule out an inflammatory or an infective pathology - If blood tests are ok , then a repeat MRI scan may be required to look for a meniscal or a ligamentous pathology. Till that time you can start with an anti inflammatory medication as per your body s suitability, intensive ice packs for local application, give rest to affected knee ( You can use a Knee brace for 10-14 days) If your symptoms do not improve, then we will have to get these tests done . Also make sure that there are no systemic s/s like fever, skin redness, local increase in temperature etc. Do not hesitate to contact me if you need any further assistance. You can also discuss your case and treatment plans with me in a greater detail in a private consultation. Thanks & Regards Dr Akshay Kumar Saxena Consultant Orthopaedics Fortis Hospital, New Delhi