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As per your history the problem has been long standing for around five months or more. I advise you to visit a nearest physiotherapist to start and continue knee physiotherapy. Abstain from sporting activity for a few weeks. If after around four to six weeks your symptoms do not improve, then my advice is to go for MRI of the affected knee for possible ligaments or meniscal lesion like cysts or any synovial changes.
The Probable causes:
Sprain of knee.Investigations to be done:
MRI knee.Differential diagnosis:
1. Synovial hypertrophy.Treatment plan:
Continue physiotherapy and hot fomentation of knee thrice daily with local application of Diclofenac gel. Use a knee cap on the affected site during activity.Preventive measures:
Avoid sporting activities, stair climbing and squatting.