29 years Male complaining of pain and swelling right knee Diagnosis

27/male, pain of knee joint for 3 month, unilateral, tender medial joint line, no h/o of trauma / fever/weight loss,Ray done. provisional diagnosis.and further investigations?

23yrs male. pain since 6yrs. swelling progressive. Unable to sit n restriced knee ROM. expert opinions pls.

A 34 y/o female c/o painless growth on rt don't since 1 year. Gradually progressing in nature...no swelling , no tenderness on examination What could be the diagnosis and management ?

WOMAN 58 YO WITH PAIN AT LEFT KNEE AND SWELLING, DIFFICULTY IN WALKING.