Abnormal knee morphology Knee joint effusion 2024-07-12T10:19:08Z Increased intra-articular amount of (synovial) fluid is not specific for a particular disorder, as can occur in a variety of settings but draws attention to the presence of a joint disorder, such as knee osteoarthritis, or rheumatoid arthritis. Abnormal accumulation of fluid within the knee joint or around the knee. Symptoms maye include, pain, swelling, and stiffness.