Skyline view of the patella demonstrating a large joint<unk>  as marked by the arrow Diagnostic tests include: Joint aspiration Also known as arthrocentesis, this procedure includes withdrawal of fluid from inside the knee for analysis such as cell count, culture for bacteria, and examination for crystals, such as uric acid or calcium pyrophosphate dihydrate ram crystals found in gout or pseudogout. Imaging X-ray of the knee of a 12 year old male, showing<unk>  of medium severity, marked by black arrows. It displaces the patella anteriorly and extends into the suprapatellar bursa. An X-ray is useful to verify that there is no break or dislocation when there is a history of trauma. May show signs of osteoarthritis. MRI Magnetic Resonance Imaging detects abnormalities of the bone or knee joint, such as a tear in the ligaments, tendons or cartilage. Blood tests If the knee is swollen and red and warm to the touch when compared to the other knee, a doctor may be concerned about inflammation due to rheumatoid arthritis or a crystalline arthritis, such as gout or pseudogout, or joint infection. Besides sending the joint fluid to a laboratory for analysis, blood tests may requested to determine a white blood cell count, erythrocyte sedimentation rate, and perhaps the level of C-reactive protein or uric acid. If blood tests reveal Lyme disease antibodies forming, the condition may be attributed to it.
Knee effusion
Knee pain
Round ligament pain
Joint effusion
Facet joint injection
Knee arthritis
Back pain
Ankle flare