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Knee effusion, informally known as water on the knee, occurs when excess synovial fluid accumulates in or around the knee joint. It has many common causes, including arthritis , injury to the ligaments or meniscus , or fluid collecting in the bursa , a condition known as prepatellar bursitis .
Septic arthritis is the purulent invasion of a joint by an infectious agent [5] [6] with a resultant large effusion due to inflammation. [7] Septic arthritis is a serious condition. It can lead to irreversible joint damage in the event of delayed diagnosis or mismanagement. It is basically a disease of children and adolescence. [6]
The patellar tap is a technique used in an examination of the knee to test for knee effusion or "water-on-the-knee". [1] With the examinee lying on their back, the examiner extends the knee and presses the area above the kneecap with the palm of one hand. This pushes fluid under the kneecap and lifts it.
Repeated, periodic joint effusions of the knee. Usually one knee is affected but sometimes both knees. Other joints may also be involved along with the knee. Effusions are large, restricting range of motion but significant pain is not a feature. There is usually stiffness. Tenderness of the joint may or may not be present. [1]
The knee bursae are the fluid-filled sacs and synovial pockets that surround and sometimes communicate with the knee joint cavity. The bursae are thin-walled, and filled with synovial fluid . They represent the weak point of the joint, but also provide enlargements to the joint space. [ 1 ]
Symptoms may include knee pain, swelling, and redness just below the kneecap. [2] It may be complicated by patellar tendonitis. [1] Risk factors include kneeling or crawling. [4] It may also be brought on by frequent bending of the knees while standing, squatting, running, or jumping.
The fabella sign is displacement of the fabella that is seen in cases of synovial effusion and popliteal fossa masses. [1]The fabella is an accessory ossicle located inside the gastrocnemius lateral head tendon on the posterior side of the knee, in about 25% of people.
Chondromalacia patellae (also known as CMP) is an inflammation of the underside of the patella and softening of the cartilage.. The cartilage under the kneecap is a natural shock absorber, and overuse, injury, and many other factors can cause increased deterioration and breakdown of the cartilage.