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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] They can be grouped into either communicating and non ...
The [deep] infrapatellar bursa is located under the patella, between the patellar ligament and the fibrous membrane of the joint capsule. It is communicating with the joint space in particular cases. Other less regularly present bursae include the subfascial prepatellar, the subtendinous prepatellar, and the subcutaneous prepatellar bursae.
A synovial bursa, usually simply bursa (pl.: bursae or bursas), is a small fluid-filled sac lined by synovial membrane with an inner capillary layer of viscous synovial fluid (similar in consistency to that of a raw egg white). It provides a cushion between bones and tendons and/or muscles around a joint. This helps to reduce friction between ...
Risk factors include other knee problems such as osteoarthritis, meniscal tears, or rheumatoid arthritis. [1] [3] [4] The underlying mechanism involves the flow of synovial fluid from the knee joint to the gastrocnemio-semimembranosus bursa, resulting in its expansion. [1] The diagnosis may be confirmed with ultrasound or magnetic resonance ...
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 .
These include the subacromial, prepatellar, retrocalcaneal, and pes anserinus bursae of the shoulder, knee, heel and shin, etc. (see below [broken anchor]). [1] Symptoms vary from localized warmth and erythema (redness) [1] to joint pain and stiffness, to stinging pain that surrounds the joint around the inflamed bursa. [citation needed]
Bursae are readily inflamed when irritated, as their walls are very thin. [7]: p. 22 Along with the pes anserine bursa, the prepatellar bursa is one of the most common bursae to cause knee pain when inflamed. [9] Prepatellar bursitis is caused by either a single instance of acute trauma to the knee
Sometimes they report weakness or decreased range of motion. The physician examines the knee in full extension, looking for tenderness in the medial knee joint and across the proximal, medial tibial region, and feels for tenderness along the medial tendons of the pes anserine when the knee is flexed at 90 degrees. [citation needed]