A swelling in the space behind the knee (the popliteal space). The swelling is composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Commonly called Baker’s cyst.
- Synovial lining
The lining of the joints, normally only one or two cell layers thick, that is responsible for the production of the joint fluid. Also known as synovium.
- Synovial fluid
The slippery fluid that lubricates joints. Also known as synovia.
- Synovial membrane
A layer of connective tissue that lines the cavities of joints, tendon sheaths, and bursae and makes synovial fluid, which has a lubricating function.
- Synovial osteochondromatosis
A disorder of a joint that features a change of the normal synovial lining’s cellular structure to form bone-cartilage tissue. Synovial osteochondromatosis is uncommon and typically seen in young to middle-aged adults. Synovial osteochondromatosis leads to pain in the affected joint as well as limitation of the range of motion and often locking. The cause […]
- Synovial sarcoma
A malignant tumor of soft tissue that arises near, but not in, a joint. Synovial sarcomas most often occur in adolescents or young adults, are typically slow-growing, and may escape notice until they become painful. They occur mainly in the arms and legs, near large joints, especially the knees. Although the tumor is called synovial […]