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A multiaxial joint (polyaxial joint or triaxial joint) is a synovial joint that allows for several directions of movement. [9] In the human body, the shoulder and hip joints are multiaxial joints. [10] They allow the upper or lower limb to move in an anterior-posterior direction and a medial-lateral direction.
This membrane lines joints that possess cavities, known as synovial joints. The condition is usually painful, particularly when the joint is moved. The joint usually swells due to synovial fluid collection. Watercolour drawing of acute synovitis of the knee joint, showing the beginnings of the disintegration of the cartilage of the internal ...
Age. The risk of most causes of joint pain increases with age. This may be due to increased wear and stress on joints over time and a higher likelihood of other underlying medical conditions ...
Synovial joints, joints that are not directly joined, are lubricated by a solution called synovial fluid that is produced by the synovial membranes. This fluid lowers the friction between the articular surfaces and is kept within an articular capsule, binding the joint with its taut tissue. [6]
The TMC joint is a synovial joint between the trapezium bone of the wrist and the metacarpal bone at the base of the thumb. This joint is a so-called saddle joint (articulatio sellaris), unlike the CMC joints of the other four fingers which are ellipsoid joints. [17] This means that the surfaces of the TMC joint are both concave and convex.
Osteoarthritis (OA) is a type of degenerative joint disease that results from breakdown of joint cartilage and underlying bone. [5] [6] It is believed to be the fourth leading cause of disability in the world, affecting 1 in 7 adults in the United States alone. [7]
The inner lining of the joint consists of the synovium (also called the synovial membrane), a thin layer located between the joint capsule and the joint cavity. The word "synovium" is derived from the word "synovia" (or synovial fluid ), which is a clear, viscous fluid produced by the synovium, and its main purpose is to reduce friction between ...
In Rheumatoid arthritis the production of synovial fluid decreases, gradually causing pain, swollen joints, and stiffness. A forceful push causes friction and can dislocate the joint. Notably, joint instability in the neck is a potential complication of rheumatoid arthritis. [16]