Synovial joints (or diarthroses, or diarthroidal joints) are the most common and most moveable type of joints in the body. As with all other joints in the body, synovial joints achieve movement at the point of contact of the articulating bones. Structural and functional differences distinguish the synovial joints from the two other types of joints in the body, with the main structural difference being the existence of a cavity between the articulating bones and the occupation of a fluid in that cavity which aids movement. Image File history File links Illu_synovial_joint. ... Image File history File links Illu_synovial_joint. ... For other uses, see Joint (disambiguation). ... This article is about the skeletal organs. ...
Types
Joint types 1. Ball and socket 2. Condyloid (ellipsoid) 3. Saddle 4. Hinge 5. Pivot
Condyloid joints (or ellipsoidal joints), such as the wrist. A condyloid joint is where two bones fit together with an odd shape (e.g. an ellipse), and one bone is concave, the other convex. Some classifications make a distinction between condyloid and ellipsoid joints.
Saddle joints, such as at the thumb (between the metacarpal and carpal). Saddle joints, which resemble a saddle, permit the same movements as the condyloid joints.
Hinge joints, such as the elbow (between the humerus and the ulna). These joints act like a door hinge, allowing flexion and extension in just one plane.
Pivot joints, such as the elbow (between the radius and the ulna). This is where one bone rotates about another.
Gliding joints (or planar joints), such as in the carpals of the wrist. These joints allow a wide variety of movement, but not much distance.
Joint resection involves removing a portion of the bone from a stiffened joint, increasing the space between the bone and the socket to improve the range of motion.
Joint resection and interpositional reconstruction do not always produce successful results, especially in patients with rheumatoid arthritis, a chronic inflammatory disease that may continue to narrow the joint space and accelerate the formation of scar tissue.
A joint that has undergone surgery is less stable than a healthy joint and dislocation or loosening of the resected joint may occur, especially with inappropriate physical activity.
Feeds |
Contact