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<\/div>\n<\/div>\nThe largest number of movable joints in the body having a joint or synovial capsule filled with synovial membrane that secretes a viscous fluid called synovia containing glycoprotein, which serves to lubricate the smooth cartilage (articular) surfaces making contact with the two bones. Hence, it is sometimes referred to as a synovial joint. The classification of various diarthordial joints are given in the figure below<\/p>\n
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Diathrodial joints can be classified as simple (only two articulating surfaces; e.g., hip), compound (more articulating surfaces; e.g., wrist) and complex (two or more articulating surfaces, together with a fibrocaartilage; e.g., knee). Three diathrodial joints are illustrated: A. ball-and-socket (permits movement in three planes: abduction\/adduction, flexion\/extension, rotation; e.g., hip and shoulder joints), B. hinge (permits movement in flexion\/extension plane; e.g., interphalangeal joints of feet and hand), C. condyloid (permits movement in flexion\/extension plane and small rotations; e.g., knee). Other diathrodial joints are: ellipsoid joint (abduction\/adduction, flexion\/extension; e.g., radiocarpal articulation of wrist), plane (or gliding) joint (termed non-axial as it does not occur about an axis and consists of two flat surfaces that slide over each other to permit movement; e.g. carpal bones in hand), pivot joint (pronation, supination, rotation; e.g., superior and inferior radioulnar joints), and saddle joint (abduction\/adduction, flexion\/extension, small amount of rotation; only found in the carpometacarpal articulation of the thumb). Finally, the contact areas between the articulating surfaces vary so that movement occurs through a range of motion (D). Other types of joints are: synarthrodial (or fibrous) joints (held together by fibrous articulations; e.g., sutures of the skull) and ampiarthrodial (or cartilaginous) joints (held together by epiphyseal plates or fibrocartilage; e.g., pubic symphysis). As with the synarthroidal joints, they have very limited movement (except, for example, when the synarthrodial joints move in the passage of the fetal head during delivery).<\/p>\n
See Biomechanical degrees of freedom<\/a>, Delivery position (presentation), Glycoproteins<\/a>, Joint capsule<\/a>, Pelvis\/pelvic girdle <\/p>\n <\/p>\n <\/p>\n <\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":" The largest number of movable joints in the body having a joint or synovial capsule filled with synovial membrane that secretes a viscous fluid called synovia containing glycoprotein, which serves to lubricate the smooth cartilage (articular) surfaces making contact with the two bones. Hence, it is sometimes referred to as a synovial joint. The classification … <\/p>\n