What is joint?

Joint is the point of connection between two or more bones; an articulation.
acromioclavicular j. Articulation between the lateral end of the collarbone and the acromion of the shoulder blade.
amphiarthrodial j. Joint in which the articulating surfaces are united by a disk of fibrocartilage, allowing only slight movement.
ankle j. See talocrural joint.
atlantoaxial j. Either of two articulations between the first and second cervical
vertebrae.
atlantoepistrophic j. Either of two joints at the neck: Lateral atlantoepistrophic j., the junction between the inferior articular processes of the first cervical vertebra and the superior articular processes of the second cervical vertebra. Median atlantoepistrophic j., the junction between the dens of the second cervical vertebra and the anterior arch and transverse ligament of the first cervical vertebra.
ball and scoket j. A type of synovial joint in which the globular end of one bone fits into the cuplike cavity of the other, permitting extensive movement in any direction, as seen in the hip and shoulder.
bicondylar j. Synovial joint in which two rounded condyles of one bone fit into two shallow cavities of another bone, as in the knee or temporomandibular joints, allowing all movement except rotation.
calcaneocuboid j. A saddle-shaped joint in the posterior portion of the foot between the front surface of the heel bone and the back surface of the cuboid bone.
capitular j. Articulation between the head of a rib and the bodies of two adjacent thoracic vertebrae.
carpometacarpal j. The plane joints between the carpal bones of the wrist and the second, third, fourth, and fifth metacarpal bones of the hand.
carpometacarpal j. of thumb Joint between the trapezium of the wrist and the first metacarpal bone of the hand.
Charcot’s j. Swollen, unstable but painless joint, frequently with destruction of intra-
articular ligaments and consequent abnormally increased range of motion; caused by loss of sensory innervation; considered a complication of a neurologic disorder.
costochondral j. Cartilaginous articulation between the anterior end of a rib and the lateral end of a costal cartilage.
cricothyroid j. Synovial joint between the side of the cricoid cartilage and the inferior
horn of the thyroid cartilage, permitting gliding and rotational movements.
cuneonavicular j. Articulation in the posterior portion of the foot between the front surface of the navicular bone and the back surfaces of the three cuneiform bones.
femoropatellar j. The part of the knee joint formed by the articulation between the back surface of the kneecap and corresponding anterior surface of the femur.
fibrous j. A type of joint such as syndesmosis, suture, and gomphosis in which fibrous
tissue unites two bones.
hinge j. A type of diarthrodial joint that permits only a forward and backward movement, as the hinge of a door.
hip j. The ball-and-socket joint between the head of the femur and the acetabulum of the hipbone.
intercarpal j.’s Joints between the carpal bones of the wrist.
interchondral j.’s Joints between the contiguous surfaces of the fifth through tenth costal cartilages.
intermetacarpal j.’s The plane joints between adjoining bases of the second through fifth metacarpal bones of the hand.
intermetatarsal j.’s The plane joints between adjoining bases of the five metatarsal bones of the foot.
intertarsal j.’s Joints between the tarsal bones in the posterior portion of the foot.
knee j. A compound condylar joint formed by the two condyles and patellar surface of the femur, the posterior surface of the kneecap, and the superior articular surface of the tibia.
lumbosacral j. The joint between the fifth lumbar vertebra and the sacrum.
metatarsophalangeal j.’s Ellipsoid joints at the front of the foot between the heads of the five metatarsal bones and the concave bases of the corresponding proximal phalanges.
plane j. A synovial joint in which the opposing articular surfaces are either flat planes or slightly curved; it allows gliding movements, as in the intermetacarpal joints.
radiocarpal j. The ellipsoid joint at the wrist between the radius and its articular disk, and the scaphoid, lunate, and triangular bones.
radioulnar j.’s The two articulations between the radius and the ulna: Distal radioulnar j., the joint between the rounded head of the ulna and the ulnar notch of the radius at the distal end of the forearm, near the wrist. Proximal radioulnar j., the joint between the head of the radius and the radial notch of the ulna within the annular ligament of the radius at the proximal end of the forearm, near the elbow.
rotary j. A type of synovial joint in which a pivot-like process fits and rotates within a ring that is formed partly of bone and partly of ligaments, as the proximal radioulnar articulation.
sacrococcygeal j. The joint between the sacrum and the tailbone.
sacroiliac j. Joint between the vertebral column and the pelvis, specifically between the two auricular surfaces on the upper part of the sacrum and each ilium on the posterior part of the pelvis.
sternoclavicular j. Joint formed by the medial end of the collarbone, the manubrium of the breastbone, and the cartilage of the first rib.
synovial j. A joint that usually permits free movement, composed of a layer of hyaline cartilage or fibrocartilage and a synovial cavity between the bones; includes most of the joints of the body.
talocalcaneonavicular j. Joint formed by the rounded head of the ankle bone, the concave surface of the navicular bone, the upper surface of the heel bone, and the plantar calcaneonavicular ligament.
talocrural j. Hinge joint formed by the tibia and fibula and the ankle bone. Also called ankle joint.
tarsometatarsal j.’s The three joints between the tarsal and metatarsal bones of the foot, involving a medial joint between the first metatarsal bone and the medial cuneiform bone; an intermediate joint between the second and third metatarsal bones and the intermediate and lateral cuneiform bones; and a lateral joint between the fourth and fifth metatarsal bones and the cuboid bone.
temporomandibular j. Synovial joint between the condyle of the mandible
inferiorly and the mandibular fossa and articular tubercle of the temporal bone superiorly;
separated by a thin articular disk into two cavities, each of which is lined by a synovial membrane.

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