Joint - definition and function

Joint - definition and function - picture

FragmentHealth.com » The Musculoskeletal System » Joint definition and function

Joint - An articulating structure that connects two or more BONE surfaces to allow movement. The movement may be slight or the joint fused, such as the sutures in the cranium (skull). A joint may function like a hinge, such as the knee and elbow, or like a ball and socket, such as the hip and shoulder. In the carpal (hand) and tarsal (foot) joints, the bones glide along each other. Synovial capsules enclose joints that allow extensive movement between the bone surfaces, such as the knees, hips, and shoulders. The synovial membrane produces synovial fluid, which lubricates the bone ends within the joint to reduce friction between or among the structures of the joint during movement. Joints are particularly vulnerable to injury and damage resulting from repetitious motion.

Health Conditions Involving the Joints
ADHESIVE CAPSULITIS ANKLE INJURIES
ANKYLOSING SPONDYLITIS ARTHROGRYPOSIS
CONGENITAL HIP DYSPLASIA CONTRACTURE
DISLOCATIONS EPICONDYLITIS
INFECTIOUS ARTHRITIS KNEE INJURIES
NEUROGENIC ARTHROPATHY OSTEOARTHRITIS
RHEUMATOID ARTHRITIS SYNOVITIS

For further discussion of joints within the context of the structures and functions of the musculoskeletal system, please see the overview section “The Musculoskeletal System.”

See also BURSA; JOINT REPLACEMENT; LIGAMENT; MUSCLE; OSTEOARTHRITIS; TENDON.

Resource: Facts On File Encyclopedia Of Health And Medicine

Each atricle being rated on a scale of 1 to 5 stars.
Please rate this article
Article Rating: 2,6 stars of 5

Discussion and opinions:

Insert your opinion:

Tweet this page

Other Articles

Arthroscopy procedure / surgery

The Musculoskeletal System |

What is Arthroscopy A MINIMALLY INVASIVE SURGERY procedure that allows an orthopedic surgeon to view the inside of a JOINT using a lighted, flexible endoscope adapted for this use, called an arthroscope. Arthroscopy, also called arthroscopic surgery, has both diagnostic and therapeutic applications. Inserted into the joint through a small incision, the

Meniscectomy and operation knee

The Musculoskeletal System |

Meniscectomy is surgical OPERATION to remove part or all of a damaged meniscus in the knee. Each knee has two menisci, C-shaped pads of CARTILAGE that cushion the ends of the femur (thigh BONE) and tibia (shin bone) as they come together within the knee JOINT. Meniscus tears are common ATHLETIC INJURIES and occur when there is torsion under pressure-the

Knee injuries

The Musculoskeletal System |

What is Knee Injuries and Definition Knee injuries - Sprains, strains, CARTILAGE tears, and fractures involving the structures of the knee. The knee is a hinge JOINT that allows the leg to flex (bend back) and straighten, essential actions of walking. Unique among hinge joints in the body, the knee also allows a small amount of rotation. The knee is

Achilles Tendon - What is and Definition

The Musculoskeletal System |

What is Achilles Tendon and Definition Achilles Tendon - A thick, strong band of connective tissue at the back of the heel that joins the gastrocnemius and soleus muscles of the calf (back of the lower leg) to the calcaneus (heel BONE). The Achilles TENDON makes possible extension of the foot, a necessary element of walking, running, and jumping. A sharp

Achilles Tendon Injury - pain, rupture, treatment, repair and surgery

The Musculoskeletal System |

What is Achilles Tendon Injury Achilles tendon injury is Traumatic damage to the ACHILLES TENDON, the broad band of connective tissue that joins the calf muscles to the heel of the foot. The most common Achilles TENDON injury is INFLAMMATION, called Achilles TENDONITIS, tends to develop somewhat gradually as an overuse injury. A tear in the Achilles

Achondroplasia - genetic disorder - dwarfism, symptoms and treatment

The Musculoskeletal System |

What is Achondroplasia and Dwarfism Achondroplasia is a genetic disorder in which the rate CARTILAGE cells (chondrocytes) convert to BONE cells is greatly slower than normal, resulting in skeletal abnormalities such as shortened limbs and diminished height. Achondroplasia is the most common cause of SKELETAL DYSPLASIA, commonly called dwarfism. Though

Adhesive Capsulitis shoulder - symptoms, treatment and surgery

The Musculoskeletal System |

What is Adhesive Capsulitis Adhesive Capsulitis shoulder is a condition in which the JOINT capsule of the shoulder joint fuses (adheres) to the head of the humerus (long BONE of the upper arm), causing PAIN and constricting range of motion. Doctors do not know what causes adhesive capsulitis, commonly called frozen shoulder. The condition may be primary,

Athletic Injuries - acute and chronic - information and definition

The Musculoskeletal System |

What are Athletic Injuries ACCIDENTAL INJURIES that occur during athletic activities or sporting events. Though a certain degree of risk is inherent in athletic events, particularly competitions, most athletic injuries occur for three main reasons. They are inadequate CONDITIONING or TRAINING insufficient WARM-UP and pre-event

Arthrogryposis multiplex congenita - definiton, symptoms and treatment

The Musculoskeletal System |

What is Arthrogryposis and Definition The collective term for a group of congenital disorders, also called arthrogryposis multiplex congenita, in which multiple contractures restrict JOINT function throughout the body. Joints may be partially or completely fused. Researchers believe about 30 percent of arthrogryposis develops when the FETUS is not able to

Ankylosing Spondylitis disease - symptoms and treatment

The Musculoskeletal System |

What is Ankylosing Spondylitis A form of chronic, degenerative arthritis (INFLAMMATION of the joints) that primarily affects the spine. The inflammation permanently damages the vertebrae (bones of the spine), causing outgrowths of bony tissue that fuse vertebrae to one another such that their mobility and range of motion can become extremely limited.