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    Related Topics

    From Musculoskeletal System

    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Vertebral Column
    Spinal column consisting of vertebrae.
    Hamstrings
    Biceps Femoris, Semitendinosus, Semimembranosus.
    Brachioradialis
    Muscle responsible for forearm flexion.
    Patella
    Knee cap, protecting the knee joint.
    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Mandible
    Lower jawbone that houses the teeth.
    Humerus
    Upper arm bone connecting the shoulder to the elbow.
    Thoracic Cage
    Ribs and sternum forming the protective cage for the heart and lungs.
    Sternum
    Breastbone located in the center of the chest.
    Ulna
    Forearm bone on the pinky side.
    Pubis
    Part of the pelvis that joins with the opposite side to form the pubic symphysis.
    Sacrum
    Triangular bone at the base of the spine.
    Ischium
    Part of the pelvis that supports weight while sitting.
    Gluteus Maximus
    Largest muscle in the buttocks responsible for hip extension.
    Palatine Bones
    Bones forming part of the hard palate and nasal cavity.
    Vomer Bone
    Bone forming the nasal septum.
    Radius
    Forearm bone on the thumb side.
    Lumbar Vertebrae (L1 - L5)
    Vertebrae in the lower back (L1-L5).
    Frontal Bone
    Bone forming the forehead and upper part of the orbits.
    Thoracic Vertebrae (T1 - T12)
    Vertebrae in the upper and mid-back (T1-T12).
    Gomphoses
    Fibrous joints where a peg fits into a socket (e.g., teeth in jaw).
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Diaphragm
    Primary muscle for breathing.

    Hinge Joints

    Reviewed by our medical team

    e.g., elbow, knee

    1. Overview

    A hinge joint is a type of synovial joint that allows movement in one plane, similar to the motion of a door hinge. These joints are designed primarily for flexion and extension, enabling bending and straightening motions. Hinge joints are crucial in everyday movements and are known for their strength and stability, particularly in the limbs where weight-bearing and repetitive motion are frequent.

    2. Location

    Hinge joints are found in multiple areas of the body, especially in the upper and lower limbs:

    • Elbow joint: Between the humerus and ulna (humeroulnar joint).

    • Knee joint: Primarily functions as a modified hinge joint between the femur and tibia.

    • Interphalangeal joints: Between the phalanges of fingers and toes (both proximal and distal).

    • Ankle joint: The talocrural joint allows hinge-like plantarflexion and dorsiflexion.

    • Temporomandibular joint (partially): While it allows other movements, the hinge mechanism contributes to jaw opening and closing.

    3. Structure

    Hinge joints are structured to allow uniaxial motion while maintaining stability:

    • Articulating surfaces: One bone has a convex (rounded) surface that fits into a concave surface of another bone.

    • Joint capsule: A fibrous capsule encloses the joint and maintains alignment of articulating surfaces.

    • Synovial membrane: Lines the capsule and secretes synovial fluid for lubrication and nourishment.

    • Ligaments: Reinforce the capsule and limit motion to one plane; e.g., ulnar collateral ligament at the elbow, medial and lateral collateral ligaments at the knee.

    • Articular cartilage: Covers the bone surfaces to minimize friction and absorb shock.

    4. Function

    Hinge joints primarily enable uniaxial movement:

    • Flexion: Bending the joint, decreasing the angle between bones (e.g., bending the elbow).

    • Extension: Straightening the joint, increasing the angle between bones (e.g., straightening the knee).

    These joints do not permit rotation or side-to-side movement, which adds to their mechanical stability.

    5. Physiological role(s)

    Hinge joints support essential physiological functions:

    • Locomotion: Knee and ankle hinge joints play a central role in walking, running, and jumping.

    • Manipulation: Elbow and finger joints allow gripping, lifting, and tool use.

    • Load transfer: Designed to absorb and distribute compressive and tensile forces during weight-bearing or movement.

    • Precision movement: Finger hinge joints contribute to fine motor control in tasks like writing or buttoning a shirt.

    6. Clinical Significance

    Hinge joints are commonly involved in orthopedic and rheumatologic conditions:

    • Osteoarthritis:

      • Degeneration of articular cartilage in hinge joints (especially knees and fingers) can lead to pain, stiffness, and reduced motion.

    • Ligament injuries:

      • Collateral ligament sprains or tears can destabilize hinge joints (e.g., medial collateral ligament injury in the knee).

    • Fractures near hinge joints:

      • Fractures of bones forming hinge joints (e.g., distal humerus or proximal ulna) can impair joint function and require surgical repair.

    • Inflammatory arthritis:

      • Conditions like rheumatoid arthritis frequently affect small hinge joints in the hands and feet.

    • Joint contractures:

      • Prolonged immobilization or neurological injury can lead to stiffness or permanent loss of motion in hinge joints.

    • Joint replacement:

      • In severe cases, especially at the knee or elbow, joint prostheses can be used to restore hinge function.

    Did you know? The human body has over 600 muscles.