A hinge joint is a type of joint in the body that allows movement primarily in one plane, much like a door hinge.
Understanding Hinge Joints
According to reference material, a hinge joint (also known as ginglymus or ginglymoid) is characterized by articular surfaces molded to each other, restricting motion to a single plane. This classifies them as uniaxial joints, possessing one degree of freedom.
Key Features of Hinge Joints:
- Movement: Primarily allows flexion and extension.
- Structure: Features interlocking surfaces of bones, guiding movement along a single axis.
- Uniaxial: Only allows movement in one plane (one degree of freedom).
Examples of Hinge Joints:
| Joint | Location | Primary Movements |
|---|---|---|
| Elbow | Between upper arm (humerus) and forearm (radius and ulna) | Flexion and extension |
| Knee | Between thigh (femur) and lower leg (tibia and fibula) | Flexion and extension |
| Ankle | Between lower leg (tibia and fibula) and foot (talus) | Plantarflexion (pointing toes) and dorsiflexion (lifting toes) |
| Interphalangeal joints | Fingers and toes | Flexion and extension |
Functionality:
Hinge joints are critical for everyday activities that require bending and straightening, such as walking, grasping objects, and kicking.
