The knee and elbow primarily feature a hinge joint, while the wrist is more complex.
Knee and Elbow: Hinge Joints
According to reference [3][4], the hinge joint is indeed present in the elbow and knee. Hinge joints allow movement primarily in one plane, like the opening and closing of a door.
- Elbow: Allows for flexion and extension of the forearm.
- Knee: Enables flexion and extension of the lower leg.
Wrist: Complex Joint
The wrist is a complex joint consisting of multiple carpal bones that articulate with each other and the radius and ulna bones of the forearm. It is NOT a hinge joint.
Summary Table
| Joint | Primary Joint Type | Movement |
|---|---|---|
| Knee | Hinge | Flexion, Extension |
| Elbow | Hinge | Flexion, Extension |
| Wrist | Condyloid/Ellipsoid | Flexion, Extension, Abduction, Adduction, Circumduction |
