Saddle joint
Type of synovial joint with concave, convex surfaces
From Wikipedia, the free encyclopedia
A saddle joint (sellar joint,[1][2] articulation by reciprocal reception[citation needed]) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex. It is found in the thumb, the thorax, the middle ear, and the heel.
| Saddle Joint | |
|---|---|
1: Ball and socket joint; 2: Condyloid joint (Ellipsoid); 3: Saddle joint; 4 Hinge joint; 5: Pivot joint; | |
 Ligaments of wrist. Posterior view. | |
| Details | |
| Identifiers | |
| Latin | articulatio sellaris |
| TA98 | A03.0.00.048 |
| TA2 | 1560 |
| FMA | 75298 |
| Anatomical terminology | |
Structure
Movements
The movements of saddle joints are similar to those of the condyloid joint and include flexion, extension, adduction, abduction, and circumduction.[1] However, axial rotation is not allowed. Saddle joints are said to be biaxial,[5] allowing movement in the sagittal and frontal planes.[2]
Examples of saddle joints in the human body include the carpometacarpal joint of the thumb,[6][7] the sternoclavicular joint of the thorax,[8] the incudomalleolar joint of the middle ear,[9] and the calcaneocuboid joint of the heel.[2]
