Sattelgelenks

Sattelgelenks, also known as saddle joints, are a type of synovial joint found in the human body. They are characterized by a reciprocal, saddle-shaped articulation between two bones. This unique shape allows for a wide range of motion, but limits rotation. Each bone surface has a convex and a concave portion, fitting together like a rider on a saddle. This anatomical configuration provides stability while permitting movement in two planes: flexion-extension and adduction-abduction.

The most prominent example of a saddle joint in the human body is the carpometacarpal joint of the thumb. This joint is crucial for the opposability of the thumb, enabling us to grasp and manipulate objects. The sternoclavicular joint, connecting the sternum to the clavicle, also exhibits characteristics of a saddle joint, facilitating shoulder movement. While these are the primary locations, other joints may show some saddle-like features. The movement at saddle joints is gliding and occurs along two perpendicular axes. They are enclosed within a joint capsule filled with synovial fluid, which lubricates the joint and reduces friction.