Sellar joint

The sellar Joint is composed of two bones whose articirlar surfaces are saddle-shaped, with one surface convex and one concave. This allows for greater motion in all planes. An example of this is the trapezium-metacarpal (thumb) artic-rrlation. 

The femoropatellar joint is a sellar joint the articulating surface of the patella is adapted to the patellar surface of the femur. This femoral articulation involves the anterior surface of both condyles. An oblique groove divides it into a large lateral and smaller medial area. The quadriceps muscles, the quadriceps tendon, and the patellar tendon maintain the joint s stability. Its major motions are vertical up-and-down movement on the femur, and movement in a sagittal plane with respect to the tibia. This allows a pulley function during flexion and extension of the knee. 

The structure of the articular sitrfaces further classify joints into plane, spheroid, concfylar, ellipsoid, trochoid, sellar, wAginglymusioiris. 

The sternoclavicular joint has a sellar or saddle-shaped articular surface, frequently with an interposed meniscus. This joint affords three planes of movement of the clavicle, in a frontaf and horizontal plane, as well as rotation on its long axis. 

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See also in sourсe #XX -- [ ]

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