Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In a saddle joint (sellar joint, articulation by reciprocal reception) the opposing surfaces are reciprocally concave-convex.The movements are a the same as in a condyloid joint; that is to say, flexion, extension, adduction, abduction, and circumduction are allowed; but no axial rotation. Saddle joints are said to be biaxial, allowing movement in the sagittal and frontal planes. In a condyloid joint (condyloid articulation, ellipsoidal joint) an ovoid articular surface, or condyle, is received into an elliptical cavity. This permits movement in two planes, allowing flexion, extension, adduction, abduction, and circumduction.