<prompt> Incudomalleolar joint is a ?Ellipsoid jointPivot jointHinge jointSaddle joint  <response>: Synol joints are classified as follows :1 Plane synol joints flat joints2 Hinge joints Ginglymus joints or ginglymi3 Pivot or trochoid joints4 Condylar bicondylar joints5 Ellipsoid jointsNote : Metacarpophalangeal joints are ellipsoid joints functionally, but structurally they belong to condylar joints.6 Saddle sellar jointsThe aicular surfaces are reciprocally saddle shaped, i.e. concavo-convex. Examples are first thumb carpometacarpal joint, sternoclavicular joint, calcaneocuboid joint, incudomalleolar joint smallest saddle joint and patellofemoral joint.7 Ball and socket spheroidal joints 