Saddle Joint
Saddle joint (articulation sellaris) (e.g. the carpometacarpal joint of the thumb). This joint is formed by two saddle-shaped articulating surfaces, one “astride” the other moving lengthwise and across the other. As a result this joint allows movement on two mutually perpendicular axes; frontal (flexion and extension) and sagittal (abduction and adduction). Biaxial joints also permit a change of movement from one axis to another, i.e. movement in a circular manner (circumduction).. Since the heads in a condyloid joint are not strictly ellipsoid, the second axis is not necessarily horizontal, Medical Coding Services will analyse all these for the coding process.
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