Osteopathic curricula typically reduce joint motion to a canonical set: Extension, Flexion, Abduction, Adduction, Rotation, Planar Flexion, Dorsiflexion, Inversion, and Eversion. Most of these pair as opposites across cardinal planes — flexion/extension along the sagittal, abduction/adduction along the coronal, and inversion/eversion restricted to the foot. Treating them as a fixed vocabulary makes clinical communication and charting tractable.
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