Swan Neck and Boutonniere/Pseudo-Boutonniere Deformities

Swan Neck and Boutonniere/Pseudo-Boutonniere Deformities: From a definition point of view, any primary pathology that causes excessive tension on the extensor apparatus leading the PIP joint in hyperextension will produce a symptom called a Swan Neck Deformity. Whereas a true Boutonniere Deformity is primarily caused by the central slip rupture. Otherwise any primary pathology that causes excessive tension on the flexor apparatus leading to PIP joint flexion will produce a symptom called as Pseudo-Boutonniere deformities.

The Hand; Tubiana, Vol III: The Swan Neck Deformity & The BoutonniereDeformity

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