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The effect of this quadriga phenomenon is important in several clinical situations, including testing for strength, assessing movement of the tendons, and when deciding which exercises to teach the patient after a tendon injury.he quadriga syndrome is a condition in which the flexor. tendon excursion is reduced in an unaffected finger. when the excursion of the flexor digitorum profundus. (FDP) tendon of the adjacent finger is altered by stiff-. ness, injury, or adhesion (Verdan, 1960).
In addition, Verdan observed that patients with quadriga also complained of a lack of prehensile power. Quadriga occurs because the ulnar three fingers are flexed by a single ulnar belly of the FDP muscle, whose origin is on the flexor aspect of the ulna and the interosseous membrane.uadriga was first described by Bunnell (1924) , who observed âAs the flexor tendons arise from practically a common muscle belly, the function of one tendon limits the excursion of the rest of the tendonsâ.