Glossary Condition
Quadriga effect
Also known as quadriga syndrome quadriga phenomenon
Loss of flexion in the neighbouring fingers when one flexor digitorum profundus tendon is shortened or tethered, because the profundus tendons of the middle, ring and little fingers share a muscle belly: the shortened tendon reaches its excursion limit first and the others cannot complete their flexion. Described by Verdan in 1960 and named after the Roman four-horse chariot; a cadaver model shows a measurable effect from 10 mm of shortening.