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Boyes' Test - Flexor Digitorum Superficialis Finger Examination Evaluate the injured finger for flexion. Inability to flex the isolated finger at the metacarpophalangeal joint may indicate a partial or complete tear of the flexor digitorum superficialis. Video via @open_michigan #Boyes #Test #finger #hand #PhysicalExam #clinical #video #sports #msk #orthopedics #flexor #digitorum #superficialis