It is proposed that rheumatoid deformity of the central three metacarpophalangeal joints is caused primarily by the flexor tendons acting on diseased joint restraints. During pinch and grasp the tendons bend volarly and ulnarly at the tunnel mouth; the resultant pulley forces damage the supporting collateral ligaments, especially on the radial side. The flexor tendons and proximal phalanges can then displace volarly and ulnarly, and the fingers deviate ulnarly. I n the fifth digit, ulnar deviation apparently results from the incompletely opposed pull of the abductor digiti quinti.Es postulate que deformitate rheumatoidee del tres central articulationes metacarpophalangee es causate primarimente per le tendines flexori in lor action contra le resistentia de morbide articulationes. In le activitate del pincear e del saisir, le tendines se flecte in direction volar e ulnar a1 bucca del tunnel. Le resultante fortias compromitte le supportante ligamentos collateral, specialmente a1 latere del radio. Alora le tendines flexori e le phalanges proximal pote displaciar se in direction volar e ulnar, e le digitos sufire un deviation in direction ulnar. In le quinte digito, deviation in direction ulnar resulta apparentemente ab le incompletemente opponite traction del quinte abductor digital.

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