. A practical treatise on fractures and dislocations. tacarpal bone intothe palm of the hand. The long flexor and the extensors are relaxedby inclination of the hand toward the radial side. Consequently, torelax as much as possible the various muscles attached to the thumb,the hand should be held in straight extension and slight abduction,and the thumb should be pressed into the palm, Farabeuf: Bull, de la Societe de Chirurgie, 1876, p. DISLOCATIONS OF THE THUMB AND FINGERS. 705 The dislocation m;iy be backward, forward, or to the inner side ;complete or incomplete. Backward
. A practical treatise on fractures and dislocations. tacarpal bone intothe palm of the hand. The long flexor and the extensors are relaxedby inclination of the hand toward the radial side. Consequently, torelax as much as possible the various muscles attached to the thumb,the hand should be held in straight extension and slight abduction,and the thumb should be pressed into the palm, Farabeuf: Bull, de la Societe de Chirurgie, 1876, p. DISLOCATIONS OF THE THUMB AND FINGERS. 705 The dislocation m;iy be backward, forward, or to the inner side ;complete or incomplete. Backward Dislocations. This is the most frequent form, and the one in which reduction ofthe dislocation is often difficult. The common cause is exaggerated dorsal flexion of the first the normal limit of the movement is reached the anterior lini-ment is put upon the stretch and, the movement being eon tinned, yieldsat its attachment to the metacarpal bone, so that the anterior ligamentaccompanies the phalanx in its movement. Fig. 320. Fig. Incomplete dislocation of the thumb. Incomplete dislocation. (Faeabeuf.) a. Incomplete Form. If this movement is not carried further thanto the position shown in Fig. 320 the articular end of the phalanx restsagainst the posterior margin of the head of the metacarpal bone, andis maintained in this position by the tension of the portions of theadductor and abductor muscles which are attached directly to thephalanx, for their line of traction is now posterior to and above thenew centre of motion. The attitude of the member is represented inFig. 321. This incomplete form is the one which many people, especially theyoung, can voluntarily produce by contracting the extensor anterior ligament and the sesamoid bones rest like an apronagainst the anteroinferior articular surface of the metacarpal bone,and the dislocation can be readily reduced by moderate traction uponthe phalanx and flexion. b. Complete Form. If, however, the
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