The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . tlie thumb,for example, being displaced back-ward, the sharp anterior ridge of the base of the phalanx rests just behindthe terminal enlargement of the extremity of the metacarpal, held firmly inthis position by the tightly strained, lateral ligaments. Extension tends onlyto put these ligaments more violently upon the stretch, unless proper manipu-lations are employed to release the bone. When in a semiflexed position,extension tends only to draw the member more nearly straight, and henceo
The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . tlie thumb,for example, being displaced back-ward, the sharp anterior ridge of the base of the phalanx rests just behindthe terminal enlargement of the extremity of the metacarpal, held firmly inthis position by the tightly strained, lateral ligaments. Extension tends onlyto put these ligaments more violently upon the stretch, unless proper manipu-lations are employed to release the bone. When in a semiflexed position,extension tends only to draw the member more nearly straight, and henceonly increases the resistance, as the phalanx comes more nearly into a linewith the metacarpal bone. But the strong lateral ligaments, acting as afulcrum, increase the pressure of the two bones, which thus become moreand more firmly locked. Hence the dislocation cannot yield to any amountof extension, unless it be applied in a suitable direction. Considerable force must be employed, in whatever direction it be made,and to obtain this, a clove-hitch, Jarviss adjuster, the Indiai) puzzle, and Fig. Forward dislocation of second phalanx of finger.
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