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Immobilization of the thumb is frequently necessary in the treatment of sprains of its joints or fractures of its phalanges or metacarpals. A certain amount of abduction is often advisable, particularly in those rather common fractures of the metacarpal due to boxing. The ordinary splint made of a single tongue depressor or similar material, applied to the dorsal or palmar aspect of the thumb, does not fit well, is uncomfortable, is difficult to maintain in position, and provides only a relative degree of immobilization. A plaster cast provides all the requirements of the treatment but takes time to put on, cannot be removed and reapplied at subsequent dressings, and is bulky and uncomfortable for the patient. In some cases it will always be needed, but the great majority of cases can be treated with satisfaction to both surgeon and patient by the coaptation splint here described. It is easy
Lester CW. A COAPTATION SPLINT FOR IMMOBILIZATION OF THE THUMB IN ABDUCTION. JAMA. 1928;91(2):96-97. doi:10.1001/jama.1928.92700020001010a