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Forward dislocation of the carpal semilunar is a fairly common condition usually caused by an injury involving violent overextension of the hand. Backward dislocation, as shown in the accompanying illustration, is not frequent.
The patient fell from a height, June 10, 1924, and as he alighted he flung out his right arm violently to save himself. He is quite positive that the injury did not take place by reason of contact of the hand with the ground. An effort was made within a few minutes after the accident to reduce the apparent displacement, and it was thought that reduction had been effected. Six weeks later, the hand was still disabled; there was slight swelling, bluish discoloration, and a bony prominence over the back of the wrist; flexion of the hand on the arm was possible, but extension was possible only by passive movement; there was considerable pain. The condition disclosed
Robinson WH. BACKWARD DISLOCATION OF THE CARPAL SEMILUNAR (OS LUNATUM). JAMA. 1925;84(18):1335. doi:10.1001/jama.1925.26620440003007b
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