—K., man, aged 24, athletic and muscular, referred by Dr. E. L. Harney, stepped from an express wagon down on an ice cream freezer, Sept. 15, 1915. The cracked ice on which he stepped with his right foot gave way, causing outward rotation. With the leg in abduction and the knee semiflexed, he fell to the ground. From his description of the fall it is quite impossible to determine the precise nature of the wrench which his knee received. He arose without difficulty, walked as usual for about two blocks, when his knee suddenly became locked, and he fell helpless. The examining physician found the knee partially flexed and fixed. Only slight motion in either direction could be borne. All maneuvers to cause complete extension were fruitless. A fixation splint was applied pending Roentgen examination.
—The roentgenograms revealed a fragment of bone free in the joint cavity. This
Kahle RR. KNEE BLOCK FROM AVULSION OF BONE FRAGMENT BY POSTERIOR CRUCIAL LIGAMENT. JAMA. 1916;LXVII(1):33–34. doi:10.1001/jama.1916.02590010037011
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