A hammer toe is a deformity of the second, third or fourth toe in which the toe becomes bent at the middle joint; hence, it resembles a hammer. Claw toe and mallet toe are related conditions. While a hammer toe is contracted at the first toe joint, a mallet toe is contracted at the second toe joint, and a claw toe is contracted at both joints.
According to the 2012 National Foot Health Assessment conducted by the NPD Group for the Institute for Preventive Foot Health, 3 percent of U.S. adults age 21 and older (about 7 million people) have experienced hammer toe or claw toe. The condition is significantly more prevalent in females than in males.