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The cross-body block, the major cause of knee injuries.

A detailed study of 259 knee injuries incurred by football players at the University of Michigan and Michigan State University, and by Detroit Lions players points out the various causes of knee injuries occurring on the football field. The study indicts the cross-body block as the major cause of such injuries and describes the blocking method in terms of its place in the game. Although many coaches and officials have been aware of the hazards of the cross-body block, legislative recognition has been given only to its use in "clipping." There is danger of serious visceral injury to the blocker who uses this method. Disability due to knee injury as well as permanent degenerative changes secondary to these injuries make preventive measures desirable. Elimination of the cross-body block could significantly reduce serious knee injuries.