Fractures of the proximal tibial epiphysis are rare. A series of twenty-eight fractures classified according to the Salter-Harris method showed that nine were Type II and eight, Type IV. Lawn-mower injuries, a previously unreported mode of injury for this fracture, caused five of the eight Type-IV fractures and were associated with the worst prognosis by far. Two Type-V fractures in the proximal tibial epiphysis, previously unreported, are described.