A new method of overcoming severe equinus deformity in cases of congenital club-foot or of paralytic equinus is presented. This consists of driving a nail or wire through the posterior part of the os calcis, by means of which the os calcis can be firmly grasped. The nail is included in the plaster-of-Paris applied at the time of manipulation. A six weeks' period of immobilization is usually sufficient to correct the most marked degree of equinus.