1. A study is presented of 286 extra-articular subtalar arthrodeses done during the years 1958 to 1965 on 258 patients with pes calcaneo-valgus, pes planovalgus, pes varus or flail foot.

2. Certain changes in the surgical technique originally presented by Grice have been made. We have applied the arthrodesis not only to valgus feet but also to varus feet, and we have described the details of the surgical technique as used on the varus foot.

3. In none of our cases was there failure of fusion or reabsorption of the graft. The unsatisfactory results (239 per cent) were caused by residual varus or valgus deformity of the foot.