1. Supernumerary bones about the ankle are of frequent occurrence.
2. Their existence is of considerable medico-legal importance, as they have been mistaken for fractures.
3. The particular importance attaching to the presence of the accessory tarsal scaphoid lies, not in the presence of this accessory bone per se, but in the fact that it indicates an abnormal insertion of the tibialis posticus tendon, which produces a "weak foot",—the tendon being entirely or mainly inserted into the scaphoid.
4. No special sensitiveness on pressure is associated with the accessory tarsal scaphoid. [SEE FIGURE IN SOURCE PDF]
5. Some of these patients come for examination because of the prominence in the position of the scaphoid without additional symptoms.
6. This condition probably accounts for many of the failures in treating weak feet according to conventional methods.
7. Removal of the accessory scaphoid bone and the prominent portion of the scaphoid is indicated in many cases.
8. Astragaloscaphoid arthrodesis is deserving of another trial with better technique.