I. It appears that we are dealing with a separate disease entity which can be differentiated from "weak foot."
II. The pain and tenderness may be due to:
a. Irritation of the joint between the scaphoid and accessory scaphoid.
b. Irritation of the tendon of tibialis posticus.
c. Inflammation of the bursa between the tibialis posticus tendon and the accessory scaphoid.
III. As to treatment, conservative means should be tried out. In stubborn cases, removal of accessory scaphoid is indicated and relief of tenderness and pain can be expected.
IV. I would suggest for this disorder the name: "Disturbance of Accessory Scaphoid Bone."