Evaluation of the Kidner procedure in treatment of symptomatic accessory tarsal scaphoid.

The Kidner operation is a successful method of treatment for symptomatic feet with Type II and Type III accessory tarsal scaphoids that do not respond to conservative methods of treatment. The success of this operation is related more to the elimination of the bony prominence on the medial aspect of the foot and its mechanical irritation than to the correction of the pronated foot by means of posterior tibial tendon transfer. The age of occurrence of symptoms can be correlated with the level of physical activity and ossification or growth of this accessory bone. Symptoms in older patients develop after injury. The pronated foot or mechanically insufficient foot increases the stress on the bony prominence of the accessory tarsal scaphoid bone and precipitates in symptoms.