All-Inside Endoscopic Kidner Procedure for Symptomatic Accessory Navicular

The accessory navicular (AN) is a common accessory ossicle of the foot. Once patients with ANs become symptomatic, they mostly complain of tenderness over the prominence, which occurs recurrently after a twisting sprain. The Kidner procedure is successful in alleviating symptoms. The excision of the AN is accompanied by rerouting of the posterior tibial tendon to the side of the medial aspect of the navicular. The purpose of this technical note is to report an all-inside endoscopic approach to achieve the Kinder procedure. As an endoscopic approach, the procedure has the advantages of better cosmetic results and less soft-tissue irritation; in addition, the broad ligamentous continuity is protected, the bony prominence is minimized, and sagging of the talonavicular joint is counteracted.