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IJCRR. 2012; 4(22): 105-108


THE ACCESSORY NAVICULAR BONE A RADIOLOGICAL FINDING AND DISCUSSION OF ITS CLINICAL PRESENTATION

S.D. Desai, Sahana B. N., Monish Bami.

Abstract
Introduction- The accessory navicular is located on the posteromedial aspect of the foot, in close proximity with the navicular bone. This radiographic variant has been described in the anatomic and orthopaedic literatures with a variation of names such as ostibiale externum, osnaviculare secundarium, osnaviculare accessorium, osscaphoidea accessoria and pre-hallux. We report here two cases to better the understanding of this condition.
Case Report- Two X-rays with asymptomatic accessory navicular bones were obtained from the department of orthopaedics. Case 1: A 43 year old male patient came to orthopaedic OPD with fracture of lower one third of left tibia, both leg and foot was radiographed for the same. Case 2: A 27 year old female patient came with left ankle sprain for which X- ray of foot along with ankle joint was taken.
Conclusion- Though asymptomatic, they were at risk of developing symptoms related to accessory navicular later in life. Therefore the findings are to be considered by radiologists, orthopaedicians and physicians before treating a patient with complaints of pain at ankle joint or foot and a high degree of clinical suspicion must be kept in mind in patients with persistant pain.

Key words: Accessory navicular, ostibiale externum, prehallux, X ray.



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