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Background: We evaluated the relationship between the type of accessory navicular bone (ANB) and radiographic parameters of the foot in patients with bilateral ANBs of different types.
Methods: Patients with bilateral ANBs of different types participated in this study between May 2019 and April 2020. Patient data, including age, sex, body mass index (BMI), and presence of symptoms, were obtained. We aimed to compare the radiographic parameters of both feet to evaluate the differences from one another in patients with bilateral ANBs of different types (one side type 1 and one side type 2) because the foot angles may differ in each person. Seven radiographic parameters evaluating hindfoot, midfoot, and forefoot alignment were measured: calcaneal pitch angle, talocalcaneal angle, tibiocalcaneal angle, naviculocuboid overlap, talonavicular coverage angle, and anteroposterior and lateral talo–first metatarsal angles.
Results: Twenty patients (13 women and seven men) with a mean ± SD age of 38.5 ± 12.3 years were included in the study. The patients had a mean ± SD height of 168.1 ± 7.1 cm, weight of 77.2 ± 10.5 kg, and BMI of 27.4 ± 4.3. There were no significant differences between type 1 and type 2 ANBs in any radiographic parameters and no significant correlations between radiographic parameters and age, BMI, or the presence of symptoms.
Conclusions: We found that the type of ANB had no effect on the radiographic measurements of the foot in patients with bilateral ANBs of different types. Age, BMI, and the presence of symptoms also demonstrated no correlations with the radiographic parameters.