“…They may also simulate fractures and restrict range of motion. 3,12,[18][19][20][21] The reported prevalence of accessory ossicles in the foot and ankle in the general population is 18% to 36.6%. 3,9 The accessory navicular bone, also called the os tibiale, os tibiale externum, or naviculare secundarium, is adjacent to the posteromedial tuberosity of the navicular bone.…”