title: Symptomatic os infranaviculare.
abstract: The author observed a new accessory bone of the foot in the distal portion of navicular, which articulated with the medial cuneiform and the intermediate cuneiform, and named it os infranaviculare. A degenerative change was observed between the accessory bone and the navicular; this caused midfoot pain to the patient during weight-bearing. Thus, the patient was treated by excision of the accessory bone. The symptom was relieved at one-year postoperative.
authors.affiliation: Department of Orthopedic Surgery, Ewha Womans University School of Medicine, Seoul, Korea. 　kimjk@ewha.ac.kr
authors.forename: Jae Kwang
authors.initials: JK
authors.lastname: Kim
authors.forename: Kwon Jae
authors.initials: KJ
authors.lastname: Roh
mesh_terms: D001847:Bone Diseases / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000209:etiology; D011859:Radiography; D012420:Running; D013639:Tarsal Bones / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery
keywords: Accessory bone; Os infranaviculae