Accessory navicular syndrome occurs when a type II accessory navicular becomes painful due to movement across the pseudo-joint between the ossicle and the navicular bone.
It can be inferred on musculoskeletal ultrasound if a patient's pain is located at a type II accessory navicular and the patient is tender to transducer pressure. Ultrasound can also be useful to compare with the contralateral side.
The syndrome presents on MRI with bone marrow edema signal i.e.
- T1: hypointense
- T2/STIR: hyperintense
This can involve both the accessory ossicle and navicular.
- 1. Bernaerts A, Vanhoenacker FM, Van de Perre S et-al. Accessory navicular bone: not such a normal variant. JBR-BTR. 2005;87 (5): 250-2. Pubmed citation
- 2. Mosel LD, Kat E, Voyvodic F. Imaging of the symptomatic type II accessory navicular bone. Australas Radiol. 2004;48 (2): 267-71. doi:10.1111/j.1440-1673.2004.01286.x - Pubmed citation
- 3. T T Miller, R B Staron, F Feldman, M Parisien, W J Glucksman, L H Gandolfo. The symptomatic accessory tarsal navicular bone: assessment with MR imaging. (1995) Radiology. doi:10.1148/radiology.195.3.7754020
- 4. Choi YS, Lee KT, Kang HS, Kim EK. MR imaging findings of painful type II accessory navicular bone: correlation with surgical and pathologic studies. (2004) Korean journal of radiology. 5 (4): 274-9. doi:10.3348/kjr.2004.5.4.274 - Pubmed