Ossification in lateral submalleolar area or in between lateral malleous and talus has been reported to be a normal variant - os subfibulare. The etiology of these ossifications/calcifications is unclear (unfused epiphyseal ossification center, supernumerary ossicles or traumatic origin).
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Sag STIR
33 yo with ankle pain
Ossification in lateral submalleolar area or in between lateral malleous and talus has been reported to be a normal variant - os subfibulare. The etiology of these ossifications/calcifications is unclear (unfused epiphyseal ossification center, supernumerary ossicles or traumatic origin). Perimalleolar ossifications can be found in three locations. Below the malleolar tip on medial side termed as os subtibiale, on the lateral side as os subfibulare, and along the lateral border of the lateral malleolus referred as os retinaculi. In general it is almost impossible to distinguish normal developmental finding from sequelas of trauma particularly during the later stages of ossification and in adults (ossification become around).
Suggested Reading:
EE Berg. Associated with recurrent instability of the ankle. The symptomatic os subfibulare. Avulsion fracture of the fibula. 1991;73:1251-1254. J Bone Joint Surg Am.
TH Bowlus, SF Korman, M Desilvio, and R Climo. Accessory os fibulare avulsion secondary to the inversion ankle injury. J Am Podiatr Med Assoc, Vol. 70, Issue 6, 302-303, June 1, 1980.
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