The malleolus is the protuberance of bone on either side of the ankle.

Medial (MM) and lateral (LM) malleoli.


Medial or lateral?

The maleolus on the inner side is the medial malleolus (and is part of the tibia bone) and the one on the outer side is the lateral malleolus (and is part of the fibula bone).

ankle bone

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Bilateral medial malleolus stress fractures due to osteoarthritis of knee: A case report and review of literature. Soni A, Vollans S, Haendlmayer K and Ng A. Int J Surg Case Rep. 2015; 6: 266–268.

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