The medial surface of the lower extremity of tibia is prolonged downward to form a strong pyramidal process, flattened from without inward - the medial malleolus. , The medial surface of this process is convex and subcutaneous; , its lateral or articular surface is smooth and slightly concave, and articulates with the talus; , its anterior border is rough, for the attachment of the anterior fibers of the deltoid ligament...