There is a high tensile stress at the segment inside the condyle under an impact to the face or chin because of the anatomical characteristics of the mandibular condyle. SFMC occurs often at the medial process of mandibular condyle.

• 由于髁状突的解剖特点 ,当正中颌面部或颏部受撞击时 ,其髁头内极具有较高的张应力和较弱的承受力而导致SFMC。