The Fibular Incisure of the Tibia on CT Scan: A Cadaver Study

Abstract

Twenty cadaver lower limbs were used for CT assessment of the fibular incisure of the tibia. The length of the syndesmotic facet is shorter in the anterior (11.20 ± 1.90 mm) than in the posterior (14.89 ± 2.72 mm) ( P < 0.001). The angle between anterior and posterior facets is 135.18 ± 9.27°. The depth of the fibular incisure of the tibia is 4.29 ± 1.26 mm. The vertical distance of tibiofibular overlapping is 7.81 ± 1.93 mm. The distance between anterior margin of the tibia and anterior margin of the fibula is 17.40 ± 3.61 mm. The distance between the medial fibular border and the lateral border of the posterior tibia is 2.01 ± 0.49 mm. The syndesmotic notch could be divided into two groups: significant concave surface and shallow concave surface. The position of the fibula in the incisural notch may depend on the depth of the fibular incisure of the tibia during traumatic forces applied on the syndesmosis. CT can display the tibial tubercles and clearly demonstrates the fibular incisure of the tibia and the interior of the tibiofibular space.