Objective To investigate the morphological features of the inferior fascicle of the anterior-inferior tibiofibular ligament (AITFL) and classify the anatomical features, so as to provide reference for the precise anatomy of the tibiofibular joint and the surgical repair of the ankle ligament. Methods 100 adult lower limbs were dissected and the characteristics of the AITFL were noted. The length, origin and insertion widths of the inferior fascicle were measured with a digital vernier caliber, while angles (α) between the inferior fascicle and the horizontal plane were examined with a protractor. Results (1)The AITFL was divided into four types according to the relation between the AITFL and the inferior fascicle: typeⅠ, the inferior fascicle was separated from the rest of the ligament by a gap in 11cases; typeⅡ, the inferior fascicle was not completely separated from the rest of the ligament by a gap, with its origin or insertion attachment continuing with AITFL in 32 cases; type Ⅲ, the inferior fascicle was separated from the rest of the ligament by a gap and possessed its own origin and insertion attachments in 19 cases; type Ⅳ, the inferior fascicle could not be separated from the AITFL in 38 cases. (2) There was no statistical significance in the types between male and female (c2=7.052, P=0.070). The lengths, origin and insertion widths of the inferior fascicle and α were (23.39±5.93) mm, (8.38±4.23) mm, (6.95±4.13) mm and (29.02±10.90), respectively. Conclusions The classification of AITFL in this experiment is a supplement to previous studies. The AITFL is a potential factor causing ankle joint injury. We should pay attention to the variation characteristics of the AITFL when treating the ankle injury by arthroscopy, so as to reduce complications and improve the surgical effect.
Key words
Anterior-inferior tibiofibular ligament /
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Inferior fascicle /
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Variation /
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Applied anatomy
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