Fig. 4
From: Anatomical study of the proximal tibiofibular ligaments using ultrasound
Superior bundle of the anterior PTF ligament (transverse plane). a The superior bundle (AS) is well differentiated from the more superficial anterior arm of the biceps femoris muscle (BF). It extends from the anterior aspect of the styloid process and the adjacent fibular head (F) to the lateral aspect of the tibia (T). Note the hyperechoic space between them (arrows). b Close proximity between the superior bundle (AS) and the anterior arm (BF) but their different anisotropy allows their differentiation. c Close proximity between the superior bundle (AS) and the anterior arm (BF) but no clear differentiation between them due to similar anisotropy. LCL: lateral collateral ligament; FL: fibularis longus muscle; EDL: extensor digitorum longus muscle