Fig. 3

Classification of the short plantar ligament. Type I-a: the SPL is a superficial (single) fiber bundle. Type I-b: the SPL is a superficial fiber bundle and a deep fiber bundle. Type II: the SPL is a superficial fiber bundle (medial and lateral) and a deep fiber bundle. 1: calcaneus, 2: long plantar ligament, 3: the superficial fiber bundle of the short plantar ligament, 4: the deep fiber bundle of the short plantar ligament, 5: superficial fiber bundle (lateral) of the short plantar ligament, 6: superficial fiber bundle (medial) of the short plantar ligament, 7: cuboid, L: lateral, M: medial, Red area: the footprint of the long plantar ligament at the calcaneus and cuboid. Blue area: the footprint of the superficial fiber bundle of the short plantar ligament at the calcaneus and cuboid. Yellow area: the footprint of the deep fiber bundle of the short plantar ligament at the calcaneus and cuboid