Long plantar ligament

The long plantar ligament is the longest of all the ligaments of the tarsus: it is attached behind to the plantar surface of the calcaneus in front of the tuberosity, and extend in front to the tuberosity on the plantar surface of the cuboid bone for its deepes fibers, the more superficial fibers being continued forward to the bases of the second, third, and fourth metatarsal bones. This ligament converts the groove on the plantar surface of the cuboid into a canal for the tendon of the fibularis longus.

The long plantar ligament is a broad, flat, and strong band, with considerable variation in its shape, number of bands, and attachments among individuals. It is the most superficial of the plantar calcaneocuboid ligaments and is distinguishable from the deeper short plantar (plantar calcaneocuboid) ligament.

The long plantar ligament plays a crucial role in maintaining the stability of both the longitudinal and transverse arches of the foot, and its integrity is essential for normal foot biomechanics.