Corpus: Plantar aponeurosis

The plantar aponeurosis is a strong aponeurosis located on the sole of the foot. It is situated between the muscles of the foot and the skin.

The plantar aponeurosis originates from the calcaneus and spreads out in a V-shape into the joint capsules of the metatarsophalangeal joints and the end tendons of the toe flexors.

The plantar aponeurosis plays a crucial role in stabilizing the longitudinal arch of the foot. Due to its greater distance from the foot skeleton compared to tendons and ligaments that run directly between individual foot bones, it provides a better lever arm for tensioning the arch. This structure is also tightly connected to the skin of the sole via dense fiber bundles, which prevents the skin from moving and ensures a secure stance. Additionally, the fatty tissue between these fibers acts as a pressure cushion.

A so-called heel spur can develop in the attachment area of the plantar aponeurosis due to overuse and the body's repair mechanisms (calcium deposits). Heel spurs can also develop in the area of the Achilles tendon.

Fibromatosis of the plantar aponeurosis is known as Ledderhose disease.