The deep crural arch, also known as the medial longitudinal arch, refers to the prominent arch formation on the inner side of the human foot. It is one of the three arches that comprise the overall structure of the foot, along with the lateral longitudinal arch and the transverse arch. The deep crural arch extends from the heel to the ball of the foot and is formed by the alignment of several bones, muscles, tendons, and ligaments.
The arch is primarily supported by the tibialis posterior muscle, which runs along the back of the lower leg and attaches to the bones of the foot. This muscle plays a vital role in maintaining the arch's integrity and preventing excessive flattening of the foot during weight-bearing activities.
The deep crural arch functions as a shock absorber and distributes the forces exerted on the foot during walking, running, or jumping. It helps to lessen the impact on the bones and joints, providing stability and cushioning. A well-developed arch contributes to proper weight distribution, balance, and overall foot function.
However, an insufficiently developed or collapsed arch can lead to a condition known as flat feet or fallen arches. This can result in foot and ankle problems, such as pain, instability, and an increased risk of injury. Arch supports, orthotics, and specific exercises are commonly used to treat or prevent issues related to the deep crural arch.
