STEP 1: YOUR FEET - UNDERSTANDING ANATOMY BASICS
The foot, like a beautifully and ingeniously designed building, is both complex and functional. It is the most elaborate structure in the human body and is made up of 28 bones, 33 joints, 107 ligaments, 31 tendons, and miles of nerves and blood vessels. Half of all the bones in your body are in the feet.
Even the skin covering the feet is highly specialized. If you think of the skin of the body as fine silk, then the skin on the feet would be Goretex - four times as thick. When treated with care, this complicated network of components will never let you down, but like a building that falls into disrepair, neglect will take its toll on your feet.
THE FOOT'S FUNCTIONS
The foot has two main functions: to support the body's weight and to seamlessly transfer that weight onto a variety of surfaces with each step. It must be at once a loose bag of bones to adapt to varied surfaces and a study platform that is capable of propelling your body weight forward. This is the yin and the yang of the foot - its two seemingly opposite natures that are both necessary in order for it to work properly. The foot's twig like bones interlock like jigsaw puzzles pieces, which lock and unlock according to the foot's activity. This is called pronation, when the foot is unlocked and flexible; and supination, when it is locked and rigid. The foot's ability to recognize and adapt to different surfaces is what keeps us from wobbling like penguins.
DETERMINING YOUR FOOT TYPE
FOOT STRUCTURE
The foot is composed of three sections - the forefoot (the toes), midfoot (the arch), and hindfoot (the heel).
1. THE FOREFOOT
The forefoot includes the five metatarsal bones, and the phalanges (the toes). The first metatarsal bone bears the most weight and plays the most important role in propulsion. The shortest and thickest, it also provides attachment for several tendons. The second, third, an fourth metatarsal bones are the most stable of the metatarsals. They are well protected and have only minor tendon attachments. Near the head of the first metatarsal, on the plantar surface of the foot, are two sesamoid bones (a small, oval-shaped bone that develops inside a tendon where the tendon passes over a bony prominence). They are held in place by their tendons, and are also supported by ligaments.
2. THE MIDFOOT
The midfoot includes five of the seven tarsal bones (the navicular, the cuboid, and the three cuneiform). The distal row contains the three cunieforms and the cuboid. The midfoot meets the forefoot at the five tarsometatarsal joints. There are multiple joints within the midfoot. The three cuneiforms articulate with the navicular bone.
3. THE HINDFOOT
The talus and the calcaneus make up the hindfoot. The calcaneus is the largest tarsal bone, and forms the heel. The talus rests on top of it, and forms the pivotal, lower half of the ankle joint.
The two most common shapes of the human foot are the plano-valgus, or flat foot, and the cavus, or high-arched foot.
THE FLAT FOOT
The flat foot easily adapts to various ground surfaces, yet has a difficult time transferring weight from one foot to the other during a normal walking gait. The flat foot is in the pronated (flexible) phase through all phases of the walking gait cycle - from the moment the heel strikes the ground to the final push from the toes that leads to the next step. This lack of rigidity overworks muscles and tendons in the foot and leg, which become worn out in the attempt to make the foot more rigid.
The demands placed on these muscles are often expressed as arch and leg fatigue after walking, running, or even standing in place for long periods of time. Beyond the symptoms of fatigue, a flat foot puts undue stress on various joints in the foot. It is not surprising that severely flat feet often undergo arthritic changes in several of the foot's joints.
HIGH-ARCHED FOOT
The high-arched foot makes contact with the ground over a smaller area that the flat foot, mainly with the ball and heel. Because of the concentration of weight on a smaller surface, people with high-arched feet often complain of soreness and calluses on the ball and heel.
Additionally, because of the position of a joint called the subtalar, the foot becomes more rigid. this joint, located underneath the ankle joint, functions to pronate and supinate the foot. High-arched feet have difficulty adapting to uneven surfaces as well as absorbing shock. As a result, people with high-arched feet are more susceptible to ankle sprains. Calluses are a common problem for people with high-arched feet. Knee, hip and back pain may also occur due to poor shock absorption.
To determine your foot type, wet the bottom of your foot and stand on an eight-by-twelve inch sheet of cardboard or, if you have access to a beach, make a clear imprint of your foot on firmly packed, moist sand.
If the wet print of your foot covers the entire length of your footprint, from heel to toes, you have a flat foot. If there is an area between the ball and heel of your footprint that is completely dry from side to side, you have a high-arched foot.