What Are Orthotics?
  Orthotics are custom-made inserts that are worn inside of shoes. They can be 
  used to relieve pain, improve skeletal alignment, improve the function of your 
  foot and lower limb, or improve the overall neurological function of your entire 
  body.
What Do Orthotics Do? 
  Depending on the design, orthotics can cushion and support your foot by redistributing 
  the pressure areas on your feet. They can also be designed to support and improve 
  the alignment of the bones in your feet and legs. Improper foot alignment can 
  lead to a wide variety of foot, knee, and lower back problems. By improving 
  the alignment, the body is able to function more efficiently with less stress 
  on the muscles and ligaments that hold you together. Many different styles and 
  types of orthotics can be designed in order to alleviate various types of pain 
  in the feet, knees, hips and lower back. These can range from soft flexible 
  moulds to very rigid types. It is important to have your foot and shoes properly 
  evaluated prior to getting orthotics. Beware of companies that provide only 
  one type of orthotic—it may not be right for your foot.
Foot Types:
  There are two general types of misaligned feet. Pes planus, (flat flexible feet) 
  and pes cavus, (rigid high arched feet.) The flexible flat foot is commonly 
  named the “over-pronator.” The arch of this foot type collapses 
  towards the ground upon standing. This creates excessive collapse of the feet, 
  and will subsequently create excess movement up into the legs and knees. 
The rigid high arched foot, called a supinator, has a high arch contour even 
  when weight bearing. This foot type tends to have poor shock absorption and 
  cushioning, and can lead to various joint pains. 
Will Orthotics Change My Feet?
  Orthotics work to support and re-position your feet. Like eyeglasses, they help 
  us while we are wearing them. When we remove the orthotics, they have not changed 
  our feet at all. Orthotics allow us to maintain our lifestyle and activities 
  while reducing the symptoms. Orthotics are often prescribed as a method of treatment 
  for an injury or as a performance enhancement tool. Orthotics will help you 
  to recover from injury as well as prevent it from recurring.
Can I Wear Orthotics With Any Shoes? 
  Orthotics are designed with a particular shoe type in mind, and as such should 
  work well with shoes of similar style. If an orthotic is designed for running 
  shoes, it will not fit properly into a heeled shoe. Sandals also restrict orthotic 
  use, as the orthotic is not secure without a closed shoe.
  I Have Flat Feet - Does This Have Anything To Do With 
  Why I Have Lower Back Pain? 
  Flat feet cause the leg bones to rotate inwards when you are standing and walking. 
  This will affect your hip and pelvic positions, thereby altering the amount 
  of back curvature and leading to pain. Previous injury, activities, and upper 
  body mechanics will also play a role in lower back pain.
Do My High Arch Feet Have Anything To Do With My Knee 
  Pain When I Run? 
  A high arched foot lacks adequate shock absorption. When there is not enough 
  cushioning at the foot, shock is transmitted upwards, placing added load on 
  the knee joints.
Can Orthotics Help With Arthritis and Diabetes? 
  In patients with arthritis or diabetes, special care is taken in supporting 
  the feet, while also relieving excessive pressure areas and providing cushioning 
  to the feet. Typically, these orthotics act as special supportive pillows for 
  your feet.