Foot orthotics (also known as "orthoses") are foot supports customized to fit your feet more efficiently than over-the-counter (OTC) arch supports. Your orthotist will design them to balance the biomechanical inadequacies of your feet and legs. Most orthotics used are for arch and heel pain (plantar fasciitis), knee pain (e.g. chondromalacia patellae, or “runner’s knee”) or lower leg tendonitis (eg Achilles tendon, or “shin splints”). Your orthotist will make a cast of your foot and use measurements of your foot and legs and note your exact medical condition to give you the full support you need.