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Table 1 An overview of the individual prescription variables

From: Consensus-based recommendations of Australian podiatrists for the prescription of foot orthoses for symptomatic flexible pes planus in adults

Prescription variable Method of manufacture
Cast Pour Negative cast is held in the prescribed position, based on a bisection of the posterior heel relative to the supporting surface, while liquefied plaster is poured into negative cast
  Inverted Indicates that the negative cast, when poured, is held in an inverted position relative to the heel bisection
  Neutral Indicates that the negative cast, when poured, is held in a vertical position relative to the heel bisection
  Everted Indicates that the negative cast, when poured, is held in an everted position relative to the heel bisection
Medial heel (Kirby) skive Indicates a small amount of plaster is skived away from the medial heel of the positive cast (skive is generally angled 15 degrees varus/inverted to the plane of the plantar surface of the forefoot post)
Rearfoot post An addition, typically fashioned from a heat mouldable material, that is applied to the final orthosis to stabilise the heel in a vertical position or angle it in the frontal plane (also known as a heel stabiliser)
  No post No external rearfoot post
  Extrinsic An external heel post that stabilises the orthosis in a vertical position
  Extrinsic (inverted) An external heel post that tilts the orthosis into an inverted position
  Extrinsic (everted) An external heel post that tilts the orthoses into an everted position
  Extrinsic (with motion) An external heel post that has a bi-planar grind on the plantar aspect
Arch fill The plaster expansion applied to the medial longitudinal arch area of the positive cast
  Minimal A decreased plaster expansion
  Standard A standard plaster expansion
  Maximum An increased plaster expansion
Flange A midfoot extension of the final orthosis border, typically prescribed in conjunction with a deep and distally extended heel cup
  Medial A superomedial extension
  Lateral A superolateral extension
Forefoot post A corrective reference platform applied to the medial and/or lateral forefoot
  Balanced to perpendicular The reference platform applied to the plantar forefoot to hold the forefoot alignment as parallel to the supporting surface and perpendicular to the rearfoot
  Intrinsic The reference platform is applied to the positive cast
  Extrinsic The platform is applied to the shell of the final orthosis
  No post No reference platform applied
1st ray cut out The removal of the mediodistal section (sub 1st ray) of the final orthosis
1st MTPJ The removal of the mediodistal section (sub 1st MTPJ) of the final orthosis
Plantar fascia groove A groove that transverses the long axis of the orthosis (sub medial slip of the plantar aponeurosis)
Metatarsal dome A dome-shaped pad applied under or slightly proximal to the plantar aspect of the metatarsal heads
  Intrinsic The dome is removed from the plaster of the positive cast
  Extrinsic An external dome shaped pad is applied to the final orthosis
Cuboid filler A increased plaster expansion applied to sub-calcaneocuboid area of the positive cast
Heel aperture A circular area removed from the plantar heel cup of the shell of the final orthosis
  1. Notes: MTPJ = metatarsophalangeal joint. Negative cast - plaster cast impression of the foot (generally made from plaster or paris bandage), Positive cast - plaster mould of the foot that is formed as the result of liquefied plaster poured into the negative cast.