<unk> s, also known as shoe inserts, are commonly used as therapy for leg-length differences leading to knee, hip, and back pain. They attempt to reduce stress on the Achilles' tendon during healing, and for various rehabilitation uses. The intent of a<unk>  is not to absorb shock or spread pressure on the foot, but to raise one foot in order to shift balance and gait. As such, these products should be firm and not compressible, in order to add a constant amount of height without causing the<unk>  to rub vertically in the shoe. A commonly used formula for calculating the amount<unk>  necessary for short leg syndrome was presented by David Heilig: where Duration (D) is SBU is Sacral Base Unleveling (SBU), and L is the amount of<unk>  required (L). and Compensation (C)> is absent (none) = 0 pts Sidebending and rotation (of the spine) = 1 pt Wedging, facet size changes, endplates with horizontal growths, spurring = 2 pts The maximum<unk>  measure within the shoe (i.e., between the<unk>  and the insole) is 1/4 inch, while the maximum<unk>  from the<unk>  to the floor is 1/2 inch.
Heel lift
Total contact casting
Shoe insert
Hip resurfacing
Buttock augmentation
Auricular splint
Chondroplasty
Military brace