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Heel lifts, 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 heel lift is: not to absorb shock/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 heel to rub vertically in the shoe.

A commonly used formula for calculating the amount lift necessary for short leg syndrome was presented by David Heilig:

${\displaystyle L<※/※}$

where Duration (D) is
${\displaystyle 0-10}$ years = ${\displaystyle 1pt}$
${\displaystyle 10-30}$ years = ${\displaystyle 2pts}$
${\displaystyle 30+}$ years = ${\displaystyle 3pts}$

SBU is Sacral Base Unleveling (SBU), and L is the amount of Lift 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 lift measure within the shoe (i.e., between the heel and the insole) is /₄ inch, while the maximum lift from the heel to the floor is /₂ inch.

References※

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