Mathematic model to estimate change in burn scar length required for joint range of motion

Burn scar contracture results from an insufficient amount of extensible tissue to permit complete range of motion. The purpose of this study was to develop a mathematic model to estimate additional tissue length required for full range of motion in the presence of a scar contracture. Seven areas with a known predilection for burn scar contracture were assessed. Twenty-five volunteers with normal range of motion had the length of their limbs measured at predetermined angles. Changes in limb length through range of motion were documented. On the basis of these changes, a mathematic model was developed to estimate the additional amount of tissue length required to complete range of motion for each area. This information may be useful to determine burn patient rehabilitation potential or need for reconstructive surgery.