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By International Center for Limb Lengthening, Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore

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Multiplier App:

-The Multiplier App automates calculations to predict mature height and bone length in children. This method was created originally in Baltimore at the University of Maryland, and subsequently developed at the International Center for Limb Lengthening (ICLL), Rubin Institute for Advanced Orthopedics (RIAO), Sinai Hospital of Baltimore.

-We have taught the Multiplier Method over the past 10 years at our annual Baltimore Limb Deformity Course ( These calculations are typically performed by hand, using various formulas. Certain calculations are easy, but others involve more complicated formulas. Utilizing this App will reduce the time needed for these routine calculations, and decrease errors. You need only input the values about a patient (sex, age, length) and the App will execute the required Multiplier formula.

The Multiplier Method APP will allow you to make the following calculations:
•Lower Extremity
•Limb Length Discrepancy (congenital)
•Limb Length Discrepancy (developmental)
•Growth Remaining
•Bone Length at Maturity
•Timing of Angular Correction
•Timing of Epiphysiodesis
•Upper Extremity
•Limb Length Discrepancy (congenital)
•Limb Length Discrepancy (developmental)
•Growth Remaining
•Bone Length at Maturity
•Sitting Height
•Lower Extremity Length
•Fetus – LLD of Tibia/Femur at Birth and Maturity
•Foot Length
•Foot Length Discrepancy
•Spine Height

This APP also provides the following additional resources: User’s Guide, Standard Measurements for the Lower Limb and Foot, Multiplier Tables, Multiplier Formulae, Development of Apophyses, Epiphyses, and Bones figures, Elbow Scoring System to Determine Skeletal Age

Disclaimer: No growth prediction method is 100% accurate; this App is not a substitute for sound and careful clinical judgment.

What's New in Version 3.5

We have improved The Multiplier App to reduce errors during data entry. In previous versions of the app, a default sex ("male") was pre-selected on each data entry screen. We observed that some users did not verify that the default sex was correct before pressing the calculate button. In this new version, no default sex is selected. If users fail to enter male/female for sex, an error message will appear that prompts them to select male or female. In the Fetus section, the error message prompts the user to select "male, female, or unknown."

iPhone Screenshot

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  • Free
  • Category: Medical
  • Updated:
  • Version: 3.5
  • Size: 26.0 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

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