A technique for calculating limb length inequality and epiphyseodesis timing using the multiplier method and a spreadsheet

James O. Sanders, Joseph G. Khoury, Shyam Kishan

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Purpose: Limb length inequality and epiphyseodesis timing calculations are common in pediatric orthopedics. The multiplier method developed by Paley et al. has significantly simplified the calculation of ultimate limb length. The calculation of limb length inequality has also become very simple for congenital limb length inequalities. However, the equations for limb length inequality from acquired differences and epiphyseodesis timing are not simple, and are prone to arithmetic errors. Methods: To limit these errors, we have developed a spreadsheet which finds the appropriate multipliers, solves the equations, and computes the predicted limb length inequality and the appropriate age for an epiphyseodesis. Results: This method of using a spreadsheet and the multiplier calculations is quite simple and quick to use in practice. The calculations can be cut and pasted into computerized charts for future reference. Conclusions: We recommend this method for clinical use and make it available for public use.

Original languageEnglish (US)
Pages (from-to)151-155
Number of pages5
JournalJournal of Children's Orthopaedics
Volume1
Issue number2
DOIs
StatePublished - Jul 2007

Keywords

  • Calculations
  • Limb length inequality
  • Multiplier method

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Orthopedics and Sports Medicine

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