Prediction of height, limb length and limb length discrepancy are all done using the Paley Multiplier method. Instead of using the Multiplier tables, a calculator and formulae this app allows you to enter patient age, sex and length parameters in order to calculate the prediction. Using this app you can predict limb length and limb length discrepancy at maturity for congenital and developmental discrepancies of the lower or upper limbs. It allows calculation of the age of epiphysiodesis for a desired correction and growth remaining. Standing and sitting height at maturity in normals and in achondroplasia can also be predicted. Foot length and fetal bone and limb length discrepancy can also be predicted. The multiplier growth charts and deformity parameters are also included for reference. The multiplier method is as or more accurate than other growth prediction methods and validation studies are published and referenced in the bibliography.

- Dr. Dror Paley, M.D.

What’s New

Version 3.0

Added: Congenital LLD and Growth Remaining sections now have a list of the predicted discrepancy/growth remaining at each age. Timing of epiphysiodesis can be done in both skeletal age and chronological age. The ability to email the results for review and comparison in the future. Fixed: Achondroplasia shows the correct graph for girls

Ratings and Reviews

4.5 out of 5
2 Ratings

2 Ratings

Mkaisermann ,

Good app

Congrats for this app. Please, check the achondroplasia algorithms. Final height prediction curves for females are being shown on male graphs.

Former Fellow ,

Great app to have!

Dr. Paley kept saying that his fellows carried the paper chart all the time in their wallet, which was true, now it's time for every Jedi and new J.I.T.s to download this app to their iLightsaber.

Peds Ortho Attending ,

"Paley" Deformity App!

Excellent App for anyone doing pediatric orthopedics!


Eric Townsend
28.3 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Medical/Treatment Information


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like