iPad Screenshots


Bone Ninja is a teaching tool developed by two orthopedic surgeons who specialize in limb deformity correction: Dr. Shawn Standard and Dr. John Herzenberg. It is designed to help surgeons learn to analyze long bone deformities. Bone Ninja comes pre-loaded with radiographs of normal legs and deformed legs. You can analyze the provided cases or upload your own. Once your analysis is complete, you can then use the cut-out tool to try different osteotomy solutions. Suggested solutions for the provided cases are available for comparison.

Bone Ninja includes tools for drawing lines, measuring angles, measuring lengths, and calibrating the magnification. The cutting tool allows you to manipulate one or more fragments to simulate correction of single or multilevel deformities. The analysis of the radiographs is based on methodology taught at our annual Baltimore Limb Deformity Course (BLDC), now in its 22nd year (DeformityCourse.com). We developed this app to supplement the BLDC and look forward to feedback from attendees and other users. Bone Ninja is not presented as a clinical tool, but rather an educational tool. It will not “automatically” analyze deformities. The student must first learn the methodology of analyzing and planning deformity correction in order to use Bone Ninja. Bone Ninja is a 21st century mobile alternative to pencil, ruler, goniometer, and paper.

Bone Ninja will be periodically updated by adding more case examples, more explanations, and more tools. The name “Bone Ninja” is intentionally whimsical and reflects our philosophy of teaching as “infotainment.” Enjoy!

The Bone Ninja App is designed for educational purposes only. The intent is to train physicians how to analyze long bone deformities. The Bone Ninja App is not intended to be used for medical diagnosis or treatment. In view of the possibility of human error or changes in medical science, neither the authors nor the developer warrant that the information contained in this software is accurate or complete and they are not responsible for any errors or omissions or the results obtained from the use of such information.

What’s New

Version 4.3.1

Info screen updates.

Ratings and Reviews

المشغوول ,

Nice work

Great to have an app that simulates real work planing .. You can cut , rotate , mark and make lines and angles .. It is very good for proper planning .. I hope to have a land scape view ..
And I hope they keep on developing , not like other apps that became like ghost apps .

Peds Orthopedic Doc ,

Bone Ninja

Super cool app that allows me to plan bone deformity surgeries based on Pre-op x-Rays. Easy to use, and great for educating my patients on what to expect.

WTF all the nicknames are taken ,

Problem keeping app open

Great app but since I updated to iOS 7, the app keeps shutting down. It tends to consistently happen when I use the divided line tool. Please fix this, because I love using this app to help prepare for cases.


LifeBridge Health
34.7 MB
Requires iOS 8.0 or later. Compatible with iPad.
Age Rating
Rated 4+
© 2018, Sinai Hospital of Baltimore, Inc.


  • Family Sharing

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

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