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...
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! Disclaimer 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.
Version History The version number updated. Updates to the splash screen. Improvements to the zoom. 5.0.3 10/21/2020 Updates to the measurement menu Updates to the zoom 5.0 08/15/2020 Info screen updates. 4.3.1 08/06/2018 Minor text update. 4.3 05/07/2018 Performance fixes for iOS 9 4.2 01/23/2016 This version is optimized for iOS 8. It includes new standard measurement resources as well as expanded solutions to several cases. To view these new resources, be sure to press the "Download Current Lessons & Resources" button on the menu screen. 4 08/15/2015 Improved usability of the ruler and tick mark tool handles 3.2 08/22/2014 • Added the ability to import an x-ray, plan, and then compare the original x-ray to the planning x-ray. • Added “handles” to the Tick Mark Tool and the Ruler Tool to make it easier to control them. • Added ability to use the nudge arrows to adjust the Ruler or the selected end of the Ruler. • Added new hardware and made it appear larger. • Made the context menu flap (at the top of the deformity correction screen) semi-transparent. • Made it easier to zoom in and edit lines and points. • Added ability to delete multiple objects at one time • Improved the order of the tools in the Deformity Correction Toolbar. • When you open a case, the Line Tool is highlighted and ready to use by default without being selected first. • Improved the main menu interface. • After selecting new settings in the Settings Menu, you do not have to press “Apply” for them to take effect. 3.0 08/21/2014 Added fine lines setting. Fixed solution image bug. 2.3 03/05/2014 Fixed iOS7 bug with the tick mark tool. 2.2 12/10/2013 Fixed a small bug that caused the angle measurements to scale when using imported images. 2.1 09/02/2013 Optimized code to correct memory problems that were encountered in version 1.0. Added a “Tick Mark Tool” that allows you to draw a line that is divided in half or into thirds or fifths. Added an “Angle Template Tool” that allows you to insert an adjustable angle template. Added an option to insert hardware (e.g., external fixation, intramedullary rods, plates, screws). Modified the ruler tool so that each end of the ruler line has sharp points that allow the user to precisely place the line and increase the accuracy of the measurement. Included links to instructive YouTube videos that teach you step by step how to use Bone Ninja. Included an option to change the thickness of the lines and dots. Thicker lines and dots can be used when projecting the Bone Ninja screen so that the audience can see your work. Updated and improved content for the quick start and user guides. Improved the main menu interface. 2.0 08/07/2013 1.0 08/31/2012
Previous Versions
Here you can find the changelog of Bone Ninja since it was posted on our website on 2023-06-27 23:54:55.
The latest version is 5.0.3 and it was updated on 2026-06-29 12:07:57. See below the changes in each version.
Bone Ninja version 5.0.3
Updated At: 2026-06-29
Changes: Version History The version number updated.
Updates to the splash screen.
Improvements to the zoom. 5.0.3 10/21/2020 Updates to the measurement menu
Updates to the zoom 5.0 08/15/2020 Info screen updates. 4.3.1 08/06/2018 Minor text update. 4.3 05/07/2018 Performance fixes for iOS 9 4.2 01/23/2016 This version is optimized for iOS 8. It includes new standard measurement resources as well as expanded solutions to several cases. To view these new resources, be sure to press the "Download Current Lessons & Resources" button on the menu screen. 4 08/15/2015 Improved usability of the ruler and tick mark tool handles 3.2 08/22/2014 • Added the ability to import an x-ray, plan, and then compare the original x-ray to
the planning x-ray.
• Added “handles” to the Tick Mark Tool and the Ruler Tool to make it easier to control them.
• Added ability to use the nudge arrows to adjust the Ruler or the selected end of the Ruler.
• Added new hardware and made it appear larger.
• Made the context menu flap (at the top of the deformity correction screen)
semi-transparent.
• Made it easier to zoom in and edit lines and points.
• Added ability to delete multiple objects at one time
• Improved the order of the tools in the Deformity Correction Toolbar.
• When you open a case, the Line Tool is highlighted and ready to use by default
without being selected first.
• Improved the main menu interface.
• After selecting new settings in the Settings Menu, you do not have to press “Apply”
for them to take effect. 3.0 08/21/2014 Added fine lines setting.
Fixed solution image bug. 2.3 03/05/2014 Fixed iOS7 bug with the tick mark tool. 2.2 12/10/2013 Fixed a small bug that caused the angle measurements to scale when using imported images. 2.1 09/02/2013 Optimized code to correct memory problems that were encountered in version 1.0.
Added a “Tick Mark Tool” that allows you to draw a line that is divided in half or into thirds or fifths.
Added an “Angle Template Tool” that allows you to insert an adjustable angle template.
Added an option to insert hardware (e.g., external fixation, intramedullary rods, plates, screws).
Modified the ruler tool so that each end of the ruler line has sharp points that allow the user to precisely place the line and increase the accuracy of the measurement.
Included links to instructive YouTube videos that teach you step by step how to use Bone Ninja.
Included an option to change the thickness of the lines and dots. Thicker lines and dots can be used when projecting the Bone Ninja screen so that the audience can see your work.
Updated and improved content for the quick start and user guides.
Improved the main menu interface. 2.0 08/07/2013 1.0 08/31/2012
Bone Ninja version 5.0.3
Updated At: 2020-10-21
Changes: Oct 21, 2020
Version 5.0.3
The version number updated.
Updates to the splash screen.
Improvements to the zoom.
Bone Ninja version 5.0.3
Updated At: 2020-10-21
Changes: The version number updated.
Updates to the splash screen.
Improvements to the zoom.
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