This video covers the basics of the free open source CGI software named Blender, and how to utilize it in the planning of orthopaedic surgery using 3D bone models that are generated from CT scans. The modeling and animation of bones and joints is covered, as well as the principles of deformity correction using cutting guides in the 3D environment using the Add on script - OrthoMesh3D. Explanation for converting pictures of implants to 3D models is provided. Lastly, a case example of forearm deformity correction is provided in addition to animation and simulation methods using the Blender's Armature tool. The processes described in this video and software used are for research and virtual planning, NON FDA approved software is used. Not intended for clinical use in the USA.