Abstract
Summary Statement
We are taking very expensive cutting edge technology, usually reserved for industry, and using it with the help of open source free software and a cloud 3D printing services to produce custom and anatomically unique patient individual implants for only £32. This is approx. 1/100th of the traditional cost of implant production.
Introduction
3D printing and rapid prototyping in surgery is an expanding technology. It is often used for preoperative planning, procedure rehearsal and patient education. There have been recent advances in orthopaedic surgery for the development of patient specific guides and jigs. The logical next step as the technology advances is the production of custom orthopaedic implants. Our aim was to use freely available open source software, a personal computer and consumer access online cloud 3D printing services to produce an accurate patient specific orthopaedic implant without utilising specialist expertise, capital expenditure on specialist equipment or the involvement of traditional implant manufacturing companies. This was all to be done quickly, cost effectively and in department.
Methods & Materials
Using standard computed tomography (CT) scan and the standard file format of digital imaging and communications in medicine (DICOM) data, a 3D surface reconstruction was made of a cadaveric radial head using the software OsiriX (DICOM image processing software for Apple OS X). This data was then processed in Meshlabs (a system for the processing and editing of unstructured 3D triangular meshes) to create a mirror image 3D model of the radial head with a stem added to produce prosthesis suitable to replace the contra lateral radial head. Both packages are distributed under open-source licensing—Lesser General Public Licence (LGPL)—and are therefore free. This was then uploaded and 3D printed using a process of selective laser sintering (SLS) in stainless steel via the commercial cloud printing service Shapeways.com.
Results & Conclusions
The model produced was an accurate mirror image replica of the patient's original anatomy (all measurements equal +/− 0.2mm using TS411212 Digital Vernier Expert Caliper 300mm P=0.001 Showing no significant statistical difference. Production from original CT scan took a total of 10 days and the total cost including shipping was £32. This was then re-implanted in to the contra lateral cadaveric radius. We achieved our aims and goals of quick, cost effective and accurate implant creation.
