Office of Technology Transfer – University of Michigan

Web-Based Hip Arthroplasty Templating System

Technology #4866

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Andrew G. Urquhart
Managed By
Drew Bennett
Associate Director - Software Licensing 734-615-4004

Difficulties with arthroplasy templating

When a patient’s medical condition necessitates the surgical replacement of the hip joint with an artificial prosthesis (reconstructive hip arthroplasty), pre-operative planning is vital in preparation. Part of that process is the production of a template for the replacement. The traditional method for templating requires the use of printed radiographs and measurements made using transparent templates of the implants provided by the implant manufacturer. Recently computerized systems have come to market to assist in templating digital radiographs. These systems are generally large software packages that are linked to the institutional radiology PACS (Picture Archiving and Communication System) system and generally require a significant initial investment and institutional support to implement.

Linking digital templating to digital radiographs

Researchers at the University of Michigan have developed a standalone, PACS-agnostic, web-browser-based, digital templating system which requires no installation at the site prior to use, allowing for individual surgeons to easily access this system. This system imports the radiographic image from the individual workstation and completes all processing on the workstation, thus eliminating risks associated with confidential medical image data transmission. System users determine the image scale based on a marker of known size, process and store digital templates, draw templating lines and objects over the radiograph, and perform and display calculations made while templating a hip arthroplasty. The templating information for each case can be saved to the user’s online account for later retrieval without transmitting or storing confidential medical image data, but instead linking via a unique identifier. This storage technique without the image data keeps the medical imaging security in the hands of the user.

Applications and Advantages


  • Templating hip anthroplasty


  • Web-browser accessible
  • Does not store confidential medical image data
  • Uses HTML5, CSS, & JavaScript to allow universal access