A new digital technique in predicting implant size for pre-operative planning in total hip arthroplasty

Research output: Contribution to journalArticle

Abstract

Digital templating in total hip arthroplasty (THA) is the preparation process of the pre-surgery scenario by using digital implant and x-ray. According to surgeons from Medical Center of Universiti Kebangsaan Malaysia (UKMMC), conventional methods are still used to find a suitable implant for the patient. Therefore, a digital method should be developed so that the implant size detection process can be effectively implemented. This paper will show how the implant was designed for use in a digital environment. Manual implant templates used by UKMMC are used as the basis for the implant design. To match the digital implant and X-ray images with the computer screen, the pixel ratio between computer display and the digital X-ray images of patients is generated using the resolution information and X-ray image pixel density. The pixel ratio is then used in magnification algorithm to enlarge or reduce the size of a digital implant. A total of 20 X-ray patients were randomly selected to test the accuracy and effectiveness of the developed digital technique. Results showed this technique predicted stem component size well, with 55% within similar size and acetabular component was predicted slightly better with 60%. In addition, by using digital implant with high resolution, X-ray image enlargement can be up to 100% successful without affecting the image of the digital implant.

Original languageEnglish
Pages (from-to)1071-1078
Number of pages8
JournalInternational Review on Computers and Software
Volume6
Issue number6
Publication statusPublished - 2011

Fingerprint

Arthroplasty
Planning
X rays
Pixels
Surgery
Display devices

Keywords

  • Digital
  • Implant
  • Magnification
  • Scaling
  • Size
  • Total hip arthroplasty

ASJC Scopus subject areas

  • Computer Science(all)

Cite this

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title = "A new digital technique in predicting implant size for pre-operative planning in total hip arthroplasty",
abstract = "Digital templating in total hip arthroplasty (THA) is the preparation process of the pre-surgery scenario by using digital implant and x-ray. According to surgeons from Medical Center of Universiti Kebangsaan Malaysia (UKMMC), conventional methods are still used to find a suitable implant for the patient. Therefore, a digital method should be developed so that the implant size detection process can be effectively implemented. This paper will show how the implant was designed for use in a digital environment. Manual implant templates used by UKMMC are used as the basis for the implant design. To match the digital implant and X-ray images with the computer screen, the pixel ratio between computer display and the digital X-ray images of patients is generated using the resolution information and X-ray image pixel density. The pixel ratio is then used in magnification algorithm to enlarge or reduce the size of a digital implant. A total of 20 X-ray patients were randomly selected to test the accuracy and effectiveness of the developed digital technique. Results showed this technique predicted stem component size well, with 55{\%} within similar size and acetabular component was predicted slightly better with 60{\%}. In addition, by using digital implant with high resolution, X-ray image enlargement can be up to 100{\%} successful without affecting the image of the digital implant.",
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