Three-dimensional geometric analysis of the talus for designing talar prosthetics

Kamrul Islam, Ashlee Dobbe, Kajsa Duke, Marwan El-Rich, Sukhvinder Dhillon, Samer Adeeb, Nadr M. Jomha

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Proper understanding of the complex geometric shape of the talus bone is important for the design of generic talar body prosthetics and restoration of the proper ankle joint function after surgery. To date, all talus implants have been patientspecific with the limitation that complex computer modeling is required to produce a mirrored image from the unaffected opposite side followed by machining a patient-specific prosthesis. To develop an ''off-the-shelf'' non-custom talar prosthesis, it is important to perform a thorough investigation of the geometric shape of the talus bone. This article addresses the applicability of a scaling approach for investigating the geometric shape and similarity of talus bones. This study used computed tomography scan images of the ankle joints of 27 different subjects to perform the analysis. Results of the deviation analyses showed that the deviation in the articulating surfaces of the talus bones was not excessive in terms of talus size. These results suggest that a proposed range of five implant sizes is possible. Finally, it is concluded that the talus bones of the ankle joints are geometrically similar, and a proposed range of five implant sizes will fit a wide range of subjects. This information may help to develop generic talus implants that might be applicable to patients with a severe talus injury.

Original languageBritish English
Pages (from-to)371-378
Number of pages8
JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume228
Issue number4
DOIs
StatePublished - Apr 2014

Keywords

  • Deviation Analysis
  • Geometric Similarity
  • Implants
  • Prosthesis
  • Scaling
  • Talus

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