Custom 3D-Printed Total Talar Prostheses Restore Normal Joint Anatomy Throughout the Hindfoot.

Published

Journal Article

BACKGROUND::Third generation total talar prostheses (TTPs) are viable options for talar avascular necrosis (AVN) in the absence of neighboring joint pathology. The use of modern three-dimensional (3D) printing allows the production of custom implants that exactly mimic the patient's anatomy. The aim of this study is to determine the accuracy of 3D printing in reproducing a synthetic talus and, in doing so, restoring more normal anatomical relationships. We hypothesize that this mode of replication will restore and maintain normal radiographic alignment of the ankle, subtalar, and forefoot joints in the setting of talar AVN. METHODS::A retrospective analysis was performed on all patients undergoing TTP implantation for the treatment of talar AVN between 2016 and 2017. Radiographic measurements were taken preoperatively and postoperatively to determine native talar dimensions, TTP implant dimensions, and the corresponding radiographic alignment about the forefoot, hindfoot, and ankle. RESULTS::A total of 14 patients were identified in our cohort. Talar arc length and width were not found to be significantly changed; however, talar height was significantly increased with use of TTP. Five alignment dimensions were measured, of which, only talar tilt angle was significantly changed. Instances of Meary's angle correction were observed in cavus and planus foot deformity. CONCLUSION::As a proof of concept, 3D-printed TTP was successful in restoring talar height and talar tilt in the setting of AVN. Additionally, the procedure maintained normal alignment in nonpathological joints. TTPs, based on our cohort, are a viable option to restore more normal anatomical alignment. LEVELS OF EVIDENCE::Level IV: Case series.

Full Text

Duke Authors

Cited Authors

  • Tracey, J; Arora, D; Gross, CE; Parekh, SG

Published Date

  • February 2019

Published In

Volume / Issue

  • 12 / 1

Start / End Page

  • 39 - 48

PubMed ID

  • 29537314

Pubmed Central ID

  • 29537314

Electronic International Standard Serial Number (EISSN)

  • 1938-7636

International Standard Serial Number (ISSN)

  • 1938-6400

Digital Object Identifier (DOI)

  • 10.1177/1938640018762567

Language

  • eng