Treatment of Osteosarcoma of the Talus With a 3D-Printed Talar Prosthesis

Abstract

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Dynamic finite element analyses to compare the influences of customised total talar replacement and total ankle arthroplasty on foot biomechanics during gait

“…We propose that the injury-site geometries, despite degenerative changes, can be considered in the prosthesis design process through an approach of pre-matching and predictive simulations. In addition, the surgical details of TTR, such as ligament repairment after implant installation, need to be unified across different studies [ 14 , 18 ]. Without ligament constraints, the implanted joint loses a portion of its stability and exceeds the normal motion range.…”

“…The TTR condition was simulated by replacing the talus with a prosthesis reconstructed from the mirror image data of the participant's left talus [ 12 , 14 ]. The talus prosthesis was assigned with the material property of cobalt-chromium and slightly polished to mimic the 3D printing texture ( Fig.…”

“…A customised talus prosthesis accounts for individual-specific anatomies in its geometries and is, therefore, more likely to articulate with the adjacent joint surface, which is anticipated to better consolidate the joint structure and fulfil ankle function [ 11 ]. Recently, a growing body of clinical studies has reported positive outcomes for TTR treatment [ [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] ]. Despite the varying design, TTR exhibited consistent performance in regaining ankle mobility [ 10 , 11 , 15 , 17 ], easing pain [ 10 , 13 , 15 ], and improving life quality [ 10 , 15 ].…”

“…The TAA condition was represented by creating a set of prefabricated Scandinavian TAA components [ 20 ] in the foot model assembly. The TTR customisation procedure was mimicked by reconstructing a model part of the talar prosthesis from the mirror image data of the contralateral ankle site, which is a common practice in clinical studies in the related field [ 12 , 14 , 21 ]. Because a growing body of evidence indicated that a prosthesis design with a higher approximation to the native ankle anatomy facilitates the restoration of ankle functions [ [21] , [22] , [23] ], we hypothesised that TTR would better reproduce the foot kinematics and force distribution of an intact foot than would TAA.…”

Percutaneous Osteoplasty for the Management of a Talar Metastasis: A Case Report

“…Finally, this patient achieved excellent functional and clinical outcomes without local recurrence or distant metastasis. 13 In contrast to primary talar tumors, most patients with talar metastases were in an advanced period.…”