gms | German Medical Science

14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT)

17.06. - 21.06.2019, Berlin

Clinical Outcomes With the Amandys® Wrist Implant: Results of Seven Patients

Meeting Abstract

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  • presenting/speaker Benjamin Hope - Brisbane Hand and Upper Limb Research Institute, Brisbane Private Hospital, Brisbane, Australia
  • Greg Couzens - Brisbane Hand and Upper Limb Research Institute, Brisbane Private Hospital, Brisbane, Australia
  • presenting/speaker Mark Ross - Brisbane Hand and Upper Limb Research Institute, Brisbane Private Hospital, Brisbane, Australia

International Federation of Societies for Surgery of the Hand. International Federation of Societies for Hand Therapy. 14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT). Berlin, 17.-21.06.2019. Düsseldorf: German Medical Science GMS Publishing House; 2020. DocIFSSH19-142

doi: 10.3205/19ifssh0633, urn:nbn:de:0183-19ifssh06339

Published: February 6, 2020

© 2020 Hope et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.


Outline

Text

Objectives/Interrogation: The Amandys is a free interposition pyrocarbon implant that is designed to replace the lunate, proximal one-third to two-thirds of the scaphoid and the proximal capitate. It preserves bone in the carpus and radius and it does not compromise other options such as total fusion, total wrist replacement or proximal row carpectomy with capitate resurfacing. The design allows for a good range of stable movement whilst preserving the "dart-throwing motion". Its three axes of movement allow it to act as a mobile and adaptive spacer which can slide, roll and rotate. This study examined clinical and patient-reported outcomes of the Amandys implant in seven patients.

Methods: In our unit we treated seven patients with interposition arthroplasty using the Amandys implant. One of these patients had a primary diagnosis of Kienböck's disease. Median age at surgery was 58 years (range 41 - 67 years). Five patients had surgery on the dominant size. The median follow-up period was 24 months (range 3 - 73 months).

Results and Conclusions: Patients reported a median improvement in pain from 56 at pre-operative assessment to 36.5 at most recent follow up. Median PRWHE score decreased from 58.5/100 to 46.5/100. Median QuickDASH score decreased from 64/100 to 42/100. Median grip strength was 23 kg (61% of the contralateral side) before surgery versus 22 kg (70% of the contralateral side) at most recent follow-up. Patient satisfaction at most recent follow-up ranged from 66/100 to 95/100. No adverse events such as infection, subluxation or dislocation were reported.

The Amandys implant provides an alternative surgical option to wrist fusion and total wrist arthroplasty. Additionally, the minimal bone resection required allows for preservation of the important dorsal and volar extrinsic ligaments and motion at the radiocarpal and midcarpal joints.