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Orbital implants: material matters
  1. Ludwig M Heindl1,2,
  2. Alexander Christopher Rokohl1,2
  1. 1 Department of Ophthalmology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
  2. 2 Center for Integrated Oncology (CIO) Aachen-Bonn-Cologne-Dusseldorf, Cologne, Germany
  1. Correspondence to Professor Ludwig M Heindl, Department of Ophthalmology, University Hospital of Cologne, 50937 Cologne, Germany; Ludwig.heindl.BJO{at}

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In ‘Case series of shrinking hydroxyapatite orbital implants’, Han et al 1 draws attention to a particularly interesting postoperative complication. The authors report the potential shrinking of mammalian bone-derived hydroxyapatite orbital implants by osteoclastic activity, which may lead to orbital volume loss. This volume loss might affect the cosmesis and the prosthesis motility leading to a significantly reduced quality of life.2–5 However, this study did not …

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  • Contributors Both authors conceived of the presented work and approved the final version of the manuscript. ACR drafted and LMH critically revised the manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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