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A smartphone photogrammetry method for digitizing prosthetic socket interiors.

Amaia Hernandez1, Edward Lemaire2

  • 11 The Ottawa Hospital Research Institute, Ottawa, ON, Canada.

Prosthetics and Orthotics International
|September 11, 2016
PubMed
Summary

A new photogrammetry technique uses a smartphone camera to create low-cost 3D digital models of prosthetic sockets. This accessible method aids in prosthetic computer-aided design and computer-aided manufacturing (CAD/CAM) workflows.

Keywords:
Computer-aided design/computer-aided manufacturingdigitizefabrication techniquesphotogrammetryprostheticssmartphonesocket

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Digital Imaging

Background:

  • Accurate 3D limb models are essential for prosthetic Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) systems.
  • Existing 3D scanners struggle to capture socket interiors accurately and can be prohibitively expensive.
  • There is a need for cost-effective and accessible methods for digitizing prosthetic socket interiors.

Purpose of the Study:

  • To develop and evaluate a low-cost photogrammetry method for digitizing prosthetic socket interiors.
  • To assess the feasibility of using smartphone-based photogrammetry for prosthetic CAD/CAM applications.
  • To provide an accessible alternative to expensive dedicated 3D scanning systems.

Main Methods:

  • Capture 15 two-dimensional images of the socket interior using a smartphone camera.
  • Generate a 3D model from the captured images utilizing cloud-based photogrammetry software.
  • Compare linear measurements between physical sockets and their corresponding 3D models.

Main Results:

  • The 3D reconstruction accuracy averaged 2.6 ± 2.0 mm and 0.086 ± 0.078 L.
  • While less accurate than high-end 3D scanners, the method provides a viable digital socket reproduction.
  • The processing of the 3D model in prosthetic CAD software is feasible.

Conclusions:

  • The proposed smartphone photogrammetry method offers a low-cost and accessible solution for prosthetic socket digitization.
  • This technique can be integrated into prosthetic CAD/CAM systems, improving accessibility for clinicians and patients.
  • Further refinement may enhance accuracy for clinical applications.