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Accuracy and repeatability of 3D Photogrammetry to digitally reconstruct bones.

J C Feddema¹, L Z F Chiu¹

¹Neuromusculoskeletal Mechanics Research Program, Faculty of Kinesiology, Sport, and Recreation, University of Alberta, T6G 2H9 Edmonton, AB, Canada.

Morphologie : Bulletin De L'Association Des Anatomistes

|July 4, 2024

Summary

Three-dimensional (3D) photogrammetry accurately reconstructs human bones from digital images. This repeatable method allows for precise quantitative analysis and preservation of anatomical specimens for educational purposes.

Keywords:

Anatomy education Biomechanical modeling Skeletal anatomy Structure-from-motion

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Area of Science:

Biomedical Engineering
Anatomical Sciences
Digital Imaging

Background:

Digital reconstruction of physical objects is increasingly feasible with advanced computing.
Assessing the accuracy of three-dimensional (3D) photogrammetry for human bone reconstruction is crucial due to anatomical variations.

Purpose of the Study:

To evaluate the accuracy and repeatability of 3D photogrammetry for reconstructing human bones.
To determine the suitability of 3D photogrammetry for quantitative analysis and anatomical preservation.

Main Methods:

Five human bones (femur, radius, scapula, vertebra, patella) were digitized using 3D photogrammetry.
Landmarks were placed on physical bones and their distances measured.
Measurements were compared between physical bones and digital 3D reconstructions.
Repeatability was assessed by taking images on separate days.

Main Results:

Mean absolute differences between physical measurements and 3D reconstructions ranged from 0.2±0.1mm to 0.4±0.2mm.
Mean absolute differences between reconstructions (repeatability) ranged from 0.3±<0.1mm to 0.4±0.4mm.
The 3D photogrammetry method demonstrated high accuracy and repeatability.

Conclusions:

The described 3D photogrammetry procedures are accurate and repeatable for human bone reconstruction.
Quantitative analyses can be reliably performed on these digital reconstructions.
3D photogrammetry offers a valuable tool for capturing and preserving anatomical materials for education.