Technical Brief

Thoracic Volumes Correlated With Pulmonary Function Tests in Adult Scoliosis Patients Following Different Treatments in Adolescence

[+] Author and Article Information
Po-Chih Lee

Department of Mechanical Engineering,
Earl E. Bakken Medical Devices Center,
University of Minnesota,
Minneapolis, MN 55455
e-mail: leex6846@umn.edu

Arthur Erdman

Department of Mechanical Engineering,
Earl E. Bakken Medical Devices Center,
University of Minnesota,
Minneapolis, MN 55455
e-mail: agerdman@umn.edu

Charles Ledonio

Innovative Surgical Designs, Inc.,
Wayne, PA 19087
e-mail: cledonio@innovativesd.net

A. Noelle Larson

Department of Orthopedic Surgery,
Mayo Clinic,
Rochester, MN 55905
e-mail: larson.noelle@mayo.edu

David Polly

Department of Orthopaedic Surgery,
University of Minnesota,
Minneapolis, MN 55454
e-mail: pollydw@umn.edu

1Corresponding author.

Manuscript received March 12, 2018; final manuscript received September 24, 2018; published online November 19, 2018. Editor: Rupak K. Banerjee.

J. Med. Devices 13(1), 014503 (Nov 19, 2018) (4 pages) Paper No: MED-18-1052; doi: 10.1115/1.4041634 History: Received March 12, 2018; Revised September 24, 2018

In this paper, a previously developed medical software using orthogonal frontal and lateral X-rays is employed to reconstruct the rib cage and thoracic volume for scoliosis patients. The thoracic volumes of ten adult scoliosis patients with different treatments during their adolescence are followed up. This study provides an evidence that thoracic volume measurement can be used to infer the pulmonary function for spine deformity patients with moderate to severe scoliosis Cobb angle. Based on the calculation of the thoracic volumes in scoliosis patients, we correlate the parameters in the pulmonary function test to the measured thoracic volume through our software. The findings show the strong correlation between total lung capacity and the thoracic volume, and a significant correlation between the vital capacity/residual volume and the thoracic volume. An interpretation of the findings, limitation, and the future application are pointed out.

Copyright © 2019 by ASME
Topics: Scoliosis , Lung , X-rays
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Fig. 1

Illustration of the parameters in the PFT (adapted from Ref. [3])

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Fig. 2

Thoracic volume boundary of the spine patient on the frontal and lateral X-rays

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Fig. 3

Three-dimensional reconstruction process of the rib cage (left) and thoracic volume (right) for spine patient with physical bracing in the Blender environment

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Fig. 4

Correlation between TLC and thoracic volume

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Fig. 5

Correlation between VC and thoracic volume

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Fig. 6

Correlation between RV and thoracic volume



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