Validation of statistical shape model based reconstruction of the proximal femur - A morphology study

Schumann, S; Tannast, M; Nolte, LP; Zheng, G (2010). Validation of statistical shape model based reconstruction of the proximal femur - A morphology study. Medical engineering & physics, 32(6), pp. 638-44. Amsterdam: Elsevier 10.1016/j.medengphy.2010.03.010

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Seventeen bones (sixteen cadaveric bones and one plastic bone) were used to validate a method for reconstructing a surface model of the proximal femur from 2D X-ray radiographs and a statistical shape model that was constructed from thirty training surface models. Unlike previously introduced validation studies, where surface-based distance errors were used to evaluate the reconstruction accuracy, here we propose to use errors measured based on clinically relevant morphometric parameters. For this purpose, a program was developed to robustly extract those morphometric parameters from the thirty training surface models (training population), from the seventeen surface models reconstructed from X-ray radiographs, and from the seventeen ground truth surface models obtained either by a CT-scan reconstruction method or by a laser-scan reconstruction method. A statistical analysis was then performed to classify the seventeen test bones into two categories: normal cases and outliers. This classification step depends on the measured parameters of the particular test bone. In case all parameters of a test bone were covered by the training population's parameter ranges, this bone is classified as normal bone, otherwise as outlier bone. Our experimental results showed that statistically there was no significant difference between the morphometric parameters extracted from the reconstructed surface models of the normal cases and those extracted from the reconstructed surface models of the outliers. Therefore, our statistical shape model based reconstruction technique can be used to reconstruct not only the surface model of a normal bone but also that of an outlier bone.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Schumann, Steffen; Tannast, Moritz; Nolte, Lutz-Peter and Zheng, Guoyan

ISSN:

1350-4533

Publisher:

Elsevier

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:09

Last Modified:

04 May 2014 23:04

Publisher DOI:

10.1016/j.medengphy.2010.03.010

PubMed ID:

20435501

Web of Science ID:

000279857300013

URI:

https://boris.unibe.ch/id/eprint/776 (FactScience: 200704)

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