Abstract
Background
We describe a novel computational method for assessing the fit of an osteochondral graft. We applied our software to five normal wrist computed tomography (CT) scans to determine the fit of the scaphoid to the lunate fossa of the distal radius.
Methods
CT scans of five wrists were digitally rendered. The capitate facet of the scaphoid was fit to the lunate fossa of the distal radius using custom software based on the iterative closest point (ICP) algorithm. This approach iteratively determines the optimal position of a model surface to minimize the sum of squares of distances from all points on a target surface. The fit of the two surfaces was reported by calculating the mean residual distance (MRD) between each point on one surface and its nearest neighbor on the other.
Results
The MRD for the five subjects was found to be 0.25 mm, with 82.8–98.3 % of the articular surfaces within 0.5 mm of each other.
Conclusions
We have developed a software algorithm for comparing two articular surfaces to test fit for a proposed joint reconstruction. The software is versatile and may be applied to any bony surface to identify new graft donor sites. The fit assessment renders a richer, three-dimensional understanding of the fit of the graft as compared to traditional two-dimensional assessments.
Level of Evidence: Decision analysis, Level V
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Conflict of Interest
Kathleen M. Kollitz declares no other conflict of interest.
Jennifer W. Hsu declares no other conflict of interest.
Jerry I. Huang declares the following: consultant for Arthrex, Inc., for education and product development; grants from Arthrex, Inc., for fellowship education; honoraria from AO North America as course faculty; payment for service on speakers’ bureau for Auxilium; travel and accommodation expense from Arthrex and Auxilium.
Peter R. Cavanagh declares no conflict of interest.
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No human or animals subjects were used in the above study.
Statement of Informed Consent
No identifiable patient data were used in this study. All data were collected with approval of the institutional review board.
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No grants or support was received for this study.
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Kollitz, K.M., Huang, J.I., Hsu, J.W. et al. A novel computational method for evaluating osteochondral autografts in distal radius reconstruction. HAND 10, 492–496 (2015). https://doi.org/10.1007/s11552-014-9654-6
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DOI: https://doi.org/10.1007/s11552-014-9654-6