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Scientific Articles   |    
Computed Tomography-Based Structural Analysis for Predicting Fracture Risk in Children with Benign Skeletal NeoplasmsComparison of Specificity with That of Plain Radiographs
Natalie L. Leong, BS1; Megan E. Anderson, MD2; Mark C. Gebhardt, MD2; Brian D. Snyder, MD, PhD2
1 Harvard Medical School, TMEC 213, 260 Longwood Avenue, Boston, MA 02115
2 Department of Orthopedic Surgery, Children's Hospital Boston, 300 Longwood Avenue, Fegan 2, Boston, MA 02115. E-mail address for B.D. Snyder: Brian.Snyder@childrens.harvard.edu
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Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any one year, outside funding or grants in excess of $10,000 from the Whitaker Foundation and the National Institutes of Health (R01 CA 40211-13) and less than $10,000 from the Children's Orthopedic Surgery Foundation. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the Department of Orthopedic Surgery, Children's Hospital Boston, Boston, Massachusetts

Copyright ©2010 American Society for Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2010 Aug 04;92(9):1827-1833. doi: 10.2106/JBJS.I.00871
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Abstract

Background: 

The decision whether to treat benign skeletal lesions surgically can be difficult to make. The purpose of this study was to validate our previously published method of predicting fracture risk with use of quantitative computed tomography-based structural analysis.

Methods: 

We prospectively studied a group of children who presented to a major children's hospital with a benign appendicular skeletal lesion between 2002 and 2007. As in our previous study, the resistance of the affected bone to compressive, bending, and torsional loads was calculated with rigidity analysis performed with the use of serial transaxial quantitative computed tomography data obtained along the length of the bone containing the lesion and from homologous cross sections through the contralateral, normal bone. At each cross section, the ratio of the structural rigidity of the affected bone to that of the normal, contralateral bone was determined.

Results: 

Forty-one patients who had not received surgical treatment for the skeletal lesion met the criteria for our study. Thirty-four (83%) of these individuals completed our activity questionnaire at least two years after the quantitative computed tomography-based rigidity analysis. None of the patients for whom no increased fracture risk had been predicted by the rigidity analysis sustained a fracture, even though they had not received surgical treatment.

Conclusions: 

Many considerations other than the predicted fracture risk are factored into the decision of whether to treat a benign skeletal lesion. However, this study indicated that quantitative computed tomography-based rigidity analysis is more specific (97% specificity) than criteria based on plain radiographs (12% specificity) for predicting the risk of a pathologic fracture since fracture risk indices based on lesion size alone fail to account for the compensatory remodeling of the host bone that occurs in response to the presence of the lesion in a growing child.

Level of Evidence: 

Prognostic Level I. See Instructions to Authors for a complete description of levels of evidence.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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