Material properties are related to stress fracture callus and porosity of cortical bone tissue at affected and unaffected sites
Corresponding Author
Rachel C. Entwistle
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616. T: 530-754-6979; F: 530-754-0150.Search for more papers by this authorSara C. Sammons
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
Search for more papers by this authorRobert F. Bigley
Orthopedic Research Laboratories, School of Medicine, University of California at Davis, Sacramento, California
Search for more papers by this authorScott J. Hazelwood
Biomedical and General Engineering Department, California Polytechnic State University, San Luis Obispbo, California
Search for more papers by this authorDavid P. Fyhrie
Orthopedic Research Laboratories, School of Medicine, University of California at Davis, Sacramento, California
Search for more papers by this authorJeffery C. Gibeling
Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California
Search for more papers by this authorSusan M. Stover
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
Search for more papers by this authorCorresponding Author
Rachel C. Entwistle
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616. T: 530-754-6979; F: 530-754-0150.Search for more papers by this authorSara C. Sammons
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
Search for more papers by this authorRobert F. Bigley
Orthopedic Research Laboratories, School of Medicine, University of California at Davis, Sacramento, California
Search for more papers by this authorScott J. Hazelwood
Biomedical and General Engineering Department, California Polytechnic State University, San Luis Obispbo, California
Search for more papers by this authorDavid P. Fyhrie
Orthopedic Research Laboratories, School of Medicine, University of California at Davis, Sacramento, California
Search for more papers by this authorJeffery C. Gibeling
Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California
Search for more papers by this authorSusan M. Stover
J.D. Wheat Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, Stover Lab, University of California–Davis, 1285 Veterinary Drive, Bldg VM3A, Rm 4206, Davis, California 95616
Search for more papers by this authorAbstract
Stress fractures are overuse injuries of bone that affect elite athletes and military recruits. One response of cortical bone to stress fracture is to lay down periosteal callus. The objectives of this study were to determine if material properties are different among bones with different stages of stress fracture callus, at both a callus site and at a distal site. Cortical specimens were mechanically tested to determine their stress–strain response. Material property differences were examined using nonparametric and regression analyses. At the callus site, material properties were low during the earliest stages of callus, higher with increasing callus maturity, but dropped at the late stage of callus. At the distal site, the material properties were low during early stages of callus and approached, or returned to, those of bones without callus during the late stages of callus. The effects of stress fracture and bone callus are not limited to the focal site of stress fracture. © 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:1272–1279, 2009
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