Accuracy of specimen-specific nonlinear finite element analysis for evaluation of radial diaphysis strength in cadaver material.
The feasibility of a user-specific finite element model for predicting the in situ strength of the radius after implantation of bone plates for open fracture reduction was established. The effect of metal artifact in CT imaging was characterized. The results were verified against biomechanical test data. Fourteen cadaveric radii were divided into two groups: (1) intact radii for evaluating the accuracy of radial diaphysis strength predictions with finite element analysis and (2) radii with a locking plate affixed for evaluating metal artifact. All bones were imaged with CT. In the plated group, radii were first imaged with the plates affixed (for simulating digital plate removal). They were then subsequently imaged with the locking plates and screws removed (actual plate removal). Fracture strength of the radius diaphysis under axial compression was predicted with a three-dimensional, specimen-specific, nonlinear finite element analysis for both the intact and plated bones (bones with and without the plate captured in the scan). Specimens were then loaded to failure using a universal testing machine to verify the actual fracture load. In the intact group, the physical and predicted fracture loads were strongly correlated. For radii with plates affixed, the physical and predicted (simulated plate removal and actual plate removal) fracture loads were strongly correlated. This study demonstrates that our specimen-specific finite element analysis can accurately predict the strength of the radial diaphysis. The metal artifact from CT imaging was shown to produce an overestimate of strength.
a Department of Orthopeadic Surgery , Graduate School of Medicine, Chiba University , 1-8-1 Inohana, Chuo-ku , Chiba 260-8670 , Japan.
Yusuke
Y
Matsuura
Kazuki
K
Kuniyoshi
Takane
T
Suzuki
Yasufumi
Y
Ogawa
Koji
K
Sukegawa
Tomoyuki
T
Rokkaku
Andrew Ryan
AR
Thoreson
Kai-Nan
KN
An
Kazuhisa
K
Takahashi
D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D001696:Biomechanical Phenomena; D015519:Bone Density; D002102:Cadaver; D003198:Computer Simulation; D018483:Diaphyses / Q000503:physiopathology*; D005260:Female; D020342:Finite Element Analysis; D006801:Humans; D008297:Male; D008670:Metals; D017711:Nonlinear Dynamics; D011884:Radius / Q000503:physiopathology*; D011885:Radius Fractures / Q000503:physiopathology; D012044:Regression Analysis; D016474:Weight-Bearing
D008670:Metals
bone strength; finite element model; forearm fracture; metal artifact