Corrigendum to “Development of a Patient-Specific Finite Element Model for Predicting Implant Failure in Pelvic Ring Fracture Fixation”

Introduction. The main purpose of this study is to develop an efficient technique for generating FE models of pelvic ring fractures that is capable of predicting possible failure regions of osteosynthesis with acceptable accuracy. Methods. Patient-specific FE models of two patients with osteoporotic pelvic fractures were generated. A validated FE model of an uninjured pelvis from our previous study was used as a master model. Then, fracture morphologies and implant positions defined by a trauma surgeon in the preoperative CT were manually introduced as 3D splines to the master model. Four loading cases were used as boundary conditions. Regions of high stresses in the models were compared with actual locations of implant breakages and loosening identified from follow-up X-rays. Results. Model predictions and the actual clinical outcomes matched well. For Patient A, zones of increased tension and maximum stress coincided well with the actual locations of implant loosening. For Patient B, the model predicted accurately the loosening of the implant in the anterior region. Conclusion. Since a significant reduction in time and labour was achieved in our mesh generation technique, it can be considered as a viable option to be implemented as a part of the clinical routine to aid presurgical planning and postsurgical management of pelvic ring fracture patients.

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A patient-specific, finite element model for noncommunicating hydrocephalus capable of large deformation

Journal of Biomechanics ◽

10.1016/j.jbiomech.2013.03.008 ◽

2013 ◽

Vol 46 (8) ◽

pp. 1447-1453 ◽

Cited By ~ 12

Author(s):

Joel A. Lefever ◽

José Jaime García ◽

Joshua H. Smith

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Large Deformation ◽

Element Model ◽

Patient Specific ◽

Noncommunicating Hydrocephalus

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Finite element and biomechanical analysis of risk factors for implant failure during tension band plating

Journal of International Medical Research ◽

10.1177/0300060520972075 ◽

2020 ◽

Vol 48 (11) ◽

pp. 030006052097207

Author(s):

Jing Ding ◽

Fei Wang ◽

Fangchun Jin ◽

Zhen-kai Wu ◽

Pin-quan Shen

Keyword(s):

Residual Stress ◽

Finite Element ◽

Finite Element Model ◽

Three Dimensional ◽

Biomechanical Model ◽

Element Model ◽

Tension Band ◽

Biomechanical Analysis ◽

Implant Failure ◽

Element Analysis

Objective Tension band plating has recently gained widespread acceptance as a method of correcting angular limb deformities in skeletally immature patients. We examined the role of biomechanics in procedural failure and devised a new method of reducing the rate of implant failure. Methods In the biomechanical model, afterload (static or cyclic) was applied to each specimen. The residual stress of the screw combined with different screw sizes and configurations were measured and compared by X-ray diffraction. With regard to static load and similar conditions, the stress distribution was analyzed according to a three-dimensional finite element model. Results The residual stress was close to zero in the static tension group, whereas it was very high in the cyclic load group. The residual stress of screws was significantly lower in the convergent group and parallel group than in the divergent group. The finite element model showed similar results. Conclusions In both the finite element analysis and biomechanical tests, the maximum stress of the screw was concentrated at the position where the screws enter the cortex. Cyclic loading is the primary cause of implant failure.

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