Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures

Li, Jiantao; Wang, Menglin; Li, Lianting; Zhang, Hao; Hao, Ming; Li, Chen; Han, Lin; Zhou, Jianfeng; Wang, Kun

doi:10.1186/s13018-018-0970-3

Cited by 43 publications

(48 citation statements)

References 24 publications

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“…The triangular con guration was favorable compared with the inverted con guration. This result is consistent with those in previous studies 32,38 showing that triangular con guration xation is slightly better than inverted con guration xation. This result can be explained by the main nail and the antirotational screw providing excellent angular support and effectively maintaining the fracture in the appropriate position.…”

Section: Discussionsupporting

confidence: 94%

Finite element analysis of a new internal fixation implant for Pauwels type III femoral neck fractures

Fan¹,

Su²,

Zhou³

et al. 2020

Preprint

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Background The optimal treatment strategy for Pauwels type III femoral neck fractures remains controversial. A new internal fixation femoral neck system (FNS) for the treatment of femoral neck fractures was developed, and we compared the mechanical efficiency of the internal fixation FNS with that of two cannulated screw configurations for the treatment of Pauwels type III femoral neck fractures. Method: In this study, we constructed models of Pauwels type III femoral neck fractures with angles of 50°, 60°, and 70°. Moreover, a fixation model with the FNS and two fixation models with cannulated screws were developed. Under two axial loads, 1400 N and 2100 N, the von Mises stress distributions, maximum von Mises stress, and displacements of the femur and internal fixation components were measured for each fracture group. Result The maximum von Mises stress of internal fixation in the three models was mostly located near the fracture line, and the femoral head region closest to the femoral calcar experienced the maximum amount of stress. As the Pauwels angle and axial loads increased, the stress and displacement of the proximal femoral head and internal fixation component increased in each group. Compared with cannulated screw configurations, the internal fixation FNS showed lower values of peak stress at the femoral head and smaller displacements of the femur and internal implant in the treatment of Pauwels type III femoral neck fractures with Pauwels angles of 50°, 60°, and 70°. Conclusion The newly developed internal fixation FNS provided improved biomechanical stability for the treatment of Pauwels type III femoral neck fractures, which indicated that the internal fixation FNS may be a new option for the treatment of vertical femoral neck fractures.

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Section: Discussionsupporting

confidence: 94%

Finite element analysis of a new internal fixation implant for Pauwels type III femoral neck fractures

Fan¹,

Su²,

Zhou³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Different from the FE model of the pelvis and entire hip joint, the region of joint reaction force as well as the weight-bearing area in such separate model with standing position needs to be defined before stress loading. Most of the related literature present to design the weight-bearing area as an ambiguous elliptical region [23,24], or load the joint force by simplifying it into a point [19,25]. This can unify load condition and quickly realize the mechanical analysis.…”

Section: Discussionmentioning

confidence: 99%

Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position

Yang

Lin

et al. 2020

J Orthop Surg Res

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Background: The positional distribution and size of the weight-bearing area of the femoral head in the standing position as well as the direct active surface of joint force can directly affect the result of finite element (FE) stress analysis. However, the division of this area was vague, imprecise, and un-individualized in most studies related to separate FE models of the femur. The purpose of this study was to quantify the positional distribution and size of the weight-bearing area of the femoral head in standing position by a set of simple methods, to realize individualized reconstruction of the proximal femur FE model. Methods: Five adult volunteers were recruited for an X-ray and CT examination in the same simulated bipedal standing position with a specialized patented device. We extracted these image data, calculated the 2D weightbearing area on the X-ray image, reconstructed the 3D model of the proximal femur based on CT data, and registered them to realize the 2D weight-bearing area to 3D transformation as the quantified weight-bearing surface. One of the 3D models of the proximal femur was randomly selected for finite element analysis (FEA), and we defined three different loading surfaces and compared their FEA results. Results: A total of 10 weight-bearing surfaces in 5 volunteers were constructed, and they were mainly distributed on the dome and anterolateral of the femoral head with a crescent shape, in the range of 1218.63-1, 871.06 mm 2. The results of FEA showed that stress magnitude and distribution in proximal femur FE models among three different loading conditions had significant differences, and the loading case with the quantized weightbearing area was more in accordance with the physical phenomenon of the hip. Conclusion: This study confirmed an effective FE modeling method of the proximal femur, which can quantify the weight-bearing area to define a more reasonable load surface setting without increasing the actual modeling difficulty.

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“…Different from the FE model of pelvis and entire hip joint, the region of joint reaction force as well as the weight-bearing area in such separate model with standing position needs to be defined before stress loading. Most of the related literature present to design weight-bearing area as an ambiguous elliptical region [19,20], or load the joint force by simplifying it into a point [15,21]. This can unify load condition and quickly realize the mechanical analysis.…”

Section: Discussionmentioning

confidence: 99%

Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position

Yang

Lin

et al. 2020

Preprint

View full text Add to dashboard Cite

BackgroundThe positional distribution and size of the weight-bearing area of femoral head in the standing position as well as the direct active surface of joint force can directly affect the result of finite element (FE) stress analysis, however in most studies related separate FE models of femur, the division of this area is vague, imprecise and un-individualized. The purpose of this study was to quantify the positional distribution and size of the weight-bearing area of femoral head in standing position by a set of simple methods, to realize individualized reconstruction of proximal femur FE model.MethodsFive adult volunteers were recruited for X-ray and CT examination in the same simulated bipedal standing position with a specialized patented device. We extracted these image data, calculated the 2D weight-bearing area on X-ray image, reconstructed the 3D model of proximal femur based on CT data, and registered them to realize the 2D weight-bearing area to 3D transformation as the quantified weight-bearing surface. One of the 3D models of proximal femur was randomly selected for finite element analysis (FEA), and we defined three different loading surfaces, and compared their FEA results.ResultsA total of 10 weight-bearing surfaces in 5 volunteers were constructed, they were mainly distributed on the dome and anterolateral of femoral head with crescent shape, in the range of 1,218.63mm2 - 1,871.06mm2. The results of FEA showed stress magnitude and distribution in proximal femur FE models among three different loading conditions were significant differences, the loading case with quantized weight-bearing area was more in accordance with the physical phenomenon of the hip.ConclusionThis study confirmed an effective FE modeling method of proximal femur, which can quantify weight-bearing area to define more reasonable load surface setting without increasing the actual modeling difficulty.

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Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures

Cited by 43 publications

References 24 publications

Finite element analysis of a new internal fixation implant for Pauwels type III femoral neck fractures

Finite element analysis of a new internal fixation implant for Pauwels type III femoral neck fractures

Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position

Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position

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