Stability of femoral neck osteosynthesis: Comparison of fixation methods in cadavers

Husby, Torstein; Alho, A; Rønningen, Helge

doi:10.3109/17453678909149281

Cited by 17 publications

(13 citation statements)

References 12 publications

(9 reference statements)

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“…10,11 Indeed, it has been demonstrated that in adults, 2 screws more effectively resist torsional loads across a fractured femoral neck than 1 screw. 12 Although SCFE is most likely because of a combination of several different loads, some have proposed a torsional component to the etiology of SCFE. 13,14 However, the precise meaning of the term Btorsion^as used by various authors 13,14 is not always clear.…”

Section: Discussionmentioning

confidence: 99%

Torsional Strength of Double- Versus Single-screw Fixation in a Pig Model of Unstable Slipped Capital Femoral Epiphysis

Snyder

Williams

Schmidt

et al. 2006

Journal of Pediatric Orthopaedics

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Slipped capital femoral epiphysis was produced in 9 matched pairs of fresh-frozen pig femurs (1-year-old pigs) by twisting the femoral head about the femoral neck axis. Each matched pair was fixed with a single steel cannulated screw on one side and 2 screws contralaterally, after which the perichondrium was removed before retesting. Double-screw fixation without the perichondrium provided 43% of the stiffness and 74% of the strength of the intact physis in torsion and approximately double the stiffness and strength of single-screw fixation (P<0.004). This information may be of use to the surgeon concerned about rotational stability in unstable slipped capital femoral epiphysis.

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Section: Discussionmentioning

confidence: 99%

Torsional Strength of Double- Versus Single-screw Fixation in a Pig Model of Unstable Slipped Capital Femoral Epiphysis

Snyder

Williams

Schmidt

et al. 2006

Journal of Pediatric Orthopaedics

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“…This results in the opening of the fracture, especially in the superior region, which the screws try to resist. While the movement recorded in the mechanical model is greater than that of the FE model, it is similar to other mechanical studies [16][17][18] and highlights the effectiveness of the motion capture technique as a useful tool for measuring the stability of fixated fractures.…”

Section: Discussionmentioning

confidence: 49%

“…Various test rigs have been designed to analyse the response of the proximal femur [16][17][18][19]. In the majority of these a single loading condition is simulated.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two tools for the measurement of interfragmentary movement in femoral neck fractures stabilised by cannulated screws

Nabhani¹,

Bradley²,

Hodgson³

2010

Robotics and Computer-Integrated Manufacturing

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“…Comparison of different configurations of the screws used for stabilization of femoral neck fracture has been studied in biomechanics (Baitner et al, 1999;Holmes et al, 1993;Husby et al, 1987Husby et al, , 1989Selvan et al, 2004). Reviewing the literature, it is reported in studies that the ideal configuration of screws is two screws for proximal and one for distal in inverted triangle configuration (Kyle, 2009;Ly and Swiontkowski, 2009;Melvin and Happenstall, 2009;Schmidt et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Biomechanical comparison using finite element analysis of different screw configurations in the fixation of femoral neck fractures

Gök

İnal

2015

Mech. Sci.

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Abstract. In this research, biomechanical behaviors of five different configurations of screws used for stabilization of femoral neck fracture under axial loading have been examined, and which configuration is best has been investigated. A point cloud was obtained after scanning the human femoral model with a three dimensional (3-D) scanner, and this point cloud was converted to a 3-D femoral model by Geomagic Studio software. Femoral neck fracture was modeled by SolidWorks software for five different configurations: dual parallel, triple parallel, triangle, inverted triangle and square, and computer-aided numerical analysis of different configurations were carried out by ANSYS Workbench finite element analysis (FEA) software. For each configuration, mesh process, loading status (axial), boundary conditions and material model were applied in finite element analysis software. Von Mises stress values in the upper and lower proximity of the femur and screws were calculated. According to FEA results, it was particularly advantageous to use the fixation type of triangle configuration. The lowest values are found as 223.32 MPa at the lower, 63.34 MPa at the upper proximity and 493.24 MPa at the screws in triangle configuration. This showed that this configuration creates minimum stress at the upper and lower proximity of the fracture line. Clinically, we believe that the lowest stress values which are created by triangle configuration encompass the most advantageous method. In clinical practices, it is believed that using more than three screws does not provide any benefit. Furthermore, the highest stresses are as follows: at upper proximity 394.79 MPa in triple parallel configuration, for lower proximity 651.2 MPa in square configuration and for screw 2459 MPa in inverted triangle.

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Stability of femoral neck osteosynthesis: Comparison of fixation methods in cadavers

Cited by 17 publications

References 12 publications

Torsional Strength of Double- Versus Single-screw Fixation in a Pig Model of Unstable Slipped Capital Femoral Epiphysis

Torsional Strength of Double- Versus Single-screw Fixation in a Pig Model of Unstable Slipped Capital Femoral Epiphysis

Comparison of two tools for the measurement of interfragmentary movement in femoral neck fractures stabilised by cannulated screws

Biomechanical comparison using finite element analysis of different screw configurations in the fixation of femoral neck fractures

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