Finite Element Analysis of Dynamic Hip Screw for Intertrochanteric Fracture

Rooppakhun, Supakit; Siamuna, Kasem

doi:10.7763/ijmo.2012.v2.103

Cited by 4 publications

(7 citation statements)

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“…The geometric models of the implants were obtained using a coordinate measuring machine and Solid Works 2011 (Dassault Systèmes). The cortex screw threads were replaced by a smooth surface for simplicity, the size of which corresponds to the mean diameter of the thread [ 25 , 26 ]. In order to prepare the geometric models, the intact bone models were segmented, the fractures were reduced, and the implants were positioned (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…For FEA, all geometric models were imported into ABAQUS V.6.10 (Dassault Systèmes). Stainless steel, the main material constituent of all three implants, was modeled as a homogeneous isotropic and elastic material, with an elastic modulus of E = 200 GPa and a Poisson’s ratio of μ = 0.3 [ 26 , 27 ]. In all models, the bone tissue was assumed to be homogeneous, isotropic, and elastic.…”

Section: Methodsmentioning

confidence: 99%

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Comparison of Three Fixation Methods for Femoral Neck Fracture in Young Adults: Experimental and Numerical Investigations

et al. 2015

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Femoral neck fractures in young patients are usually caused by a high-energy trauma, which results in a perpendicular fracture. Although efforts are focused on preserving the femoral head in young patients, vertical femoral neck fracture is a problematic orthopedic injury due to the domination of shear forces. Due to controversy regarding which fixation method is the best choice, the purpose of this study was to find the most stable fixation method for this kind of fracture. This study includes experimental testing on cadaveric bone samples and finite element analysis (FEA) for three fracture fixation techniques, namely cannulated screws (CSs), dynamic hip screw with derotational screw (DHS + DS), and proximal femoral locking plate (PFLP). Experimental results of bone-implant stiffness, average femoral head displacement, failure load, failure energy, and relative position of the fractured fragments indicate that DHS + DS offers the strongest structure for stabilizing a vertical femoral neck fracture. Experimental data and FEA results both indicate that under static loading, the DHS + DS method of fixation produces the lowest femoral head displacement and interfragmentary movement, followed by PFLP and then CSs. The results of this research suggest that, based on the clinical assumption that a restricted weight-bearing regimen is recommended in the postoperative rehabilitation protocol, the DHS + DS method of fixation is a better choice compared to CSs and PFLP for a vertical femoral neck fracture fixation in young adults.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Comparison of Three Fixation Methods for Femoral Neck Fracture in Young Adults: Experimental and Numerical Investigations

et al. 2015

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“…The main material constituent of all three implants, stainless steel, was modeled as a homogeneous, isotropic, and linear elastic material, with an elastic modulus of E = 200 GPa and Poisson’s ratio of υ = 0.3. 8,32,33 In all models, the proximal femur was modeled as an elastic, isotropic, and non-homogeneous material. In comparison with our previous study, 8 the novelty of this work was to take into account and simulate a non-homogeneous bone mass distribution in the proximal femur FE model in order to provide a more realistic assessment of the mechanical behavior of the bone-implant constructs during the bone healing process.…”

Section: Methodsmentioning

confidence: 99%

Stability of femoral neck fracture fixation: A finite element analysis

Samsami

Augat

Rouhi

2019

Proc Inst Mech Eng H

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Femoral neck fractures represent a relatively uncommon injury in the non-elderly population often resulting from high-energy trauma. Clinical outcome in these patients can be improved by optimizing surgical procedures and selecting appropriate fixation methods. The aim of this study was to develop a numerical fracture model to investigate the influence of critical mechanical factors on the stability of fixation methods for femoral neck fractures. The mechanical stability of fracture fixation was assessed through employing finite element models and simulating progressive consolidation of the fracture for a vertical femoral neck fracture (i.e. Pauwels type III in which the angle between the fracture line and the horizontal plane is greater than 70°). Mechanical performance was compared among three different fixation methods (cannulated screws, dynamic hip screw with de-rotational screw, and proximal femoral locking plate). Axial femoral head displacement varied from 2.3 mm for cannulated screws to 1.12 mm for proximal femoral locking plate, although dynamic hip screw with de-rotational screw indicated a value of 0.94 mm. Considering a consolidated fracture and full weight-bearing load case, average displacements of fracture fragments were obtained of about 1.5, 3 and 70 µm for dynamic hip screw with de-rotational screw, proximal femoral locking plate and cannulated screws methods, respectively. In terms of interfragmentary movements at the fracture site, outcomes of this study demonstrated that, in agreement with our previous experimental research, the dynamic hip screw with de-rotational screw implant is a more effective choice than cannulated screws and proximal femoral locking plate techniques for vertical femoral neck fractures in young patients. Thus, one may conclude that the use of dynamic hip screw with de-rotational screw, particularly during the early stages of bone healing, could provide suitable mechanical environments that facilitate direct bone formation and shorter healing times.

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“…Daha uzun bir yan plaka kemikleri kavramak için daha fazla vida sağlayabilir, ancak bu daha uzun bir yara ve daha yumuşak doku tahribatına neden olur. Birçok çalışma farklı yan plaka uzunluklarının klinik gözlemlerle etkilerini araştırmış olmasına rağmen, [13][14][15][16][17], araştırmalar için biyomekaniği az sayıda çalışma kullanılmıştır [18][19]. Bu nedenle, ortopedi cerrahlarının, hastaları için uygun uzunluktaki yan plakaları seçmek için biyomekanik bir analize ihtiyacı vardır, bu da ameliyat sonrası komplikasyonları azaltabilir.…”

Section: Introductionunclassified

“…Önceki çalışmalarda, 4 delikli yan plakaların tedavi için ortak seçimler olduğu belirtilmiştir, ancak bazı araştırmacılar 2 delikli yan plakaların biyomekanik analiz ve klinik uygulamada yeterli stabilite sağladığını düşünmüşlerdir [13][14][15][16][17][18][19]. McLoughlin vd.…”

Section: Introductionunclassified

Farklı uzunluklarda dinamik kalça vidası yan plakaları ile intertrakkanterik kalça kırığı tedavisinin biyomekanik analizi

Kayabaşı

2019

International Journal of Advances in Engineering and Pure Sciences

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Dinamik kalça vidası (DKV), stabil tip intertrokanterik kalça kırıklarını tedavi etmek için kullanılan yaygın bir implanttır. Cerrahinin başarısını etkileyebilecek birçok faktör vardır. Yan plakaların uzunluğu faktörlerden biridir. Bu nedenle, DKV yan plakaların uzunluklarının biyomekaniğini araştırmak önemlidir. İmplant başarısızlıklarını azaltmak ve farklı uzunluklarda yan plaka etkilerini anlamak için, bu çalışmanın amacı DKV'daki farklı uzunluklarda yan plakaları araştırmak için sonlu elemanlar analizini kullanmaya çalışmaktır. Bu sonlu elemanlar analizi çalışmasında intertrokanterik kalça kırıkları için, farklı uzunluklardaki DKV implantasyonunu simüle etmek için kortikal kemik, süngerimsi kemik, yan plaka, gecikme vidası için 3D model inşa edilmiştir.. Yükleme koşulu, bir süje dik dururken femur başı üzerindeki kuvveti (400N) simüle etmek için kullanılmıştır. Bu çalışmada gecikme vidası, yan plaka, kortikal vidalar ve femurdaki gerilme dağılımını araştırılmıştır. En büyük gerilme, vidaların kortikal kemiklerle temas ettiği noktaların çevresinde meydana gelmiştir. Femurdaki en distal kortikal vidadaki gerilme en fazla oluşmuştur. Yan plakanın uzunluğu kısaldıkça kortikal vidalar üzerindeki gerilme artar ve bu da kortikal vidaları çevreleyen femur üzerindeki gerilmeyi arttırır. Yan plakanın uzunluğu (2 delikli yan plaka) ve femur üzerindeki en uzak vida ile DHS kullanımı, yan plakanın dışarı çekilme riskini artırabilir. Bu çalışmanın sonuçları, ortopedik cerrahlar tarafından DKV implant uzunluklarının seçilmesi için biyomekanik bir analiz sağlayabilir.

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Finite Element Analysis of Dynamic Hip Screw for Intertrochanteric Fracture

Cited by 4 publications

References 0 publications

Comparison of Three Fixation Methods for Femoral Neck Fracture in Young Adults: Experimental and Numerical Investigations

Comparison of Three Fixation Methods for Femoral Neck Fracture in Young Adults: Experimental and Numerical Investigations

Stability of femoral neck fracture fixation: A finite element analysis

Farklı uzunluklarda dinamik kalça vidası yan plakaları ile intertrakkanterik kalça kırığı tedavisinin biyomekanik analizi

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