Femoral Neck Fracture after Removal of the Compression Hip Screw: A Case Report

Purpose: A series models of surgical internal fixation for femoral neck fracture of Pauwels II will be constructed by an innovative approach of finite element so as to determine the most stable fixation by comparison of their biomechanical performance. Method: Seventeen specimens of proximal femurs scanned by computed tomography in Digital Imaging and Communications in Medicine (DICOM) format were input onto Mimics rebuilding 3D models; their stereolithography (STL) format dataset were imported into Geomagic Studio (3D Systems, Rock Hill, South Carolina) for simulative osteotomy and non-uniform rational basis spline kartograph; the generated IGS dataset were interacted by UG to fit simulative 3D-solid models; 3 sorts of internal fixators were expressed in 3D model by ProE (PTC, Boston, Connecticut) program virtually. Processed by HyperMesh (Altair, Troy, Michigan), all compartments (fracture model + internal immobilization) were assembled onto 3 systems actually as: Dynamic hip screw (DHS) / Lag screw (LS) / DHS+LS. Eventually, a numerical model of finite elemental analysis was exported to ANSYS for solution. Result: Three models of internal fixations for femoral neck fracture of Pauwels II were established and validated effectively, the stress and displacement of each internal pin were analyzed, the advantages of each surgical therapy for femoral neck fracture of Pauwels II were compared and demonstrated synthetically as: “The contact stress of 3-LS-system was checked to be the least; the interfragmentary displacement of DHS+1-LS assemblages was assessed to be the least.” Conclusion: 3-LS-system is recommended to be a clinical optimization for Pauwels II femoral neck facture, by this therapeutic fixation mechanically, breakage of fixators, or secondary fracture rarely occurs.

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Bilateral Femoral Neck Fracture due to Electric Shock

The Journal of Medical Sciences ◽

10.5005/jp-journals-10045-0027 ◽

2016 ◽

Vol 2 (1) ◽

pp. 18-20

Author(s):

Rahul Peswani ◽

BL Chandrakar ◽

Rakesh Thakkar

Keyword(s):

Case Report ◽

Femoral Neck ◽

Femoral Neck Fracture ◽

Direct Current ◽

Electric Shock ◽

Bone Disease ◽

Late Presentation ◽

The Other ◽

Pathological Conditions ◽

Neck Fracture

ABSTRACT Simultaneous bilateral fractures of the femoral neck are rare injuries in patients without underlying pathological conditions. We report a case of a 50-year-old male, who sustained bilateral femoral neck injury resulting from electric shock with 440 V of direct current. Bilateral femoral neck fracture is rare. Bilateral femoral neck fracture due to electric shock is even rarer. This case report highlights bilateral femoral neck fracture without primary and secondary bone disease. Late presentation and unclassified pattern of fracture are the other features. How to cite this article Peswani R, Chandrakar BL, Thakkar R. Bilateral Femoral Neck Fracture due to Electric Shock. J Med Sci 2016;2(1):18-20.

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A Case Report of Femoral Neck Fracture in an Elderly Patient Managed by Non-operative Korean Medical Treatment : 42 Months Follow-up

Journal of Acupuncture Research ◽

10.13045/jar.2018.00290 ◽

2018 ◽

Vol 35 (4) ◽

pp. 252-258 ◽

Cited By ~ 1

Author(s):

Ju-ran Kim ◽

Han Mi Gong ◽

Seungah Jun ◽

Jung Hee Lee ◽

Bong Hyo Lee ◽

...

Keyword(s):

Elderly Patient ◽

Case Report ◽

Femoral Neck ◽

Medical Treatment ◽

Femoral Neck Fracture ◽

Neck Fracture

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Modified F Configuration in the Treatment of Pauwels Type III Femoral Neck Fracture: a Finite Element Analysis

10.21203/rs.3.rs-135954/v1 ◽

2021 ◽

Author(s):

Shiyuan Lin ◽

Huizi Li ◽

Kai Tong ◽

Zihang Feng ◽

Gang Wang ◽

...

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Femoral Neck ◽

Femoral Neck Fracture ◽

Femoral Neck Fractures ◽

Cannulated Screw ◽

Type Iii ◽

Neck Fracture ◽

Maximum Crack ◽

Hip Screw

Abstract Background: The optimal treatment of Pauwels type III femoral neck fracture in young patients remains a worldwide challenge in orthopedic surgery. Methods: Finite element models of four internal fixations were developed to treat Pauwels type III Femoral neck fracture: a: the traditional inverted triangular cannulated screw model, b: the F-technique cannulated screw model, c: the modified F-technique cannulated screw model using a fully threaded screw instead of a partially threaded distally, d: the dynamic hip screw coupled with anti-rotational screw model. Under the same conditions, finite element analyses were carried out to compare the displacement and von Mises stress distribution of four internal fixations and femurs, the maximum crack distances of the fracture surfaces, Z axis displacements of four models as well as the stress distribution in the subtrochanteric region. Results: The modified F-technique configuration resulted in a more stable fixation as compared to the other three approaches, with respect to the maximum displacement and stress peaks of femur and internal fixations, the maximum crack distances of the fracture surfaces, Z axis displacements of four configurations as well as the stress distribution in the subtrochanteric region.Conclusions: Our results suggested that modified F-technique configuration show a better performance in resisting shearing and rotational forces in treating Pauwels type III femoral neck fractures compared to those using traditional inverted triangular, the F-technique configuration or dynamic hip screw coupled with anti-rotational screw, providing a new choice for the treatment of femoral neck fractures.

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