Traditional and bionic dynamic hip screw fixation for the treatment of intertrochanteric fracture: a finite element analysis

2020 ◽  
Vol 44 (3) ◽  
pp. 551-559
Author(s):  
Yunwei Cun ◽  
Chenhou Dou ◽  
Siyu Tian ◽  
Ming Li ◽  
Yanbin Zhu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Intertrochanteric Fracture ◽  
Screw Fixation ◽  
Dynamic Hip Screw ◽  
Element Analysis ◽  
Hip Screw

BIOMECHANICAL EFFECT OF DIFFERENT LAG SCREW LENGTHS WITH DIFFERENT BARREL LENGTHS IN DYNAMIC HIP SCREW SYSTEM: A FINITE ELEMENT ANALYSIS STUDY

2017 ◽  
Vol 17 (01) ◽  
pp. 1750008 ◽  
Author(s):  
CHUNG-YUH TZENG ◽  
KUI-CHUO HUANG ◽  
YUN-CHE WU ◽  
CHU-LING CHANG ◽  
KUAN-RONG LEE ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Intertrochanteric Fracture ◽  
High Stress ◽  
Dynamic Hip Screw ◽  
Element Analysis ◽  
Side Plate ◽  
Lag Screw ◽  
Hip Screw ◽  
Biomechanical Effect

The dynamic hip screw (DHS) system is commonly used to treat intertrochanteric fracture of the hip joint. Breakage of the lag screw was noted in clinical practice and the length of lag screw as well as the length of the side plate in the DHS system appeared to play a role in the risk of breakage. Thus, the aim of this study was to investigate the biomechanical effect of different lag screw lengths and barrel plate lengths in the DHS implant system by finite element analysis (FEA). Four FEA simulation models were created according to different lengths of lag screw (79[Formula: see text]mm and 63[Formula: see text]mm) and different lengths of barrel side plate (43[Formula: see text]mm and 37[Formula: see text]mm). The von Mises stress was used as the observation indicator. The results showed that the maximum tensile stress on the long lag screw was slightly greater than that of the shorter lag screw. Use of a shorter barrel side plate may also cause high stress between the lag screw and the barrel side plate. This finding provides biomechanical reference data that may be of value to orthopedic surgeons with respect to choice of implant size and length in the treatment of intertrochanteric fracture with a DHS system to prevent complications such as implant failure caused by broken lag screws.

scholarly journals Design of Improved Intertrochanteric Fracture Treatment (DRIFT) Study: Protocol for Biomechanical Testing and Finite Element Analysis of Stable and Unstable Intertrochanteric Fractures Treated With Intramedullary Nailing or Dynamic Compression Screw (Preprint)

2019 ◽  
Author(s):  
Andreas Panagopoulos ◽  
Georgios Kyriakopoulos ◽  
Georgios Anastopoulos ◽  
Panagiotis Megas ◽  
Stavros K Kourkoulis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computer Aided Design ◽  
Intertrochanteric Fracture ◽  
Mechanical Failure ◽  
Fracture Treatment ◽  
Element Analysis ◽  
Computer Aided ◽  
Hip Screw ◽  
Aided Design

BACKGROUND Intertrochanteric hip fractures rank in the top 10 of all impairments worldwide in terms of loss in disability-adjusted years for people aged older than 60 years. The type of surgery is usually carried out with dynamic hip screw (DHS) devices or cephalomedullary nails (CMN). Cut-out of the hip screw is considered the most frequent mechanical failure for all implants with an estimated incidence ranging from 2% to 16.5%; this entails both enhancing our understanding of the prognostic factors of cut-out and improving all aspects of intertrochanteric fracture treatment. OBJECTIVE The Design of Improved Intertrochanteric Fracture Treatment (DRIFT) study’s main objective is to provide intertrochanteric fracture treatment expertise, requirements and specifications, clinical relevance, and validation to improve treatment outcomes by developing a universal algorithm for designing patient- and fracture-oriented treatment. The hypothesis to be tested is that a more valgus reduction angle and implants of higher angles will lead to a more favorable biomechanical environment for fracture healing—that is, higher compressive loads at the fracture site with lower shear loads at the hip screw femoral head interface. A new implant with enhanced biomechanical and technical characteristics will be designed and fabricated; in addition, an integrated design and optimization platform based on computer-aided design tools and topology optimization modules will be developed. METHODS To test this hypothesis, a biomechanical study comprising experimental loading of synthetic femora (Sawbones Inc) and finite element analysis (FEA) will be conducted. Detailed FEA of existing implants (DHS and CMN) implemented in different clinical cases under walking conditions will be performed to derive the stress and strain fields developed at the implant-bone system and identify critical scenarios that could lead to failure of therapy. These models would be validated against instrumented mechanical tests using strain gages and a digital image correlation process. RESULTS After testing, geometric drawbacks of existing implants will be fully recognized, and geometric characteristics will be correlated with critical failure scenarios. The last step would be the numeric design, computer-aided design (using FEA codes and design packages), and optimization of the new proposed implant with regard to improved biomechanical surgical technique and enhanced mechanical performance that will reduce the possibility for critical failure scenarios. CONCLUSIONS The optimization of the biomechanical behavior of the fracture-osteosynthesis model by the application of the ideal reduction angle and implant is expected to have a positive effect to the rate of mechanical failure and, subsequently, the healing rates, morbidity, and mortality in this fragile patient group. INTERNATIONAL REGISTERED REPOR DERR1-10.2196/12845

New fixation method for Pauwels type III femoral neck fracture: a finite element analysis of sliding hip screw, L-shaped, and L-shaped with medial plate

2021 ◽  
Author(s):  
Anderson Freitas ◽  
Ricardo Lourenço Bontempo ◽  
Frank Anderson Ramos Azevedo ◽  
Leonardo Rigobello Battaglion ◽  
Marcos Noberto Giordano ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
Fixation Method ◽  
Sliding Hip Screw ◽  
Element Analysis ◽  
Type Iii ◽  
Neck Fracture ◽  
Hip Screw

scholarly journals Treatment of Thoracolumbar Fractures Through Different Short Segment Pedicle Screw Fixation Techniques: A Finite Element Analysis

2020 ◽  
Vol 12 (2) ◽  
pp. 601-608
Author(s):  
Tie‐nan Wang ◽  
Bao‐lin Wu ◽  
Rui‐meng Duan ◽  
Ya‐shuai Yuan ◽  
Ming‐jia Qu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Thoracolumbar Fractures ◽  
Short Segment ◽  
Element Analysis ◽  
Fixation Techniques
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