scholarly journals A Biomechanical Study Comparing Helical Blade with Screw Design for Sliding Hip Fixations of Unstable Intertrochanteric Fractures

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Qiang Luo ◽  
Grace Yuen ◽  
Tak-Wing Lau ◽  
Kelvin Yeung ◽  
Frankie Leung
Keyword(s):  
Intertrochanteric Fracture ◽  
Biomechanical Properties ◽  
Biomechanical Study ◽  
Mechanical Compression ◽  
Rotational Displacement ◽  
Screw Design ◽  
Cutting Out ◽  
Helical Blade ◽  
Hip Screw ◽  
Posterior Position

Dynamic hip screw (DHS) is a well-established conventional implant for treating intertrochanteric fracture. However, revision surgery sometimes still occurs due to the cutting out of implants. A helical blade instead of threaded screw (DHS blade) was designed to improve the fixation power of the osteoporotic intertrochanteric fracture. In this study, the biomechanical properties of DHS blade compared to the conventional DHS were evaluated using an unstable AO/OTA 31-A2 intertrochanteric fracture model. Fifty synthetic proximal femoral bone models with such configuration were fixed with DHS and DHS blade in five different positions: centre-centre (CC), superior-centre (SC), inferior-center (IC), centre-anterior (CA), and centre-posterior (CP). All models had undergone mechanical compression test, and the vertical and rotational displacements were recorded. The results showed that DHS blade had less vertical or rotational displacement than the conventional DHS in CC, CA, and IC positions. The greatest vertical and rotational displacements were found at CP position in both groups. Overall speaking, DHS blade was superior in resisting vertical or rotational displacement in comparison to conventional DHS, and the centre-posterior position had the poorest performance in both groups.

scholarly journals Conventional versus helical blade screw insertion following the removal of the femoral head screw: a biomechanical evaluation using trochanteric gamma 3 locking nail versus PFN antirotation

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Hong Man Cho ◽  
Kwang Min Park ◽  
Tae Gon Jung ◽  
Ji Yeon Park ◽  
Young Lee
Keyword(s):  
Experimental Models ◽  
Biomechanical Study ◽  
Original Model ◽  
Screw Insertion ◽  
Rotational Strength ◽  
Helical Blade ◽  
Locking Nail ◽  
Biomechanical Evaluation ◽  
Hip Screw ◽  
Rotational Strengths

Abstract Objective When a hip screw needs to be changed, choosing between the conventional (C-type) and helical blade (H-type) types is difficult. In this biomechanical study, we compared these two screw types relative to the type of the initial screw used. Methods C- or H-type screws were inserted (leading screw) in three types of polyurethane bone models (Sawbone, Pacific Research Laboratories, Inc., Washington, USA: 130 × 180 × 40 mm) of different bone mineral densities (pounds per cubic feet [PCF] 5, 80 kg/m3; PCF 10, 160 kg/m3; and PCF 15, 240 kg/m3), and then successively or alternately inserted (following screw) after the leading screw removal. An original model (original C and H) of a leading screw without removal was created as a control. The strengths of resistance to pullout (PO) and rotational stress were measured. For each experimental condition, there were 30 experimental models. Results The original C screw was superior in PO strength, and the original H-type screw was superior in rotational strength. When the C- or H-type screw was the leading screw, using the C-type screw again as the following screw (C1-C2, H1-C2) showed the greatest resistance to PO, and using the H-type screw as the following screw (C1-H2, H1-H2) showed superior resistance to rotational strength. However, the rotational strength of the C2 screw decreased by more than 50% compared with that of the original C screw. Moreover, the PO and rotational strengths of the H2 screw decreased to less than 30% overall compared with those of the original H screw. Conclusion The H-type screw should be used for second-time screw insertion procedures in cases where it is difficult to choose between PO and rotational strengths.

A COMPARATIVE BIOMECHANICAL STUDY OF THE LOOPED SQUARE SLIP KNOT AND THE SIMPLE SURGICAL KNOT

Hand Surgery ◽  
2006 ◽  
Vol 11 (01n02) ◽  
pp. 93-99 ◽  
Author(s):  
Surut Jianmongkol ◽  
Geoffrey Hooper ◽  
Weerachai Kowsuwon ◽  
Tala Thammaroj
Keyword(s):  
Ultimate Strength ◽  
Hand Surgery ◽  
Biomechanical Properties ◽  
Biomechanical Study ◽  
Skin Closure ◽  
Significant Difference ◽  
Mode Of Failure ◽  
Repetitive Loading ◽  
Slip Knot

The looped square slip knot was introduced as a technique for skin closure to avoid the use of sharp instruments in suture removal after hand surgery. We compared the biomechanical properties of this knot with the simple surgical square knot. The ultimate strength of the looped square slip knot was significantly (p = 0.015) higher than the simple surgical knot. There was no significant difference between the two knots in mode of failure. Knot slippage or suture breakage did not occur in any samples when testing security by repetitive loading. Therefore, the looped square slip knot is a safe and convenient alternative to the two-throw surgical knot for use in hand surgery.

Common Modes of Fixation Failure with a Sliding Hip Screw encountered Unstable Intertrochanteric Fracture

2003 ◽  
Vol 16 (1) ◽  
pp. 15 ◽  
Author(s):  
Byung Soon Kim ◽  
Duck Yun Cho ◽  
Hyung Ku Yoon ◽  
Dong Eun Sin ◽  
Soo Hong Han ◽  
...  
Keyword(s):  
Intertrochanteric Fracture ◽  
Sliding Hip Screw ◽  
Fixation Failure ◽  
Unstable Intertrochanteric Fracture ◽  
Hip Screw

Perioperative Blood Loss in Intramedullary Hip Screw for Intertrochanteric Fracture: Analysis of Risk Factors

2015 ◽  
Vol 28 (1) ◽  
pp. 53
Author(s):  
Jai Hyung Park ◽  
Hwa Jae Jung ◽  
Hun Kyu Shin ◽  
Eugene Kim ◽  
Se-Jin Park ◽  
...  
Keyword(s):  
Risk Factors ◽  
Blood Loss ◽  
Intertrochanteric Fracture ◽  
Fracture Analysis ◽  
Perioperative Blood Loss ◽  
Hip Screw

scholarly journals A study to assess proximal femoral nailing versus dynamic hip screw device in surgical management of intertrochanteric fractures: a comparative study

2018 ◽  
Vol 5 (1) ◽  
pp. 23
Author(s):  
E. S. Radhe Shyam ◽  
K. Ashwin
Keyword(s):  
Functional Outcome ◽  
Intertrochanteric Fracture ◽  
Trochanteric Fracture ◽  
Dynamic Hip Screw ◽  
Proximal Femoral Nail ◽  
Technical Failure ◽  
Intertrochanteric Fractures ◽  
Femoral Nail ◽  
Fracture Management ◽  
Hip Screw

<p class="abstract"><strong>Background:</strong> The incidence of inter trochanteric fracture is expected to have doubled by 2040. Inter trochanteric fractures account for about 45% to 50% of all hip fractures in the elderly populationand out of these, near about 50% to 60% are classified as unstable intertrochanteric fractures. The goal of treatment is restoring mobility safely and efficiently, while minimizing the risk of medical complications and technical failure. This study as performed<strong> </strong>to assess functional outcome with dynamic hip screw and proximal femoral nail in intertrochanteric fracture management.</p><p class="abstract"><strong>Methods:</strong> It was prospective observational study done for a period of 1year from January 2016-January 2017 among patients who attended OPD or emergency department with intertrochanteric fracture. Two different implants were used dynamic hip screw (DHS) and proximal femoral nail (PFN).<strong></strong></p><p class="abstract"><strong>Results:</strong> Excellent results in functional outcome was more in case of PFN (66.6%) compared to DHS (50%). The type of trauma in DHS group was road traffic accident in 38.8%, domestic fall in 50% and others such as assault was in 11.1% while in PFN group intertrochanteric fracture was seen in 61.1% due to domestic fall.</p><p class="abstract"><strong>Conclusions:</strong> The functional outcome was more better with proximal femoral nail (PFN) compared to dynamic hip screw (DHS). Therefore, proximal femoral nail (PFN) should be preferred for management of intertrochanteric fractures.</p>

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