scholarly journals A Novel Fixation System for Acetabular Quadrilateral Plate Fracture: A Comparative Biomechanical Study

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Guo-Chun Zha ◽  
Jun-Ying Sun ◽  
Sheng-Jie Dong ◽  
Wen Zhang ◽  
Zong-Ping Luo
Keyword(s):  
Plate Fixation ◽  
Biomechanical Properties ◽  
Biomechanical Study ◽  
Pelvic Brim ◽  
Quadrilateral Plate ◽  
Plate Fracture ◽  
Fixation Techniques ◽  
Biomechanical Experiment ◽  
Fixation System

This study aims to assess the biomechanical properties of a novel fixation system (named AFRIF) and to compare it with other five different fixation techniques for quadrilateral plate fractures. This in vitro biomechanical experiment has shown that the multidirectional titanium fixation (MTF) and pelvic brim long screws fixation (PBSF) provided the strongest fixation for quadrilateral plate fracture; the better biomechanical performance of the AFRIF compared with the T-shaped plate fixation (TPF), L-shaped plate fixation (LPF), and H-shaped plate fixation (HPF); AFRIF gives reasonable stability of treatment for quadrilateral plate fracture and may offer a better solution for comminuted quadrilateral plate fractures or free floating medial wall fracture and be reliable in preventing protrusion of femoral head.

scholarly journals A Biomechanical Evaluation of a Next-Generation Integrated and Modular ACDF Device Possessing Full-Plate, Half-Plate, and No-Profile Fixation Iterations

2019 ◽  
Vol 9 (8) ◽  
pp. 826-833
Author(s):  
Ripul Panchal ◽  
Anup Gandhi ◽  
Chris Ferry ◽  
Sam Farmer ◽  
Jeremy Hansmann ◽  
...  
Keyword(s):  
Plate Fixation ◽  
Testing Machine ◽  
Axial Rotation ◽  
Biomechanical Study ◽  
The Novel ◽  
Novel Device ◽  
Plate Group ◽  
Flexion Extension ◽  
Group 2

Study Design: In vitro biomechanical study. Objectives: The objective of this in vitro biomechanical range-of-motion (ROM) study was to evaluate spinal segmental stability following fixation with a novel anterior cervical discectomy and fusion (ACDF) device (“novel device”) that possesses integrated and modular no-profile, half-plate, and full-plate fixation capabilities. Methods: Human cadaveric (n = 18, C3-T1) specimens were divided into 3 groups (n = 6/group). Each group would receive one novel device iteration. Specimen terminal ends were potted. Each specimen was first tested in an intact state, followed by anterior discectomy (C5/C6) and iterative instrumentation. Testing order: (1) novel device (group 1, no-profile; group 2, half-plate; group 3, full-plate); (2) novel device (all groups) with lateral mass screws (LMS); (3) traditional ACDF plate + cage; (4) traditional ACDF plate + cage + LMS. A 2 N·m moment was applied in flexion/extension (FE), lateral bending (LB), and axial rotation (AR) via a kinematic testing machine. Segmental ROM was tracked and normalized to intact conditions. Comparative statistical analyses were performed. Results: Key findings: (1) the novel half- and full-plate constructs provided comparable reduction in FE and LB ROM to that of traditional plated ACDF ( P ≥ .05); (2) the novel full-plate construct significantly exceeded all other anterior-only constructs ( P ≤ .05) in AR ROM reduction; and (3) the novel half-plate construct significantly exceeded the no-profile construct in FE ( P < .05). Conclusions: The novel ACDF device may be a versatile alternative to traditional no-profile and independent plating techniques, as it provides comparable ROM reduction in all principle motion directions, across all device iterations.

Biomechanical Evaluation of an Anterior Upper Thoracic Plate Fixation System: An In Vitro Human Cadaveric Study

2019 ◽  
Vol 124 ◽  
pp. e503-e509
Author(s):  
Chunxiang Xiong ◽  
Juli Luo ◽  
Dong Yin ◽  
Xinli Zhan ◽  
Huijiang Liu
Keyword(s):  
Plate Fixation ◽  
Cadaveric Study ◽  
Biomechanical Evaluation ◽  
Upper Thoracic ◽  
Fixation System

scholarly journals In vitro Biomechanical Study of Pulvertaft Tendon Weaving Technique

2011 ◽  
Vol 15 (2) ◽  
pp. 62-64 ◽  
Author(s):  
Yuen Chi-Pan ◽  
Yen Chi-Hung ◽  
Leung Hon-Bong ◽  
Tse Wing-Lim ◽  
Ho Pak-Cheong ◽  
...  
Keyword(s):  
Peak Load ◽  
Tendon Repair ◽  
Early Mobilization ◽  
Biomechanical Properties ◽  
Biomechanical Study ◽  
Load To Failure ◽  
Active Mobilization ◽  
Passive Mobilization ◽  
Single Suture

Background/Purposes The outcome of tendon repair depends on the strength, which allows early active mobilization to achieve better function without rupture. The aims of this study are to assess quantitatively the biomechanical properties and relationship between the number of tendon weaving and suture method using Pulvertaft technique. Results We found that the load to failure was increased with increasing number of weaves and sutures. From 1-weave to 4-weave single suture samples, the peak load to failure was 9.5 N, 19.7 N, 37.5 N, and 42.6 N, respectively. Based on previous studies, wrist and finger tendons should withstand 1–8N on passive mobilization. Conclusion On active mobilization, finger tendon repair need to provide 34 N for immediate mobilization. Therefore, irrespective of number of sutures, both 3- and 4-weave repairs could allow early mobilization biomechanically.

A biomechanical study on proximal plate fixation techniques in periprosthetic femur fractures

Injury ◽  
2014 ◽  
Vol 45 ◽  
pp. S71-S75 ◽  
Author(s):  
Mark Lenz ◽  
Stephan M. Perren ◽  
Boyko Gueorguiev ◽  
Robert G. Richards ◽  
Gunther O. Hofmann ◽  
...  
Keyword(s):  
Plate Fixation ◽  
Biomechanical Study ◽  
Femur Fractures ◽  
Fixation Techniques ◽  
Periprosthetic Femur Fractures

Biomechanical Testing of Distal Radius Fracture Treatments: Boundary Conditions Significantly Affect the Outcome of In Vitro Experiments

2016 ◽  
Vol 32 (2) ◽  
pp. 210-214 ◽  
Author(s):  
Alexander Synek ◽  
Yan Chevalier ◽  
Christian Schröder ◽  
Dieter H. Pahr ◽  
Sebastian F. Baumbach
Keyword(s):  
Boundary Conditions ◽  
Distal Radius Fracture ◽  
Distal Radius ◽  
Plate Osteosynthesis ◽  
Biomechanical Testing ◽  
Biomechanical Properties ◽  
Biomechanical Study ◽  
Radius Fracture ◽  
Compression Tests

The variety of experimental setups used during in vitro testing of distal radius fracture treatments impairs interstudy comparison and might lead to contradictory results. Setups particularly differ with respect to their boundary conditions, but the influence on the experimental outcome is unknown. The aim of this biomechanical study was to investigate the effects of 2 common boundary conditions on the biomechanical properties of an extra-articular distal radius fracture treated using volar plate osteosynthesis. Uniaxial compression tests were performed on 10 synthetic radii that were randomized into a proximally constrained group (ProxConst) or proximally movable group (ProxMove). The load was applied distally through a ball joint to enable distal fragment rotation. A significantly larger (ProxConst vs ProxMove) stiffness (671.6 ± 118.9 N·mm−1 vs 259.6 ± 49.4 N·mm−1), elastic limit (186.2 ± 24.4 N vs 75.4 ± 20.2 N), and failure load (504.9 ± 142.5 N vs 200.7 ± 49.0 N) were found for the ProxConst group. The residual tilt did not differ significantly between the 2 groups. We concluded that the boundary conditions have a profound impact on the experimental outcome and should be considered more carefully in both study design and interstudy comparison.

Repair of Longitudinal Meniscal Tears by Single or Double Vertical Loop Sutures: In vitro Biomechanical Study under Cyclic Loading

2019 ◽  
Vol 33 (03) ◽  
pp. 314-318 ◽  
Author(s):  
Recep Kurnaz ◽  
Murat Aşçı ◽  
Selim Ergün ◽  
Umut Akgün ◽  
Taner Güneş
Keyword(s):  
Cyclic Loading ◽  
Ultimate Load ◽  
Biomechanical Properties ◽  
Meniscus Repair ◽  
Biomechanical Study ◽  
Meniscal Tears ◽  
Pull Out ◽  
Meniscus Tissue ◽  
Significant Difference

AbstractOne of the factors affecting the healing of a meniscus repair is the primary stability of the tear. The purpose of this study is to compare single and double vertical loop (SVL vs. DVL) meniscal suture configurations by measuring elongation under cyclic loading and failure properties under ultimate load. We hypothesized that DVL configuration would have superior biomechanical properties than SVL. Twenty-two intact lateral menisci were harvested from patients who required total knee arthroplasty. A 20-mm longitudinal full-thickness cut was made 3 mm from the peripheral rim to simulate a longitudinal tear. Two groups were formed and group randomization was done according to patient age and gender (SVL group: mean age 68.3 years [range, 58–78 years], five males, six females; DVL group: mean age 67.4 years [range, 59–77 years], six males, five females). Cyclic loading was performed between 5 and 30 N at a frequency of 1 Hz for 500 cycles. Then, the meniscus repair construct was loaded until failure. Statistical analysis was performed using the t-test and the Mann–Whitney's U-test. During the early phases of cyclic loading, three specimens from each group failed because of suture pull out and are excluded from the study. At the end of 500 cycles, there was significantly less displacement in the DVL group than the SVL group (6.13 ± 1.04 vs. 9.3 ± 2.59 mm) (p < 0.05). No significant difference was found between groups regarding ultimate load to failure measurements (p > 0.05). All specimens in SVL and five specimens in DVL groups failed in the form of suture pull out from the meniscus tissue. Longitudinal meniscal tears repaired with DVL configuration had less elongation value under cyclic loading compared with SVL configuration. Because of its superior biomechanical properties, it would be more secure to repair large and instable longitudinal meniscal tears by the DVL technique. This is a level II study.

scholarly journals An In Vitro Biomechanical Evaluation of a Lateral Lumbar Interbody Fusion Device With Integrated Lateral Modular Plate Fixation

2020 ◽  
pp. 219256822090561
Author(s):  
Ryan DenHaese ◽  
Anup Gandhi ◽  
Chris Ferry ◽  
Sam Farmer ◽  
Randall Porter
Keyword(s):  
Range Of Motion ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Plate Fixation ◽  
Axial Rotation ◽  
Pedicle Screw Fixation ◽  
Biomechanical Study ◽  
Flexion Extension ◽  
Bilateral Pedicle Screw

Study Design: In vitro cadaveric biomechanical study. Objective: Biomechanically characterize a novel lateral lumbar interbody fusion (LLIF) implant possessing integrated lateral modular plate fixation (MPF). Methods: A human lumbar cadaveric (n = 7, L1-L4) biomechanical study of segmental range-of-motion stiffness was performed. A ±7.5 Nċm moment was applied in flexion/extension, lateral bending, and axial rotation using a 6 degree-of-freedom kinematics system. Specimens were tested first in an intact state and then following iterative instrumentation (L2/3): (1) LLIF cage only, (2) LLIF + 2-screw MPF, (3) LLIF + 4-screw MPF, (4) LLIF + 4-screw MPF + interspinous process fixation, and (5) LLIF + bilateral pedicle screw fixation. Comparative analysis of range-of-motion outcomes was performed between iterations. Results: Key biomechanical findings: (1) Flexion/extension range-of-motion reduction with LLIF + 4-screw MPF was significantly greater than LLIF + 2-screw MPF ( P < .01). (2) LLIF with 2-screw and 4-screw MPF were comparable to LLIF with bilateral pedicle screw fixation in lateral bending and axial rotation range-of-motion reduction ( P = 1.0). (3) LLIF + 4-screw MPF and supplemental interspinous process fixation range-of-motion reduction was comparable to LLIF + bilateral pedicle screw fixation in all directions ( P ≥ .6). Conclusions: LLIF with 4-screw MPF may provide inherent advantages over traditional 2-screw plating modalities. Furthermore, when coupled with interspinous process fixation, LLIF with MPF is a stable circumferential construct that provides biomechanical utility in all principal motions.

Plate fixation of comminuted olecranon fractures: An in vitro biomechanical study

1996 ◽  
Vol 5 (6) ◽  
pp. 437-441 ◽  
Author(s):  
G.J.W. King ◽  
P.N. Lammens ◽  
A.D. Milne ◽  
J.H. Roth ◽  
J.A. Johnson
Keyword(s):  
Plate Fixation ◽  
Biomechanical Study ◽  
Olecranon Fractures
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