In vitro biomechanical comparison of a newly designed interlocking nail system to a standard DCP

2014 ◽  
Vol 42 (02) ◽  
pp. 79-87 ◽  
Author(s):  
M. Unger ◽  
M. Spies ◽  
M. Brückner
Keyword(s):  
Biomechanical Testing ◽  
Femoral Fractures ◽  
Gap Model ◽  
Application Range ◽  
Interlocking Nail ◽  
Osteosynthesis Plate ◽  
Specialized Equipment ◽  
The Stability ◽  
Biomechanical Comparison

Summary Objective: To describe a newly designed interlocking nail system (Targon® Vet System, TVS) tested in a model of diaphyseal femoral fractures in cats. Material and methods: Introduction of the TVS and presentation of the system components. Evaluation of application range and biomechanical testing of the TVS in cadaver bones under cyclic loading until fatigue failure occurred. The first two test groups compared the influence of implantation and immediate removal of the TVS locking bolts and six holes created by 2.0 mm cortical screws on the stability of feline femora. In the third group the two fixation systems were compared to each other with implants in place in an osteotomy gap model. The failure mode was statistically compared for each group (p < 0.05). Results: Femora after implantation and removal of the bolts of the TVS were significantly stiffer than after implantation and removal of the six 2.0 mm cortical screws. In the osteotomy gap model, femora with the TVS in place failed somewhat later, but not statistically significant, than the opposite femur of the same cat with the 2.0 8-hole DCP in place. Conclusion and clinical relevance: Using this testing method, stability of the TVS seems to be biomechanically comparable to conventional osteosynthesis plate systems. Therefore the TVS may be an encouraging alternative to conventional osteosynthesis systems in diaphyseal fractures, offering several advantages without the need for extensive specialized equipment.

Biomechanical Comparison of Two Alternative Tibial Plateau Leveling Osteotomy Plates with the Original Standard in an Axially Loaded Gap Model: An In Vitro Study

2009 ◽  
Vol 38 (1) ◽  
pp. 40-48 ◽  
Author(s):  
PAUL A. KLOC ◽  
MICHAEL P. KOWALESKI ◽  
ALAN S. LITSKY ◽  
NANCY O. BROWN ◽  
KENNETH A. JOHNSON
Keyword(s):  
Tibial Plateau ◽  
In Vitro Study ◽  
Vitro Study ◽  
Gap Model ◽  
Axially Loaded ◽  
Biomechanical Comparison

An in vitro biomechanical comparison of two interlocking-nail systems for fixation of ostectomized equine third metacarpal bones

2001 ◽  
Vol 30 (3) ◽  
pp. 246-252 ◽  
Author(s):  
Mandi J. Lopez ◽  
David G. Wilson ◽  
Steven S. Trostle ◽  
Mark D. Markel
Keyword(s):  
Interlocking Nail ◽  
Metacarpal Bones ◽  
Biomechanical Comparison

An in vitro biomechanical comparison of interlocking nail constructs and double plating for fixation of diaphyseal femur fractures in immature horses

2001 ◽  
Vol 30 (2) ◽  
pp. 179-190 ◽  
Author(s):  
Rolfe M. Radcliffe ◽  
Mandi J. Lopez ◽  
Tracy A. Turner ◽  
Jeffrey P. Watkins ◽  
Catherine H. Radcliffe ◽  
...  
Keyword(s):  
Interlocking Nail ◽  
Femur Fractures ◽  
Biomechanical Comparison ◽  
Double Plating

A biomechanical comparison of unilateral and bilateral String-of-Pearls™ locking plates in a canine distal humeral metaphyseal gap model

2014 ◽  
Vol 27 (03) ◽  
pp. 186-191 ◽  
Author(s):  
J. A. Syrcle ◽  
S. Elder ◽  
R. McLaughlin ◽  
R. J. Hurt
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Locking Plates ◽  
Gap Model ◽  
Supracondylar Humeral Fractures ◽  
Biomechanical Comparison ◽  
Sop Plate ◽  
String Of Pearls ◽  
Monocortical Screws

SummaryObjective: To compare the in vitro biomechanical performance of two String-of-Pearls (SOP) plate constructs in a canine distal humeral metaphyseal gap model.Methods: Seven pairs of canine cadaveric humeri, including the elbow joints, were prepared. One group consisted of a unilateral medially placed SOP plate with bicortical screws (UNI). The second group consisted of bilateral caudo-medial and caudo-lateral SOP plates applied with monocortical screws (BI). A 2 cm ostectomy was performed immediately proximal to the supratrochlear foramen. Constructs were tested in torsion and axial compression.Results: The UNI constructs had significantly lower stiffness in torsion and axial compression than the BI group. However, UNI constructs had a significantly higher ultimate strength than BI constructs. All UNI constructs failed by bending of the transcondylar screw and SOP plate. All BI constructs failed by axial pullout of the distal most screws.Clinical significance: In stabilizing canine supracondylar humeral fractures as modeled here, both the UNI model and the BI model demonstrated biomechanical advantages. The incorporation of a transcondylar screw through the medial plate appears to be beneficial to construct strength.

In vitro biomechanical comparison of limited contact dynamic compression plate and locking compression plate

2005 ◽  
Vol 18 (04) ◽  
pp. 220-226 ◽  
Author(s):  
J. M. Manos ◽  
A. S. Orlansky ◽  
R. J. Todhunter ◽  
E. J. Trotter ◽  
M. C. H. van der Meulen ◽  
...  
Keyword(s):  
Dynamic Compression ◽  
Twist Angle ◽  
Biomechanical Testing ◽  
Good Alternative ◽  
Locking Compression Plate ◽  
Fracture Repair ◽  
Dynamic Compression Plate ◽  
Compression Plate ◽  
Biomechanical Comparison

SummaryThe locking compression plate (LCP) supports biological osteosynthesis by functioning as an internal fixator, rather than as a full or limited contact bone plate which must be adequately contoured and affixed directly to the bone for stable internal fixation of the fracture. In order to help justify the use of the LCP in our veterinary patients, in vitro biomechanical testing was performed comparing the LCP to the conventional limited contact dynamic compression plate (LC-DCP) in canine femurs. We hypothesized that the LCP construct would be at least as stiff under bending and torsional loads as the LC-DCP. The LCP and LC-DCP were applied over a 20-mm osteotomy gap to contralateral bones within each pair of 14 femora. Non-destructive four-point bending and torsion, and cyclical testing in torsion were performed. The constructs were then loaded to failure in torsion. In medial-lateral and lateral-medial structural bending, significant differences were not found between the LCP and LC-DCP, however, at the gap, the LCP construct was stiffer than the LC-DCP in lateral-medial bending. Significant differences in behaviour over time were not noted between the plate designs during cyclical testing. When loading the constructs to failure in internal rotation, the LC-DCP failed at a significantly lower twist angle (P = .0024) than the LCP. Based on the similar performance with loading, the locking compression plate is a good alternative implant for unstable diaphyseal femoral fracture repair in dogs.

In vitro biomechanical comparison of a plate-rod combination–construct and an interlocking nail–construct for experimentally induced gap fractures in canine tibiae

2005 ◽  
Vol 66 (9) ◽  
pp. 1536-1543 ◽  
Author(s):  
Dirsko J. F. von Pfeil ◽  
Loïc M. Déjardin ◽  
Charles E. DeCamp ◽  
Eric G. Meyer ◽  
Jennifer L. Lansdowne ◽  
...  
Keyword(s):  
Interlocking Nail ◽  
Biomechanical Comparison ◽  
Experimentally Induced

scholarly journals Evidence Based Development of a Novel Lateral Fibula Plate (VariAx Fibula) Using a Real CT Bone Data Based Optimization Process During Device Development

2012 ◽  
Vol 6 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Arndt P Schulz ◽  
Nils Reimers ◽  
Felix Wipf ◽  
Michel Vallotton ◽  
Serena Bonaretti ◽  
...  
Keyword(s):  
Clinical Application ◽  
Biomechanical Testing ◽  
Trauma Surgery ◽  
Lateral Position ◽  
Optimization Process ◽  
Evidence Based ◽  
Clinical Surveillance ◽  
The Stability ◽  
Biomechanical Comparison ◽  
High Degree

Development of novel implants in orthopaedic trauma surgery is based on limited datasets of cadaver trials or artificial bone models. A method has been developed whereby implants can be constructed in an evidence based method founded on a large anatomic database consisting of more than 2.000 datasets of bones extracted from CT scans. The aim of this study was the development and clinical application of an anatomically pre-contoured plate for the treatment of distal fibular fractures based on the anatomical database. 48 Caucasian and Asian bone models (left and right) from the database were used for the preliminary optimization process and validation of the fibula plate. The implant was constructed to fit bilaterally in a lateral position of the fibula. Then a biomechanical comparison of the designed implant to the current gold standard in the treatment of distal fibular fractures (locking 1/3 tubular plate) was conducted. Finally, a clinical surveillance study to evaluate the grade of implant fit achieved was performed. The results showed that with a virtual anatomic database it was possible to design a fibula plate with an optimized fit for a large proportion of the population. Biomechanical testing showed the novel fibula plate to be superior to 1/3 tubular plates in 4-point bending tests. The clinical application showed a very high degree of primary implant fit. Only in a small minority of cases further intra-operative implant bending was necessary. Therefore, the goal to develop an implant for the treatment of distal fibular fractures based on the evidence of a large anatomical database could be attained. Biomechanical testing showed good results regarding the stability and the clinical application confirmed the high grade of anatomical fit.

Formation and Structure of Casein Micelles in Lactating Mammary Tissue

1970 ◽  
Vol 28 ◽  
pp. 150-151
Author(s):  
Robert J. Carroll ◽  
Marvin P. Thompson ◽  
Harold M. Farrell
Keyword(s):  
Size Distribution ◽  
G Protein ◽  
Milk Proteins ◽  
Mammary Tissue ◽  
Colloidal System ◽  
Casein Micelles ◽  
The Stability

Milk is an unusually stable colloidal system; the stability of this system is due primarily to the formation of micelles by the major milk proteins, the caseins. Numerous models for the structure of casein micelles have been proposed; these models have been formulated on the basis of in vitro studies. Synthetic casein micelles (i.e., those formed by mixing the purified αsl- and k-caseins with Ca2+ in appropriate ratios) are dissimilar to those from freshly-drawn milks in (i) size distribution, (ii) ratio of Ca/P, and (iii) solvation (g. water/g. protein). Evidently, in vivo organization of the caseins into the micellar form occurs in-a manner which is not identical to the in vitro mode of formation.

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