scholarly journals Accuracy of a non-invasive CT-based measuring technique for cement penetration depth in human tibial UKA

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Christian B. Scheele ◽  
Peter E. Müller ◽  
Christian Schröder ◽  
Thomas Grupp ◽  
Volkmar Jansson ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Measuring Technique ◽  
Non Invasive ◽  
Cement Penetration

Pulsatile Lavage Improves Tibial Cement Penetration and Implant Stability in Medial Unicompartmental Arthroplasty: A Cadaveric Study

2021 ◽  
Author(s):  
Johannes A. Eckert ◽  
Rudi G. Bitsch ◽  
Stefan Schroeder ◽  
Martin Schwarze ◽  
Sebastian Jaeger
Keyword(s):  
Penetration Depth ◽  
Tibial Component ◽  
Mobile Bearing ◽  
Fracture Load ◽  
Implant Failure ◽  
Jet Lavage ◽  
Cement Penetration ◽  
Fresh Frozen ◽  
Group A ◽  
And Function

AbstractCemented unicompartmental knee arthroplasty (UKA) shows good survivorship and function. However, implant failure, causing the need for revision, can occur. Aseptic loosening is still among the most common reasons for revision. The purpose of this study was to assess the influence of preimplantation lavage technique on tibial cement penetration depth, tibial cement volume, and load to fracture in the tibial component of mobile-bearing UKA. In 10 pairs of fresh frozen human tibiae, cemented UKA was implanted by an experienced surgeon. Tibial components were then implanted, left and right tibiae were randomly allocated to group A or B. Prior to implantation, irrigation was performed with either syringe lavage or pulsatile jet lavage in a standardized manner. Cement surface was 4170.2 mm2 (3271.6–5497.8 mm2) in the syringe lavage group, whereas the jet lavage group showed 4499.3 mm2 (3354.3–5809.1 mm2); cement volume was significantly higher as well (4143.4 mm3 (2956.6–6198.6 mm3) compared with 5936.9 mm3 (3077.5–8183.1 mm3)). Cement penetration depth was 2.5 mm (1.7–3.2 mm) for the jet lavage, and 1.8 mm (1.2–2.4 mm) for the syringe lavage. The mean fracture load was 4680 N in the jet lavage group and 3800 N in the syringe lavage group (p = 0.001). Subsidence was significantly higher for syringe lavage. This study suggests a correlation of cement penetration depth and cement volume to implant failure in the tibial component of a UKA using a cadaveric model. The type of bone lavage most likely influences these two key parameters.

Pressure-Sensitive Paint Measurements in Narrow Clearances: A Feasibility Study

2019 ◽  
Author(s):  
Anna-L. Zimmermann ◽  
Mattia Graiff ◽  
Q. Tue Nguyen Tran ◽  
Volker Guemmer
Keyword(s):  
High Pressure ◽  
Pressure Distribution ◽  
Calibration Method ◽  
Measuring Technique ◽  
Pressure Sensitive Paint ◽  
Test Rig ◽  
Test Configuration ◽  
Non Invasive ◽  
Pressure Sensitive ◽  
Aerostatic Bearings

Abstract Pressure distribution in the bearing clearance of aerostatic bearings has received great attention since it has fundamental influence on the performance of the bearing. Thus, it is important to seek for accurate and global pressure distribution measurements. Pressure-sensitive paint (PSP) therefore qualifies as a promising measuring technique. It is of non-invasive nature, and hence eliminates many of the otherwise unavoidable drawbacks of conventional pressure taps. This paper introduces a conceptual test configuration aiming for employing PSP as measuring technique in narrow clearances. It is a pilot study including hardware modifications as well as considerations of an appropriate choice of paint, imaging equipment and calibration method. The effect of the coat surface quality is discussed, and a scaling methodology is proposed to transfer the high pressure conditions from machine to test rig conditions, so that PSP measurements are possible.

Facile and Effective Phononic Structures for Ultrasound Focusing Application

2014 ◽  
Author(s):  
Qiuquan Guo ◽  
Xiaobing Cai ◽  
Jun Yang
Keyword(s):  
Penetration Depth ◽  
Acoustic Energy ◽  
Ultrasound Therapy ◽  
Acoustic Metamaterials ◽  
High Frequency Ultrasound ◽  
Low Frequencies ◽  
Non Invasive ◽  
Wavelength Resolution ◽  
Invasive Method ◽  
Sub Wavelength

Ultrasound therapy is a highly popular non-invasive method to treat diseases. It is desired to increase the resolution of ultrasound therapy, providing more efficient therapeutic effect. In this study, a simple but effective phononic structure was designed to achieve higher resolution close to wavelength resolution of ultrasound focusing. The objective of this study is to design a unique phononic structure to focus acoustic wave into human body more deeply and precisely. It is known that overheating by high frequency ultrasound will cause a series of side effects including bone burns, soft tissue burns, swelling and bleeding problems. In addition, due to the limited propagation of recovered evanescent wave, the penetration depth of acoustic energy being focused by the acoustic metamaterials is often hindered. In this study, we will design a multilayer acoustic metamaterial which shows sub-wavelength focusing ability at relatively low frequencies. More importantly, our design will also extend the ability of penetration depth by manipulating the focusing length through optimization of the phononic structure.

Non-invasive in vivo near-infrared optical measurement of the penetration depth in the neonatal head

1991 ◽  
Vol 12 (4) ◽  
pp. 353-358 ◽  
Author(s):  
F Faris ◽  
M Thorniley ◽  
Y Wickramasinghe ◽  
R Houston ◽  
P Rolfe ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Near Infrared ◽  
Optical Measurement ◽  
Non Invasive

Hypoxia-alleviated sonodynamic therapy based on a hybrid protein oxygen carrier to enhance tumor inhibition

2021 ◽  
Author(s):  
Ting Yin ◽  
Jia Yin ◽  
Hui Ran ◽  
Yaguang Ren ◽  
Chengyu Lu ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Therapeutic Effect ◽  
Oxygen Carrier ◽  
Tumor Hypoxia ◽  
Hybrid Protein ◽  
Sonodynamic Therapy ◽  
Tumor Inhibition ◽  
Non Invasive ◽  
Good Penetration

Sonodynamic therapy (SDT) is a highly attractive therapy due to its advantages of being non-invasive and having good penetration depth, but tumor hypoxia extremely restricts its therapeutic effect.

scholarly journals Application of the TDR measuring technique for in-situ measurements using surface probes

2011 ◽  
Vol 8 (1) ◽  
pp. 097-106
Author(s):  
Zbigniew Suchorab ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
In Situ Measurements ◽  
Measuring Technique ◽  
Ceramic Brick ◽  
Non Invasive

The article presents the possibility of in-situ measurements of building barriers moisture using the TDR technique (Time Domain Reflectometry). To minimize the previous disadvantages of the described method – invasive character, several prototypes of the surface probes were manufactured. With such a sensor solution it was possible to conduct the non-invasive measurements using the full TDR method potential – quick measurements and no sensitivity of salinity influence. The measurements were conducted on the brickworks made of red ceramic brick at the old building located on 1st of May Street in Lublin.

NMR depth profiles as a non-invasive analytical tool to probe the penetration depth of hydrophobic treatments and inhomogeneities in treated porous stones

2011 ◽  
Vol 400 (9) ◽  
pp. 3151-3164 ◽  
Author(s):  
Valeria Di Tullio ◽  
Noemi Proietti ◽  
Donatella Capitani ◽  
Ilaria Nicolini ◽  
Anna Maria Mecchi
Keyword(s):  
Penetration Depth ◽  
Analytical Tool ◽  
Depth Profiles ◽  
Non Invasive
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