scholarly journals Do commonly used postoperative orthopaedic shoes help off-load the forefoot?

2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Magdalena Stawińska ◽  
Paweł Kołodziejski ◽  
Ida Wiszomirska ◽  
Mateusz Baran ◽  
Andrzej Wit
Keyword(s):  
High Pressure ◽  
Pressure Distribution ◽  
Load Distribution ◽  
Gait Cycle ◽  
Pressure Measurements ◽  
Uniform Load ◽  
Foot Pressure ◽  
Graphic Form ◽  
Metatarsal Bones ◽  
Rocker Shoes

Purpose: The aim of the experiment presented in this study was to determine the pressure distribution within the forefoot depending on the type of orthopaedic footwear used. Methods: The study included 27 women aged 20 to 25. The Zebris FDM-2 dynamographic platform was used in foot pressure measurements. The load distribution was measured in three types of orthopaedic footwear: MedSurg, MedSurgPro and OrthoWedge. The full gait cycle was recorded. The Cavanagh masks were applied to the load distribution results processed into a graphic form. The data were analysed using Statistica v.13.1. Results: In the forefoot area, i.e. the metatarsal bones and toes 1–5, the lowest loads were reported in the shoes that off-load the forefoot (0.2 N/cm2, p < 0.001). In the area of the first to fifth metatarsal bones and the hallux, the highest load was observed in the rocker shoe, accounting for 19.7 N/cm2 (p < 0.001). For comparison, high pressure in the flat shoe was found in the area of toes 2 to 5 (p < 0.001). Conclusions: In the area of the metatarsal and toe bones, the pressure exerted was highest in the commonly used rocker shoe. The flat shoe provides an even and uniform load in all areas of the forefoot, while this type of shoe does not significantly reduce the pressure forces on the forefoot. The shoe that was the most effective in off-loading was the forefoot off-loading shoe (OrthoWedge). Barefoot walking puts less load on the forefoot compared to the flat and rocker shoes used after orthopaedic procedures.

Effects of external light load on posture and foot pressure distribution in young adults: A pilot study

2021 ◽  
Vol 82 ◽  
pp. 103102
Author(s):  
Magdalena Zawadka ◽  
Maciej Kochman ◽  
Miroslaw Jablonski ◽  
Piotr Gawda
Keyword(s):  
Young Adults ◽  
Pilot Study ◽  
Pressure Distribution ◽  
Foot Pressure ◽  
Light Load

The Inductive Coil Technique for High-Pressure Measurements: An Analysis of Nonhomogeneous Material Environment as a Source of Irreproducibility and Error

1967 ◽  
Vol 89 (3) ◽  
pp. 554-560 ◽  
Author(s):  
A. A. Giardini
Keyword(s):  
High Pressure ◽  
Internal Pressure ◽  
Elastic Constants ◽  
Graphical Form ◽  
Pressure Measurements ◽  
Pressure Data ◽  
Nonhomogeneous Material ◽  
Resistivity Measurements ◽  
Material Environment ◽  
Critical Yield

Significant sources of error independent of the apparatus are analyzed on the basis of experimental experience and elastic theory. All are mechanical in nature and subject to corrective action. The most serious is found to be self-generating internal pressure differences which result from differential elastic and dimensional values in multicomponent assemblies. High-pressure data on elastic constants, relative critical yield stresses, radial displacements, and ratios of external to internal pressure for various compositional arrangements of pyrophyllite, MgO, NaCl, and AgCl are given in graphical form. Observance of suggested corrective measures can render the inductive coil technique capable of operational accuracies of 2 percent or better in compressibility and resistivity measurements.

Foot pressure distribution in patients with gonarthrosis

The Foot ◽  
2012 ◽  
Vol 22 (2) ◽  
pp. 70-73 ◽  
Author(s):  
Tsutomu Motooka ◽  
Hirofumi Tanaka ◽  
Shuya Ide ◽  
Masaaki Mawatari ◽  
Takao Hotokebuchi
Keyword(s):  
Pressure Distribution ◽  
Foot Pressure

Research on Sealing Performance in High Pressure Oil-Free Miniature Air Compressor

2017 ◽  
Author(s):  
Yipan Deng ◽  
Yinshui Liu ◽  
Fan Li ◽  
Pengyun Tian ◽  
Na Miao
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Research Work ◽  
Piston Rings ◽  
Premature Failure ◽  
Air Compressor ◽  
Sealing Performance ◽  
Rotary Speed ◽  
Discharge Pressure

High pressure oil-free miniature air compressor has an irreplaceable role in some high demand areas such as cooling, scuba diving and pneumatic catapult due to its remarkable advantages such as compacted size, lightened weight and clean output gas. As the important sealing component in the high pressure oil-free miniature air compressor, piston rings hold the properties such as tiny diameter (less than 10mm), high sealing pressure (up to 410 bar) and high surrounding temperature (up to 500K), which make them distinctive from conventional piston rings. A mathematical model was established to simulate the pressure distribution of the compressor chamber, as well as the gap between the sealing rings. Sensitive parameters were considered to investigate their effects on the sealing performance such as the number and the cut size of the piston rings, the suction and discharge pressure and the rotary speed. The mathematical model was verified by comparing to published experimental research work. These work help to reveal the severe non-uniformity of the pressure distribution of different chambers, which were suggested be the primary cause of the premature failure of the sealing rings, thus improving the sealing performance and the service life of the air compressor.

Surface Profile Analysis for Conformable Interfaces

2003 ◽  
Vol 125 (3) ◽  
pp. 624-627 ◽  
Author(s):  
Mark C. Malburg
Keyword(s):  
Contact Area ◽  
Load Distribution ◽  
Profile Analysis ◽  
Surface Profile ◽  
Solid Surfaces ◽  
Analysis Method ◽  
Uniform Load ◽  
Morphological Filtering ◽  
Novel Method

This paper presents a novel method for the analysis of solid surfaces in contact with a conformable component. These applications are common in many engine and hydraulic applications, wherein conformable seals, gaskets, bushings, etc. are employed to prevent unwanted flow across an interface or provide a uniform load distribution. The proposed analysis method employs a combination of meanline (m-system) filtering and envelope (e-system) or morphological filtering. Through this analysis, a simulation of contact area and the associated voids or gaps can be assessed.

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