Interface pressure in transtibial socket during ascent and descent on stairs and its effect on patient satisfaction

Ali, Sadeeq; Osman, Noor Azuan Abu; Eshraghi, Arezoo; Gholizadeh, Hossein; Razak, Nasrul Anuar Abd; Abas, Wan Abu Bakar Wan

doi:10.1016/j.clinbiomech.2013.09.004

Cited by 50 publications

(53 citation statements)

References 25 publications

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“…oedema and skin carcinoma [4,11,[13][14][15][16][17][18]. In the worst case, chronic ulceration and associated infection can lead to reamputation of the limb, further restricting functionality [19].…”

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confidence: 99%

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

2020

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Velostat is a low-cost, low-profile electrical bagging material with piezoresistive properties, making it an attractive option for in-socket pressure sensing. The focus of this research was to explore the suitability of a Velostatbased system for providing real-time socket pressure profiles. The prototype system performance was explored through a series of bench tests to determine properties including accuracy, repeatability and hysteresis responses, and through participant testing with a single subject. The fabricated sensors demonstrated mean accuracy errors of 110 kPa and significant cyclical and thermal drift effects of up to 0.00715 V/cycle and leading to up to a 67% difference in voltage range respectively. Despite these errors the system was able to capture data within a prosthetic socket, aligning to expected contact and loading patterns for the socket and amputation type. Distinct pressure maps were obtained for standing and walking tasks displaying loading patterns indicative of posture and gait phase. The system demonstrated utility for assessing contact and movement patterns within a prosthetic socket, potentially useful for improvement of socket fit, in a low cost, low profile and adaptable format. However, Velostat requires significant improvement in its electrical properties before proving suitable for accurate pressure measurement tools in lower limb prosthetics.

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confidence: 99%

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

2020

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“…The sensor used in the current study is 9811E Tekscan TM ultra-thin (0.18mm) sensor. The same sensor has been used by other studies as it has sensitivity to detect low range interface pressure, flexible and not distorted by the skin (Ali et al 2013(Ali et al , 2012Eshraghi et al 2012;Gholizadeh et al 2014;Macintyre 2011). The sensitivity of the sensor however, are deteriorating with time.…”

Section: The Effects Of Body Dimension On Orthosis Interface Pressurementioning

confidence: 99%

Interface Pressure of Lycra Orthosis at Different Postures in Children with Cerebral Palsy (CP)

Shaari¹,

Osman²,

Shasmin³

2018

JSM

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Medical compression garment functions by exerted interface pressure between the fabric and skin. Yet, none of the previous studies have determine the pressure level of Lycra based orthosis. The current work aimed to determine the pressure level of Lycra orthosis at different postures in children with CP. Five (5) children with CP were recruited. Each were given a custom made Lycra orthosis. Two Tekscan medical sensor were placed over lateral side of upper garment and pants. The pressure was recorded when the child was in sitting, sit-to-stand (STS) and standing postures. There are significant differences of the interface pressure between each children, at different postures. The highest pressure recorded over upper garment is 122 mmHg and 120 mmHg over pants, both during sitting position. Overall, the Lycra orthosis exerted highest pressure over top garments than pants during sitting position.

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“…Attempts are ongoing to assist the amputee subjects to interact more naturally with the sensory system by making use of the specific high pressure locations inside the socket. Other sensors placed inside the socket such as the F-socket sensor have been used in investigating the pressure around the residual limb, but they were not meant for daily integration into the socket for identifying knee movements in active transfemoral prosthesis [ 14 ]. Various kinds of pressure sensors are used to measure the pressure for both transtibial and transfemoral amputees [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Detection of Prosthetic Knee Movement Phases via In‐Socket Sensors: A Feasibility Study

El‐Sayed

Hamzaid

Tan

et al. 2015

The Scientific World Journal

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This paper presents an approach of identifying prosthetic knee movements through pattern recognition of mechanical responses at the internal socket's wall. A quadrilateral double socket was custom made and instrumented with two force sensing resistors (FSR) attached to specific anterior and posterior sites of the socket's wall. A second setup was established by attaching three piezoelectric sensors at the anterior distal, anterior proximal, and posterior sites. Gait cycle and locomotion movements such as stair ascent and sit to stand were adopted to characterize the validity of the technique. FSR and piezoelectric outputs were measured with reference to the knee angle during each phase. Piezoelectric sensors could identify the movement of midswing and terminal swing, pre-full standing, pull-up at gait, sit to stand, and stair ascent. In contrast, FSR could estimate the gait cycle stance and swing phases and identify the pre-full standing at sit to stand. FSR showed less variation during sit to stand and stair ascent to sensitively represent the different movement states. The study highlighted the capacity of using in-socket sensors for knee movement identification. In addition, it validated the efficacy of the system and warrants further investigation with more amputee subjects and different sockets types.

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Interface pressure in transtibial socket during ascent and descent on stairs and its effect on patient satisfaction

Cited by 50 publications

References 25 publications

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

Interface Pressure of Lycra Orthosis at Different Postures in Children with Cerebral Palsy (CP)

Detection of Prosthetic Knee Movement Phases via In‐Socket Sensors: A Feasibility Study

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