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Hossein Gholizadeh - One of the best experts on this subject based on the ideXlab platform.
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Patient-specific Interface pressure case study at transradial prosthetic Socket: comparison trials between ICRC polypropylene Socket and air splint Socket.
European Journal of Physical and Rehabilitation Medicine, 2016Co-Authors: Abd Razak Na, Abu Osman Na, Hossein GholizadehAbstract:While considering how important the Interface between the amputees with the prostheses Socket, we have carried out research to compare the gradient pressure occur at the Interface Socket that may lead to the discomforting effects to the user using common ICRC polypropylene Socket and air splint Socket. Not Applicable SETTING: Not Applicable POPULATION: The subject was a 23 year old who suffered a traumatic defect on the right arm caused by higher electrical volt. F-Socket sensors have been used to measure dynamic Socket Interface pressure for the transradial amputee wearer during static and dynamic movements. The printed circuit with a thickness of 0.18 mm is equipped between the Socket and the surface of the residual limb. Two F-Socket sensor is required to cover the entire Socket surface attached to the residual limb. The average of 10 trials made on prosthetic user using both type of Sockets for static and dynamic movements was recorded. The pressure gradient shows that the circumference of the Socket Interface for the ICRC polypropylene Socket gives the most pressure distributions to the amputees compared to the pressure gradient for the air splint Socket. The pressure gradient for ICRC Socket increased consistently when the user makes movements while for the air splint Socket remain constantly. The specific Interface pressure occur at the Socket Interface help in determine the comfort and pain of the Socket design and improve the correlation between the user and the prosthesis.
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Patient-specific Interface pressure case study at transradial prosthetic Socket: comparison trials between ICRC polypropylene Socket and air splint Socket.
European journal of physical and rehabilitation medicine, 2016Co-Authors: Abu Osman Na, Sadeeq Ali, Hossein GholizadehAbstract:BACKGROUND While considering how important the Interface between the amputees with the prostheses Socket, we have carried out research to compare the gradient pressure occur at the Interface Socket that may lead to the discomforting effects to the user using common ICRC polypropylene Socket and air splint Socket. DESIGN Not Applicable SETTING: Not Applicable POPULATION: The subject was a 23 year old who suffered a traumatic defect on the right arm caused by higher electrical volt. METHODS F-Socket sensors have been used to measure dynamic Socket Interface pressure for the transradial amputee wearer during static and dynamic movements. The printed circuit with a thickness of 0.18 mm is equipped between the Socket and the surface of the residual limb. Two F-Socket sensor is required to cover the entire Socket surface attached to the residual limb. The average of 10 trials made on prosthetic user using both type of Sockets for static and dynamic movements was recorded. RESULTS The pressure gradient shows that the circumference of the Socket Interface for the ICRC polypropylene Socket gives the most pressure distributions to the amputees compared to the pressure gradient for the air splint Socket. CONCLUSION The pressure gradient for ICRC Socket increased consistently when the user makes movements while for the air splint Socket remain constantly. CLINICAL REHABILITATION IMPACT The specific Interface pressure occur at the Socket Interface help in determine the comfort and pain of the Socket design and improve the correlation between the user and the prosthesis.
Ming Zhang - One of the best experts on this subject based on the ideXlab platform.
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pressure distribution at the stump Socket Interface in transtibial amputees during walking on stairs slope and non flat road
Clinical Biomechanics, 2006Co-Authors: Peng Dou, Xiaohong Jia, Shuangfu Suo, Rencheng Wang, Ming ZhangAbstract:Abstract Background Studies examining the stump/Socket Interface stresses have been restricted to unsupported stance and natural gait, i.e. walking at a comfortable speed on flat and straight walkway. However, the pressure behaviour as to the Interface in unilateral transtibial amputees during walking on stairs, slope and non-flat road is unclear. Methods Pressure distribution changes at multiple points, expressed as mean peak stump/Socket Interface pressure, mean pressure level over 90% of peak pressure, time in which pressure exceeded 90% of peak pressure and time–pressure integral at the period of sustained sub-maximal load, were measured during natural ambulating and walking on stairs, slope and non-flat road. Findings Compared with natural gait, the mean peak pressure and sustained sub-maximal load increase notably over the patellar tendon during walking on stairs and non-flat road, and however decrease or change insignificantly at the patellar tendon on slope and over other measured areas in all conditions; moreover the time period of sustained sub-maximal load changes remarkably, except over the patellar tendon during walking up slope and over the popliteal area on non-flat road; finally, the time–pressure integral in the time period of sustained sub-maximal load changes considerably, except at the patellar tendon during walking up slope. Interpretation The pressure characteristics during natural ambulating seem not to be highly predictive of what occurs in the conditions of walking on stairs, slope and non-flat road, which leads to significant increase in amplitude domain of tissue loading only at the patellar tendon, and however to remarkable changes in temporal sequences of tissue (un-)loading almost in all measured regions.
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Pressure distribution at the stump/Socket Interface in transtibial amputees during walking on stairs, slope and non-flat road
Clinical biomechanics (Bristol Avon), 2006Co-Authors: Peng Dou, Xiaohong Jia, Shuangfu Suo, Rencheng Wang, Ming ZhangAbstract:Abstract Background Studies examining the stump/Socket Interface stresses have been restricted to unsupported stance and natural gait, i.e. walking at a comfortable speed on flat and straight walkway. However, the pressure behaviour as to the Interface in unilateral transtibial amputees during walking on stairs, slope and non-flat road is unclear. Methods Pressure distribution changes at multiple points, expressed as mean peak stump/Socket Interface pressure, mean pressure level over 90% of peak pressure, time in which pressure exceeded 90% of peak pressure and time–pressure integral at the period of sustained sub-maximal load, were measured during natural ambulating and walking on stairs, slope and non-flat road. Findings Compared with natural gait, the mean peak pressure and sustained sub-maximal load increase notably over the patellar tendon during walking on stairs and non-flat road, and however decrease or change insignificantly at the patellar tendon on slope and over other measured areas in all conditions; moreover the time period of sustained sub-maximal load changes remarkably, except over the patellar tendon during walking up slope and over the popliteal area on non-flat road; finally, the time–pressure integral in the time period of sustained sub-maximal load changes considerably, except at the patellar tendon during walking up slope. Interpretation The pressure characteristics during natural ambulating seem not to be highly predictive of what occurs in the conditions of walking on stairs, slope and non-flat road, which leads to significant increase in amplitude domain of tissue loading only at the patellar tendon, and however to remarkable changes in temporal sequences of tissue (un-)loading almost in all measured regions.
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Effect of Shank Flexibility of Trans-Tibial Prosthesis on Interface Stress Between Residual Limb and Prosthetic Socket
2004Co-Authors: Winson C.c. Lee, Ming Zhang, D A Boone, Bill ContoyannisAbstract:Transtibial amputees usually demonstrate some gait abnormalities which are due to the loss of active motions of the ankle joint. Prostheses have been designed to compensate for the loss of motions by incorporating flexible keels or shanks. Extensive research has been carried out to look into the benefits given by those components. However, the effect of the introduction of those flexible components on stresses at residual limb-prosthetic Socket Interface did not receive much attention. The understanding of the stresses at limb-Socket Interface is fundamental to achieve a successful prosthesis fit. Theoretical analyses using finite element (FE) analysis has been widely used to study the Interface stress. It offers advantages that stress, strain and motion in any parts of the model can be predicted and parametric analyses can be performed easily. In most previous FE models, only Socket and the limb were involved and no attempt has been made to study the effect changes of distal components of the prostheses on Interface stress. In this study, a FE model with the limb and the whole prosthesis was created and the effect of the shank flexibility on limb-Socket Interface stresses were studied. The prosthesis studied here is a total thermoplastic prosthesis with the shank and Socket molded into one piece of polypropylene material.
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Finite-element analysis to determine effect of monolimb flexibility on structural strength and interaction between residual limb and prosthetic Socket
The Journal of Rehabilitation Research and Development, 2004Co-Authors: Winson C.c. Lee, Ming Zhang, D A Boone, Bill ContoyannisAbstract:Monolimb refers to a kind of transtibial prostheses having the Socket and shank molded into one piece of thermo- plastic material. One of its characteristics is that the shank is made of a material that can deform during walking, which can simulate ankle joint motion to some extent. Changes in shank geometry can alter the stress distribution within the monolimb and at the residual limb-Socket Interface and, respectively, affect the deformability and structural integrity of the prosthe- sis and comfort perceived by amputees. This paper describes the development of a finite-element model for the study of the structural behavior of monolimbs with different shank designs and the interaction between the limb and Socket during walk- ing. The von Mises stress distributions in monolimbs with dif- ferent shank designs at different walking phases are reported. With the use of distortion energy theory, possible failure was predicted. The effect of the stiffness of the monolimb shanks on the stress distribution at the limb-Socket Interface was stud- ied. The results show a trend—the peak stress applied to the limb was lowered as the shank stiffness decreased. This infor- mation is useful for future monolimb optimization.
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state of the art research in lower limb prosthetic biomechanics Socket Interface a review
Journal of Rehabilitation Research and Development, 2001Co-Authors: Ming Zhang, D A BooneAbstract:Scientific studies have been conducted to quantify attributes that may be important in the creation of more functional and comfortable lower-limb prostheses. The prosthesis Socket, a human-machine Interface, has to be designed properly to achieve satisfactory load transmission, stability, and efficient control for mobility. The biomechanical understanding of the interaction between prosthetic Socket and the residual limb is fundamental to such goals. The purpose of this paper is to review the recent research literature on Socket biomechanics, including Socket pressure measurement, friction-related phenomena and associated properties, computational modeling, and limb tissue responses to external mechanical loads and other physical conditions at the Interface. There is no doubt that improved biomechanical understanding has advanced the science of Socket fitting. However, the most recent advances in the understanding of stresses experienced at the residual limb have not yet led to enough clinical consensus that could fundamentally alter clinical practice. Efforts should be made to systematically identify the major discrepancies. Further research should be directed to address the critical controversies and the associated technical challenges. Developments should be guided to offer clinicians the quantification and visualization of the interaction between the residual limb and the prosthetic Socket. An understanding of comfort and optimal load transfer as patterns of Socket Interface stress could culminate in Socket design expert systems.
J H M Deckers - One of the best experts on this subject based on the ideXlab platform.
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effects of prosthesis alignment on pressure distribution at the stump Socket Interface in transtibial amputees during unsupported stance and gait
Clinical Rehabilitation, 2003Co-Authors: H A M Seelen, S Anemaat, H M H Janssen, J H M DeckersAbstract:Objective: To assess the effects of antero-posterior realignment of the prosthesis on pressure distribution at the stump/Socket Interface in unilateral transtibial amputees during unsupported stance and gait.Design: Cross-sectional group study.Setting: Outpatient rehabilitation clinic.Subjects: Seventeen unilateral transtibial amputees.Intervention: Antero-posterior prosthesis realignment using 0.5 cm heel or forefoot wedging.Measures: Pressure distribution changes at several sites at the stump/Socket Interface, expressed as peak pressure, peak pressure time, sustained submaximal load (MP80+) and time period of MP80+ (TP80+).Results: During stance, heel wedging led to a 30.4% decrease in mean pressure near the patella tendon and a 40.0% increase near the distal tibia site, whereas forefoot wedging led to a 30.0% decrease in pressure in the tibial end region. Antero-posterior ankle realignment did not lead to significant changes near the fibular head. During gait only heel wedging led to a 11.5% increase i...
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Effects of prosthesis alignment on pressure distribution at the stump/Socket Interface in transtibial amputees during unsupported stance and gait
Clinical rehabilitation, 2003Co-Authors: H A M Seelen, S Anemaat, H M H Janssen, J H M DeckersAbstract:Objective: To assess the effects of antero-posterior realignment of the prosthesis on pressure distribution at the stump/Socket Interface in unilateral transtibial amputees during unsupported stance and gait.Design: Cross-sectional group study.Setting: Outpatient rehabilitation clinic.Subjects: Seventeen unilateral transtibial amputees.Intervention: Antero-posterior prosthesis realignment using 0.5 cm heel or forefoot wedging.Measures: Pressure distribution changes at several sites at the stump/Socket Interface, expressed as peak pressure, peak pressure time, sustained submaximal load (MP80+) and time period of MP80+ (TP80+).Results: During stance, heel wedging led to a 30.4% decrease in mean pressure near the patella tendon and a 40.0% increase near the distal tibia site, whereas forefoot wedging led to a 30.0% decrease in pressure in the tibial end region. Antero-posterior ankle realignment did not lead to significant changes near the fibular head. During gait only heel wedging led to a 11.5% increase i...
Peter Vee Sin Lee - One of the best experts on this subject based on the ideXlab platform.
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An Investigation of Pressure Profiles and Wearer Comfort During Walking With a Transtibial Hydrocast Socket.
American journal of physical medicine & rehabilitation, 2019Co-Authors: Sheridan Laing, Noel Lythgo, Jim Lavranos, Peter Vee Sin LeeAbstract:ObjectiveThe aims of the study were to conduct an investigation of the transtibial hydrocast Socket Interface pressures during walking and to explore potential relationships between pressures experienced and resultant wearer comfort.DesignIn this cross-sectional study, pressure data at the limb and
H A M Seelen - One of the best experts on this subject based on the ideXlab platform.
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effects of prosthesis alignment on pressure distribution at the stump Socket Interface in transtibial amputees during unsupported stance and gait
Clinical Rehabilitation, 2003Co-Authors: H A M Seelen, S Anemaat, H M H Janssen, J H M DeckersAbstract:Objective: To assess the effects of antero-posterior realignment of the prosthesis on pressure distribution at the stump/Socket Interface in unilateral transtibial amputees during unsupported stance and gait.Design: Cross-sectional group study.Setting: Outpatient rehabilitation clinic.Subjects: Seventeen unilateral transtibial amputees.Intervention: Antero-posterior prosthesis realignment using 0.5 cm heel or forefoot wedging.Measures: Pressure distribution changes at several sites at the stump/Socket Interface, expressed as peak pressure, peak pressure time, sustained submaximal load (MP80+) and time period of MP80+ (TP80+).Results: During stance, heel wedging led to a 30.4% decrease in mean pressure near the patella tendon and a 40.0% increase near the distal tibia site, whereas forefoot wedging led to a 30.0% decrease in pressure in the tibial end region. Antero-posterior ankle realignment did not lead to significant changes near the fibular head. During gait only heel wedging led to a 11.5% increase i...
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Effects of prosthesis alignment on pressure distribution at the stump/Socket Interface in transtibial amputees during unsupported stance and gait
Clinical rehabilitation, 2003Co-Authors: H A M Seelen, S Anemaat, H M H Janssen, J H M DeckersAbstract:Objective: To assess the effects of antero-posterior realignment of the prosthesis on pressure distribution at the stump/Socket Interface in unilateral transtibial amputees during unsupported stance and gait.Design: Cross-sectional group study.Setting: Outpatient rehabilitation clinic.Subjects: Seventeen unilateral transtibial amputees.Intervention: Antero-posterior prosthesis realignment using 0.5 cm heel or forefoot wedging.Measures: Pressure distribution changes at several sites at the stump/Socket Interface, expressed as peak pressure, peak pressure time, sustained submaximal load (MP80+) and time period of MP80+ (TP80+).Results: During stance, heel wedging led to a 30.4% decrease in mean pressure near the patella tendon and a 40.0% increase near the distal tibia site, whereas forefoot wedging led to a 30.0% decrease in pressure in the tibial end region. Antero-posterior ankle realignment did not lead to significant changes near the fibular head. During gait only heel wedging led to a 11.5% increase i...
