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Lew Prosthetic Locking Device

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Last Updated: 21 November 2020

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General | Latest Info

Suspension systems are necessary components of lower limb prostheses as they help to ensure secure coupling between residual and prosthetic limbs. Proper fit of stump inside prosthetic socket and appropriate selection of prosthetic suspension have positive effects on amputee gait, and can decrease energy consumption during ambulation-. Symmetry between limbs represents healthy gait and is one of the primary objectives of rehabilitation for lower limb amputees. The gait pattern of person with lower limb amputation is not as symmetrical as that of healthy individuals in terms of ground reaction force, time, distance of walking and joint angles,. Among these parameters, GRF is defined as the percentage of body weight applied to limb during the stance phase of gait and force that is generated for forward propulsion. Bateni et al. Report that there was a higher range of motion in hip and knee on the prosthetic side than sound limb in transtibial amputees during walking. Moreover, step length was longer than sound limb due to shorter stance time on the prosthetic side. In rehabilitation of lower limb amputees, one of the main goals is to improve amputees ' gait pattern so that it appears as similar to the gait of healthy individuals as possible. As such, many researchers have used three-dimensional motion analysis to investigate gait parameters of transtibial amputees during different activities using various prosthetic components,. Therefore, gait analysis system might be used as a diagnostic tool to make decisions for rehabilitation protocols. Suspension systems play fundamental roles in prosthetic function and patients satisfaction. Silicone liners with total surface bearing socket are the most favorable form of suspension system as they provide better suspension, fit, and function during ambulation when compared with more traditional systems, such as patellar tendon bearing socket with Pelite liners-. Prosthetic suspension using Seal-in liner and valve can improve socket fit and decrease pistoning movement within socket more successfully than pin / Lock system with Dermo liner-. Recently, Bruneli et al. Report that seal-in liner cause reduction in energy cost of walking compared with suction socket and sleeve, especially when walking on slope. Furthermore, amputees could walk faster with the Seal-in suspension system, although no statistical significance was observe. Amputees are generally more satisfied with the pin / Lock system due to the ease with which liner can be don and doff compared with Seal-in liner. Base on literature, only a few studies evaluated the effects of different transtibial suspension systems on gait performance-. To the author's knowledge, no study has previously compared the effects of these two suspension systems on amputees gait performance. The main purpose of this study was to compare effects of two suspension systems on various gait parameters in unilateral transtibial amputees during level walking. The main hypothesis of the study was that suction socket has a positive influence on amputees gait performance, especially at first peak GRF.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Methods

Suction-When residual limb is seated inside a socket, expulsion valve that expels air without return is used Suction is achieved with the use of seal in the gel liner or suspension sleeve. More advanced systems can include vacuum suction systems that expel with more force than that of expulsion valve. Pin lock or locking mechanism-locking gel liner is Use for this mechanism. It allows pins that protrude at the end of liner that engage lock mechanism. Once locked in place, prosthesis will remain locked until disengaged by release lever thigh corset and knee joints-typically seen for use in shorter below knee residual limbs due to lack of stability, but serve as a suspension option without use of waist strap and gives tight circumferential wrap round thigh Cuff suspension strap-Use of fork strap that wrap around bony prominences of bottom or distal end of femur. Capture of bone allows the strap to rest on once the prosthesis is lifted off the ground. Self-suspending sockets-this is the use of higher medial / lateral trim lines that can, if needed for more stability, include a knee cap. This system also captures over bony landmarks of the distal end of femur. This system does not require straps or additional component. A prosthetist will make selection of the best below knee suspension system. Each suspension system will usually have a pro and con and should be discussed in detail with treating practitioner on which suspension system is best for you.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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