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The Effect Of Prosthesis Suspension On Residual Limb Pistoning

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Securable pistoning finger prosthesis - Techmedica, Inc.

Surgical treatment of diseased Metacarpophalangeal joint normally use silicone-based prosthesis as joint replacement. Even though mobility is restored to the joint, there have been reports of complications associated with implant instability and wear. In this study, two commercially available silicone prostheses for metacarpophalangeal joint replacement - the Swanson and the Neuflex - were reconstructed and analysed using three dimensional finite element analysis. Computed tomography dataset of the middle finger was used to construct the joint and a load was applied to the proximal interphalangeal joint to simulate flexion. An inhouse experimentally validated algorithm was used to calculate and display interface micromotion between the implant and the bone. Results showed high stress field at the hinge of both implants, with pistoning behaviour of the stems relative to the bone canals. The Neuflex prosthesis had larger stress magnitudes at the hinge, and flexed more than the Swanson for the same magnitude of flexion load. Due to the flexibility of the Neuflex, the pistoning behaviour during flexion was less than the Swanson.

Gait deviations in amputees - Physiopedia

Dual energy x-ray absorptiometry DEXA scans were taken of thesubjects' limb in the prosthesis under three different loading conditions to determine theamount of pistoning.

Rehab & Prosthetics - Basic Science - Orthobullets

The prosthesis feels lighter to the wearer because it is always with them with no possibility of pistoning or movement within the socket.

N2 - Surgical treatment of diseased Metacarpophalangeal joint normally use silicone-based prosthesis as joint replacement. Even though mobility is restored to the joint, there have been reports of complications associated with implant instability and wear. In this study, two commercially available silicone prostheses for metacarpophalangeal joint replacement - the Swanson and the Neuflex - were reconstructed and analysed using three dimensional finite element analysis. Computed tomography dataset of the middle finger was used to construct the joint and a load was applied to the proximal interphalangeal joint to simulate flexion. An inhouse experimentally validated algorithm was used to calculate and display interface micromotion between the implant and the bone. Results showed high stress field at the hinge of both implants, with pistoning behaviour of the stems relative to the bone canals. The Neuflex prosthesis had larger stress magnitudes at the hinge, and flexed more than the Swanson for the same magnitude of flexion load. Due to the flexibility of the Neuflex, the pistoning behaviour during flexion was less than the Swanson.

AB - Surgical treatment of diseased Metacarpophalangeal joint normally use silicone-based prosthesis as joint replacement. Even though mobility is restored to the joint, there have been reports of complications associated with implant instability and wear. In this study, two commercially available silicone prostheses for metacarpophalangeal joint replacement - the Swanson and the Neuflex - were reconstructed and analysed using three dimensional finite element analysis. Computed tomography dataset of the middle finger was used to construct the joint and a load was applied to the proximal interphalangeal joint to simulate flexion. An inhouse experimentally validated algorithm was used to calculate and display interface micromotion between the implant and the bone. Results showed high stress field at the hinge of both implants, with pistoning behaviour of the stems relative to the bone canals. The Neuflex prosthesis had larger stress magnitudes at the hinge, and flexed more than the Swanson for the same magnitude of flexion load. Due to the flexibility of the Neuflex, the pistoning behaviour during flexion was less than the Swanson.

18B: Prosthetic Management | O&P Virtual Library

Figure A demonstrates a swing-to gait pattern of ambulation with an assistive device

Pistoning - When a liner stretches so that the stump elongates – or the vertical motion of a residual limb inside a prosthetic socket

Designed with the user in mind, the ALPS Extreme Prosthetic Liner is the perfect fit for transfemoral and active transtibial amputees. The Extreme offers 80% less vertical stretch than our other gel liners, which allows users to experience more control and stability during increased activity. This liner is formulated with ALPS GripGel or High Density Gel, which both contain properties that help facilitate the donning process as well as reduce pistoning and bunching behind the knee.

The War Amps - Living With Amputation
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  • EVALUATION OF THE MAGNITUDE OF PISTONING ..

    Resources - NZALS

  • The magnitude of pistoning motion of …

    NZALS provides a range of different resources including posters, fact sheets, jargon buster and FAQ's

  • PubMed - National Center for Biotechnology Information

    Fact Sheet

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