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3DGA ankle marker placement for prosthetic feet

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  • 3DGA ankle marker placement for prosthetic feet

    Dear BIOMCH-L members,
     
    I would like remind that a few years back Tam Nguyen had also posted responses to
    BIOMCH-L  related to similar matter,, resembling to Miss Jenny Kent recent
    responses. to subject line
     

    Re: [BIOMCH-L] Help: 3DGA ankle marker placement for prosthetic feetTuesday,
    February 12, 2008 3:15 PM
    From: "Rabinder Sahni" Add sender to ContactsTo: "Tam
    Nguyen"

    Dear Tam
     
    I do not consider 3DGA ankle marker to be a crucial factor.
    I view  complete prosthetic  foot as an inverted offset "T" into consideration. 
    Hence an adjustable pyramid (ankle) location may ease the alignment  process.
     
     
    The below mentioned points should be considered in selecting a prosthetic foot
    1) Location of pyramid (ankle) with respect to length of foot.
    2) Length of foot  with reference to sound foot in case of unilateral BK amputees.
    3) Stiffness of fore foot as well heel damper.
     
    Answers to your question mentioned below.
     
    1)      ( NOT CRITICAL)
     
    2)      ( ADJUSTABLE PYRAMID ANKLE TOWARDS FORE OR REAR FOOT        
                ADVISED)
     
    3)      (CERTAINLY  RIGHT WITHOUT IGNORING OTHER POINTS)
     
     
    Thanks
     
    Mr.Rabinder Sahni
    Prosthetics R&D, Designer lower limbs, Self user
    INDIA
    Tam Nguyen wrote:
    Dear all,
    We are about to begin a study looking at the functional performance between
    three prosthetic feet (SACH, dynamic and multi-axial)using 3D gait analysis
    in our VICON equipped laboratory. We found the following articles with
    description of the ankle marker placement as on the spot corresponding to
    the lateral malleolus on the unaffected side.
    * Sjodahl et al. Kinematic and kinetic gait analysis in the sagittal plane
    of trans-femoral amputees before and after special gait re-education.
    Prosthet Orthot Int 2002; 26: 101-112
    * Bateni and Olney. Effect of weight of prosthetic components on the gait of
    tran-tibial amputees. JPO 2004; 16(4):113-120

    We also found a few similar articles but the authors did not specify the
    location of the ankle maker placement. We want to make sure that maker
    placements are appropriately placed to represent the function of the feet
    design and to avoid potential errors in the kinematics and kinetics
    measurements. So our questions are:

    1. Is there a standard maker placement for prosthetic feet study?
    2. What would be the reasons for choosing the same spot to the lateral
    malleolus on the unaffected side?
    3. Would it be more accurate to place the maker where the approximate ankle
    joint centre/ axis of rotation is located? (As these locations are
    definitely different within the three feet designs and certainly are
    different from the unaffected side)
    Look forward to your responses and will post a summary.
    Regards,

    Tam Nguyen
    Manager, South Australian Movement Analysis Centre
    Department of Rehabilitation & Aged Care
    Repatriation General Hospital
    Daws Rd, DAW PARK, SA 5041
    Australia
    e: tam.nguyen@rgh.sa.gov.au
    t: +61 8 8275 2848
    f: +61 8 8275 1130
    ---------------------------------------------------------------
    Information about BIOMCH-L: http://www.Biomch-L.org
    Archives: http://listserv.surfnet.nl/archives/Biomch-L.html
     
     
     
     

    Re: [BIOMCH-L] Help: 3DGA ankle marker placement for prosthetic feetTuesday,
    February 12, 2008 3:15 PM
    From: "Rabinder Sahni" Add sender to ContactsTo: "Tam
    Nguyen"

    Dear Tam
     
    I do not consider 3DGA ankle marker to be a crucial factor.
    I view  complete prosthetic  foot as an inverted offset "T" into consideration. 
    Hence an adjustable pyramid (ankle) location may ease the alignment  process.
     
     
    The below mentioned points should be considered in selecting a prosthetic foot
    1) Location of pyramid (ankle) with respect to length of foot.
    2) Length of foot  with reference to sound foot in case of unilateral BK amputees.
    3) Stiffness of fore foot as well heel damper.
     
    Answers to your question mentioned below.
     
    1)      ( NOT CRITICAL)
     
    2)      ( ADJUSTABLE PYRAMID ANKLE TOWARDS FORE OR REAR FOOT        
                ADVISED)
     
    3)      (CERTAINLY  RIGHT WITHOUT IGNORING OTHER POINTS)
     
     
    Thanks
     
    Mr.Rabinder Sahni
    Prosthetics R&D, Designer lower limbs, Self user
    INDIA
    Tam Nguyen wrote:
    Dear all,
    We are about to begin a study looking at the functional performance between
    three prosthetic feet (SACH, dynamic and multi-axial)using 3D gait analysis
    in our VICON equipped laboratory. We found the following articles with
    description of the ankle marker placement as on the spot corresponding to
    the lateral malleolus on the unaffected side.
    * Sjodahl et al. Kinematic and kinetic gait analysis in the sagittal plane
    of trans-femoral amputees before and after special gait re-education.
    Prosthet Orthot Int 2002; 26: 101-112
    * Bateni and Olney. Effect of weight of prosthetic components on the gait of
    tran-tibial amputees. JPO 2004; 16(4):113-120

    We also found a few similar articles but the authors did not specify the
    location of the ankle maker placement. We want to make sure that maker
    placements are appropriately placed to represent the function of the feet
    design and to avoid potential errors in the kinematics and kinetics
    measurements. So our questions are:

    1. Is there a standard maker placement for prosthetic feet study?
    2. What would be the reasons for choosing the same spot to the lateral
    malleolus on the unaffected side?
    3. Would it be more accurate to place the maker where the approximate ankle
    joint centre/ axis of rotation is located? (As these locations are
    definitely different within the three feet designs and certainly are
    different from the unaffected side)
    Look forward to your responses and will post a summary.
    Regards,

    Tam Nguyen
    Manager, South Australian Movement Analysis Centre
    Department of Rehabilitation & Aged Care
    Repatriation General Hospital
    Daws Rd, DAW PARK, SA 5041
    Australia
    e: tam.nguyen@rgh.sa.gov.au
    t: +61 8 8275 2848
    f: +61 8 8275 1130

    Information about BIOMCH-L: http://www.Biomch-L.org
    Archives: http://listserv.surfnet.nl/archives/Biomch-L.html
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