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Summary (No. of gait loading cycles/year)

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  • Summary (No. of gait loading cycles/year)

    Dear Netters;

    My sincerest thanks to all of you who responded to my request for
    info on the number of gait loading cycles/year.

    my original request was
    >Dear Biomch-L readers,

    >We are interested in performing statistical analysis of the total number
    >of loading cycles per year on the hips and knees of males and females
    >during normal daily living. In this study we will include people from
    >different age groups and different occupations. We will also include total
    >hip and knee arthroplasty patients to measure the pre and post-operative
    >activity levels.

    >We would like to know if similar work has been done, or if there is another
    >research group doing such a work.

    >Thank you for any pointers!!

    >Hassan A. Serhan PhD
    >Asst. Prof. Ortho. Dept.
    >SUNY at Buffalo)

    ================================================== ================
    Here is a summary of the information I received:
    ================================================== ================

    From: Ed Lemaire

    Geoff Fernie has done some limb limb counting with
    amputees some time ago. He is at the U. of Toronto and/or
    Sunntbrook Hospital I think. Sorry but I don't have any more
    address info. The Hugh MacMillan Rehabilitation Center in
    Toronto would know how to reach him.

    Ed Lemaire, MSc
    The Rehabilitation Center
    Ottawa, Ontario, Canada
    613-737-7350 x5592


    From: "Ton van den Bogert"

    Dear Dr. Hassan,

    Several groups are working on activity monitoring
    using accelerometry, where accelerometer signals are recorded by a
    miniature datalogger (for a day, or a week) and analyzed
    afterwards. One of those groups is at the University of Twente
    (Netherlands). Contact: Dr. Peter Veltink .
    Those techniques are able to recognize certain types of activity,
    and also allow counting of the number of cycles.

    If you are interested in a more quantitative analysis of the hip
    joint, my own research may be relevant for you. I have developed
    a method, also using accelerometry, to quantify the magnitude of
    loading in the hip (not just the type of activity and the number
    of cycles). The instrumentation is more complex, however, so
    it's probably not suitable for activity monitoring. I used four
    triaxial accelerometers on the upper body. You might be able to
    use only two, one mounted at the lower back and one mounted
    higher up. This is the absolute minimum for estimation of 3-D
    linear and angular acceleration of the upper body.

    I can send you a copy of a publication, preferably by E-mail

    -- Ton van den Bogert
    Human Performance Laboratory
    University of Calgary


    From: Carol Oatis

    I believe work was done at Rancho Los Amigos Hospital, Downey California
    and the USC Department of Physical Therapy several years ago on steps per
    month in healthy subjects and in people with hip DJD. It may have been a
    Masters thesis by Patricia McElvey, back in the seventies. I don't know
    if it was ever published . Good luck


    From: Ton van den Bogert
    To: hassan serhan
    Subject: Re: No. of gait loading cycles/year

    You wrote:
    >In our initial study, we used electronic pedometers to simply count the
    >number of steps taken by the patients pre and pos-operatively. This data
    >will be used as a measure in the evaluation of THA and TKA.

    That is probably a good way to do this if walking is the main
    type of activity for your patients, i.e. you don't need to
    distinguish between different activities (walking, running,
    jumping etc.).

    >Ps. yes I'm interested in receiving a PS file of your paper, I think it

    I will E-mail the file. But, be aware that my application is
    quite unique. Most other applications of accelerometers for
    activity monotoring use heuristic, rather than mathematical,
    analysis to recognize and count activity cycles.

    -- Ton van den Bogert


    From: (Marco Viceconti)

    You can find info in "Materisl design analysis of the prosthetic anterion
    cruciate ligament", J Biomed Mat Res, 14, 1980, pp: 567-586. I think
    mostof the data they report is from:

    Grood, E.S.; Noyes, F.R. ==> J bone J surg 58A:8 1976 pp1083 1088.

    Hope this will help you


    Laboratorio di Tecnologia dei Materiali tel.39-51-6366865
    Istituti Ortopedici Rizzoli fax.39-51-6366863
    via di barbiano 1/10, 40136 - Bologna, Italy


    From: Kim Dwyer

    Dear Hassan, I am not aware of any research you might find useful, in
    fact I often wonder where exactly the figure "1million cycles/year" comes
    from---this is what lots of us who perform wear testing to examine
    polyethylene performance in total joint replacements use! Please keep me
    updated as your study progresses.
    One of our Resident's was interested in the amount of activity a
    patient with early rheumatoid arthritis performs on a daily basis. He
    provided pedometers for each patient that were about the size of a beeper
    and asked the patients to wear them every wakig hour for a month. The
    devices had their problems and the patients had their noncompliance
    problems but it was useful when averaged over a large enough group. Just
    an idea...
    Another interesting issue that someone suggested is that not only
    should we model the average speed at a particular joint and the
    number of cycles, etc., but we are missing te boat if we do not model the
    daily 'stumble, fall, etc." Someone said to go by our wear tester and
    hit it with a hammer every once in a while. This sounds pretty funny
    when you first hear it but over time it starts to make some sense
    (usually after you do something clumsy yourself :-D
    Good luck....

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
    Kimberly A. Dwyer, M.S. Clinical Mechanics Group
    Dwyer@ME.QueensU.Ca Mechanical Engineering
    Queen's University, Kingston, Canada
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~