Eddy,
Too many variables to answer directly…TSB socket design? hybrid of a ptb
tsb? Type of liner being used? Tissue type? A general value I have
determined over the years is for my socket design a 3mm reduction equals
about a one ply reduction. I would like to know what responses you receive.
Thanks.
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I don’t know any, and I had make me the same question, if you found some
please let me know.
Greetings !
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Hi Eddie,
What I usually do is taking the plaster positive mould of the patient,
taking measurements at several points without the sock, and then do the same
at the same points with the socks around the mould. Then it’s a matter of
comparing the circumferences and reducing accordingly.
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3mm circ per ply is the value I was taught.
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It can’t be done as a straight percentage Eddy. The cross-sectional area of
the sock is a fixed value, whereas the cross-sectional area of the limb is a
variable.
If you looked at a cross-section of a limb as a perfect circle, the most
accurate way to reduce the volume would be to reduce the diameter by about
3mm for 3-ply, or 4mm for 5-ply.
For example, if the limb circumference is 220 mm:
220/pip
70-6d
64*pi 1
220/201=1, or roughly a 10% reduction.
For a limb circumference of 320 mm:
302/pi 2
102-6–
96*pi01
320/301=06, or roughly a 6% reduction.
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Please forward me the the responses from your list serve question. Thanks.
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There is no formula that I know of and depending on what brand of sock
because they all vary in thickness. My guess is about 3% for a 5ply stretch
sock.
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No known formula. % changes with the circumference. for example, 5% of 10″
is .5″ reduction. 5% of 15″ is a .75″ reduction. 5% of 20″ is a 1.0″
reduction.
I can tell you the difference of a 3mm liner & 6 mm liner is 8-10 ply,
depending on tissue firmness (density).
Eddy Leopoldo Fuentes, C.P.O.
CLINICAL DIRECTOR
Diabetic Solutions, Corp.
Urb. Flamboyan Calle 3 D9
Manati, PR 00674
Office Phone: 1-787-884-3382
Fax: 1-787-854-2000
Cel. 1-787-317-7525
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