FO posting responses
zach harvey
Description
Collection
Title:
FO posting responses
Creator:
zach harvey
Date:
4/23/2002
Text:
Thanks to all who responded. I plan on enlightening myself with some of
these resources for posting/ wedging of foot orthoses... Zach
____________________________________________________________________
Original question:
I am looking for information regarding the use of posting for foot
orthotics. I've done some reading but am still a bit confused as to how to
determine the degree of posting and when to post the forefoot vs. the rearfoot.
Obviously, the idea behind posting is to limit motion in order to protect the
foot, but I'm interested in knowing methods people are using to objectify this
process. I will post the results (no pun intended!).
Zach Harvey, CO
_Responses:____________________________________________________________
Do a search on Tom McPoil, he has done more research
on feet then anyone I know. I have heard him speak
several times and he is extremely well informed. He
also does research for Nike or Reboc.
Though it is by no means the last word on posting, you may want to take
the course (if it's still being offered) When the Foot Hits the
Ground, Everything Changes. It's a good intro into how to look at the foot
and what happens to different foot structures when they go from open to
closed chain. It's the basis for posting though they don't give a how
to on fabrication. They assume you will take the impressions, measure
the degrees needed, and send them off to a lab. I do have some problems
with their techniques because you don't know if the lab will interpret
your measurement the way you specify. If you do it yourself, you need to
figure out how to put the information into practice.
And, if I may, I'd like to suggest that FOs are Foot Orthoses or Foot
Orthotic Devices. I think our profession has fallen down on the job as
to allowing the name of our profession to be used to also name one
specific orthotic device without a peep of protest. The last time I looked
in Webster's, orthotic was still not listed as a noun.
Harold Anderson, CO
The posting of foot orthotics is not strictly scientific and there are
many rules of thumb in use. From an engineering perspective, the number
of degrees of rearfoot posting will depend on the width of the plantar
surface of the heel. Thus, the wider the heel the more wedging required to
achieve the same degree of posting.
As a basic rule: each 1 degree of posting corresponds to a wedge of
approximately 1/16 height. Although, I have also heard people use
1/8 height per degree. In order to be accurate I have always found it best
to specify posting in terms of wedge height (1/16, 1/8, 3/16,...)
instead of degrees. If you have any questions please feel free to call us,
Seamus Kennedy, C. Ped
Hersco Orthotic Labs
(718) 391 0416
¡¦When I did my clinical rotation at Trinity in Lewisville with Greg Small, C.O., he gave me a
copy of a book that was extremely helpful. It was titled A Practical Manual
For A Basic Approach to Foot Biomechanics by Dr. Sheldon Langer, D.P.M. and
Dr. Justin Wernick, D.P.M. It does a really good job of addressing the
post vs. wedge issue with both forefoot and hindfoot. I don't know where a copy
of this book can be found but it isn't long so I could copy it for you if
you would like it. The way that I have understood the posting forefoot vs.
rearfoot is as follows:
Evaluate the foot. If you have a forefoot that is in a
different plane that the rearfoot then a post can be used to reduce the deformity
caused by the compensation. That sounds confusing! If your forefoot
is 7 degrees inverted at subtalar neutral and your calcaneus is neutral then
upon weight bearing the forefoot will collapse and hyperpronate. Thus,
posting the forefoot 7 degrees will prevent the collapse and consequently
prevent hyperpronation. To do this, I would cast in subtalar neutral and
hopefully get the 7 degrees in the cast. Modify appropriately and then pull
polypropylene(etc.) with an extra strip of polypropylene over the
metatarsal heads. Afterwards, I would grind the extra material flat to achieve
the neutral rearfoot and 7 degree inverted forefoot. I hope this all made
sense and is what you were looking for. Good luck!!!!
Robbie
_________________________________________________________________________
It's a good question, but I thinks it's beyond the scope to this list.There so much material to discuss I don't know how to begin. Good luck! David Lindsey, C.O.
---------------------------------
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If you have a problem unsubscribing,or have other
questions, send e-mail to the moderator
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OANDP-L is a forum for the discussion of topics
related to Orthotics and Prosthetics.
Public commercial postings are forbidden. Responses to inquiries
should not be sent to the entire oandp-l list. Professional credentials
or affilliations should be used in all communications.
these resources for posting/ wedging of foot orthoses... Zach
____________________________________________________________________
Original question:
I am looking for information regarding the use of posting for foot
orthotics. I've done some reading but am still a bit confused as to how to
determine the degree of posting and when to post the forefoot vs. the rearfoot.
Obviously, the idea behind posting is to limit motion in order to protect the
foot, but I'm interested in knowing methods people are using to objectify this
process. I will post the results (no pun intended!).
Zach Harvey, CO
_Responses:____________________________________________________________
Do a search on Tom McPoil, he has done more research
on feet then anyone I know. I have heard him speak
several times and he is extremely well informed. He
also does research for Nike or Reboc.
Though it is by no means the last word on posting, you may want to take
the course (if it's still being offered) When the Foot Hits the
Ground, Everything Changes. It's a good intro into how to look at the foot
and what happens to different foot structures when they go from open to
closed chain. It's the basis for posting though they don't give a how
to on fabrication. They assume you will take the impressions, measure
the degrees needed, and send them off to a lab. I do have some problems
with their techniques because you don't know if the lab will interpret
your measurement the way you specify. If you do it yourself, you need to
figure out how to put the information into practice.
And, if I may, I'd like to suggest that FOs are Foot Orthoses or Foot
Orthotic Devices. I think our profession has fallen down on the job as
to allowing the name of our profession to be used to also name one
specific orthotic device without a peep of protest. The last time I looked
in Webster's, orthotic was still not listed as a noun.
Harold Anderson, CO
The posting of foot orthotics is not strictly scientific and there are
many rules of thumb in use. From an engineering perspective, the number
of degrees of rearfoot posting will depend on the width of the plantar
surface of the heel. Thus, the wider the heel the more wedging required to
achieve the same degree of posting.
As a basic rule: each 1 degree of posting corresponds to a wedge of
approximately 1/16 height. Although, I have also heard people use
1/8 height per degree. In order to be accurate I have always found it best
to specify posting in terms of wedge height (1/16, 1/8, 3/16,...)
instead of degrees. If you have any questions please feel free to call us,
Seamus Kennedy, C. Ped
Hersco Orthotic Labs
(718) 391 0416
¡¦When I did my clinical rotation at Trinity in Lewisville with Greg Small, C.O., he gave me a
copy of a book that was extremely helpful. It was titled A Practical Manual
For A Basic Approach to Foot Biomechanics by Dr. Sheldon Langer, D.P.M. and
Dr. Justin Wernick, D.P.M. It does a really good job of addressing the
post vs. wedge issue with both forefoot and hindfoot. I don't know where a copy
of this book can be found but it isn't long so I could copy it for you if
you would like it. The way that I have understood the posting forefoot vs.
rearfoot is as follows:
Evaluate the foot. If you have a forefoot that is in a
different plane that the rearfoot then a post can be used to reduce the deformity
caused by the compensation. That sounds confusing! If your forefoot
is 7 degrees inverted at subtalar neutral and your calcaneus is neutral then
upon weight bearing the forefoot will collapse and hyperpronate. Thus,
posting the forefoot 7 degrees will prevent the collapse and consequently
prevent hyperpronation. To do this, I would cast in subtalar neutral and
hopefully get the 7 degrees in the cast. Modify appropriately and then pull
polypropylene(etc.) with an extra strip of polypropylene over the
metatarsal heads. Afterwards, I would grind the extra material flat to achieve
the neutral rearfoot and 7 degree inverted forefoot. I hope this all made
sense and is what you were looking for. Good luck!!!!
Robbie
_________________________________________________________________________
It's a good question, but I thinks it's beyond the scope to this list.There so much material to discuss I don't know how to begin. Good luck! David Lindsey, C.O.
---------------------------------
Do You Yahoo!?
Yahoo! Games - play chess, backgammon, pool and more
********************
To unsubscribe, send a message to: <Email Address Redacted> with
the words UNSUB OANDP-L in the body of the
message.
If you have a problem unsubscribing,or have other
questions, send e-mail to the moderator
Paul E. Prusakowski,CPO at <Email Address Redacted>
OANDP-L is a forum for the discussion of topics
related to Orthotics and Prosthetics.
Public commercial postings are forbidden. Responses to inquiries
should not be sent to the entire oandp-l list. Professional credentials
or affilliations should be used in all communications.
Citation
zach harvey, “FO posting responses,” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 7, 2024, https://library.drfop.org/items/show/218789.
