Responses, lightest knee
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Title:
Responses, lightest knee
Text:
Hello all,
A while back I posted a question for the LISTSERV regarding a light weight
knee for use in a pair of purely cosmetic AK prostheses. I appreciate very
much all the responses. A short explanation of what we ended up doing is
followed by the original post and the responses received.
Initially the thought the using an upper extremity endoskeletal elbow sounded
appealing but after consulting with other colleagues and the technical
advisors at Otto Bock I decided to give regular old PVC pipe a try. I
fashioned the knees (quite easily really) from a few fittings and a couple of
bolts. The hip joint ended up being a short piece of rope. The sockets were
actually a single monolithic polyethylene anterior shell (made from a cast of
his torso) with a lightweight cotton webbing belt. Short pieces of 30 mm
pylons were glued to the 3/4 inch PVC with epoxy (this took a little tooling
down of the PVC). A tube clamp, sach foot adapter, the Otto Bock light duty
sach foot and foam covers were used. They came out much, much lighter and,
according to the patient, much more comfortable than the prostheses he has
used over the past 30 years. Thanks again!
Eddie White, CP
Beacon Prosthetics and Orthotics
3911 New Bern Ave.
Raleigh NC 27610
Original post:
I have a client with very short bilateral transfemoral amputations. He is
having new prostheses built and is looking for them to be as light as
possible. They will be for cosmetic purposes only, no weight bearing
capabilities required. I am looking for the lightest knee with an adjustable
friction available, pediatric or otherwise. Any suggestions will be
appreciated.
Responses:
try an endoskeletal elbow joint, those are very light
******
As long as weight bearing or even transfers won't be attempted you may want
to consider Otto Bock's endoskeletal arm components.(see page 3.92 in arm
component catalog) They make a very light weight locking elbow that can be
flexed and locked in a variety of positions.
*********
Bauerfeind Prosthetics offers a variety of light-weight knee joints you
might want to look at:
The pediatric modular monocentric knee features an internal extension
assist and weighs 150 g. Rated to 100 lbs Art. No. G-3P56
The ipos Single Axis knee with manual lock weighs only 280 g. Rated up
to 220lbs Art No. 010353
The Proteval Single Axis free knee has an adjustable extension assist
and weighs 270 g. Rated up to 220 lbs. Art. No. 3.1.2130
You can view all these products by going to
www.bauerfeind-prosthetics.com and downloading the complete catalog
(pdf.file)
***********
You may wish to talk to Alin Aulie, of Aulie Devices.
<URL Redacted> Though his web site does not show this product
he manufactures a two bar nylon knee that is very light. I myself used one
of these for 2.5 years. Worth the call.
**********
give some thought to an all plastic using the removal foam technique with the
Otto Bock exo 3K9 and 1S19 foot.
*********
If he is not weight bearing, do the knees have to bend? If they do not have
to bend then use PVC piping covered with a foam cover. If the knees have to
bend then use the endoskeleton elbow from Otto Bock . It locks in different
positions. As far as attaching the feet, If you use PVC piping the gunk a T
nut to the inside of the pipe. You could do the same thing for the Otto
Bock endoskeleton system.
********
Why on earth do you need adjustable friction? We once built a very
serviceable pair of cosmetic legs using 1/2 aluminum shelving channel and
brass cabinet hinges. If you must have friction control look into using an
endoskeletal elbow joint.
********
Try the Geolite by OWW
********************
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.
A while back I posted a question for the LISTSERV regarding a light weight
knee for use in a pair of purely cosmetic AK prostheses. I appreciate very
much all the responses. A short explanation of what we ended up doing is
followed by the original post and the responses received.
Initially the thought the using an upper extremity endoskeletal elbow sounded
appealing but after consulting with other colleagues and the technical
advisors at Otto Bock I decided to give regular old PVC pipe a try. I
fashioned the knees (quite easily really) from a few fittings and a couple of
bolts. The hip joint ended up being a short piece of rope. The sockets were
actually a single monolithic polyethylene anterior shell (made from a cast of
his torso) with a lightweight cotton webbing belt. Short pieces of 30 mm
pylons were glued to the 3/4 inch PVC with epoxy (this took a little tooling
down of the PVC). A tube clamp, sach foot adapter, the Otto Bock light duty
sach foot and foam covers were used. They came out much, much lighter and,
according to the patient, much more comfortable than the prostheses he has
used over the past 30 years. Thanks again!
Eddie White, CP
Beacon Prosthetics and Orthotics
3911 New Bern Ave.
Raleigh NC 27610
Original post:
I have a client with very short bilateral transfemoral amputations. He is
having new prostheses built and is looking for them to be as light as
possible. They will be for cosmetic purposes only, no weight bearing
capabilities required. I am looking for the lightest knee with an adjustable
friction available, pediatric or otherwise. Any suggestions will be
appreciated.
Responses:
try an endoskeletal elbow joint, those are very light
******
As long as weight bearing or even transfers won't be attempted you may want
to consider Otto Bock's endoskeletal arm components.(see page 3.92 in arm
component catalog) They make a very light weight locking elbow that can be
flexed and locked in a variety of positions.
*********
Bauerfeind Prosthetics offers a variety of light-weight knee joints you
might want to look at:
The pediatric modular monocentric knee features an internal extension
assist and weighs 150 g. Rated to 100 lbs Art. No. G-3P56
The ipos Single Axis knee with manual lock weighs only 280 g. Rated up
to 220lbs Art No. 010353
The Proteval Single Axis free knee has an adjustable extension assist
and weighs 270 g. Rated up to 220 lbs. Art. No. 3.1.2130
You can view all these products by going to
www.bauerfeind-prosthetics.com and downloading the complete catalog
(pdf.file)
***********
You may wish to talk to Alin Aulie, of Aulie Devices.
<URL Redacted> Though his web site does not show this product
he manufactures a two bar nylon knee that is very light. I myself used one
of these for 2.5 years. Worth the call.
**********
give some thought to an all plastic using the removal foam technique with the
Otto Bock exo 3K9 and 1S19 foot.
*********
If he is not weight bearing, do the knees have to bend? If they do not have
to bend then use PVC piping covered with a foam cover. If the knees have to
bend then use the endoskeleton elbow from Otto Bock . It locks in different
positions. As far as attaching the feet, If you use PVC piping the gunk a T
nut to the inside of the pipe. You could do the same thing for the Otto
Bock endoskeleton system.
********
Why on earth do you need adjustable friction? We once built a very
serviceable pair of cosmetic legs using 1/2 aluminum shelving channel and
brass cabinet hinges. If you must have friction control look into using an
endoskeletal elbow joint.
********
Try the Geolite by OWW
********************
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
“Responses, lightest knee,” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 5, 2024, https://library.drfop.org/items/show/219510.
