Axial rotation for 332 pounder
Rick
Description
Collection
Title:
Axial rotation for 332 pounder
Creator:
Rick
Date:
9/19/2013
Text:
Good day list!
Does anyone know of an axial rotation option for a 332 lb, 6'1 gentleman with a TTA & a long history of dysfunctional gait due to 25 years of various surgical attempts at limb salvage. Someone put him in a HD Harmony which he reports being unable to tolerate & refused to use it... so a week after receiving the device, the prosthetist just disconnected it...leaving this gentleman lugging the extra weight around, no valve, a gel knee sleeve & limb pistoning. Oh, & he absolutely crushes the vertical shock in the unit. I digress...
We have discovered that he needs the axial rotation available in the harmony due to no pelvic rotation & odd trunk movement from years a habitual & compensatory movements. Every tube clamp arrangement tried ends up with the prosthetic foot internally rotated & huge genu varus moment. The torque in his biomechanics from mid-stance on prosthetic side to initial swing just overwhelms the tube clamps and the foot internally rotates. Using a fused clamp on proximal or distal end of the pylon...the other clamp turns. Tried same manufacture tube & clamps, varied manufacturers tubes & clamps, HD products & always torqued to spec's. Tried roughing up the non-fused end of the tube (tough to get into/out of clamp), but still turns.
The gentleman suggested spot welding the clamps to the tube, but then he'll have a static prosthetic situation resulting in all his torsional forces affecting him proximally. Not an option.
Any ideas would be greatly appreciated.
Thank you.
Rick
Rick Milen, CPO, PTA
NEXSTEP, Inc.
Prosthetic Specialists
West Lawn, PA
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Does anyone know of an axial rotation option for a 332 lb, 6'1 gentleman with a TTA & a long history of dysfunctional gait due to 25 years of various surgical attempts at limb salvage. Someone put him in a HD Harmony which he reports being unable to tolerate & refused to use it... so a week after receiving the device, the prosthetist just disconnected it...leaving this gentleman lugging the extra weight around, no valve, a gel knee sleeve & limb pistoning. Oh, & he absolutely crushes the vertical shock in the unit. I digress...
We have discovered that he needs the axial rotation available in the harmony due to no pelvic rotation & odd trunk movement from years a habitual & compensatory movements. Every tube clamp arrangement tried ends up with the prosthetic foot internally rotated & huge genu varus moment. The torque in his biomechanics from mid-stance on prosthetic side to initial swing just overwhelms the tube clamps and the foot internally rotates. Using a fused clamp on proximal or distal end of the pylon...the other clamp turns. Tried same manufacture tube & clamps, varied manufacturers tubes & clamps, HD products & always torqued to spec's. Tried roughing up the non-fused end of the tube (tough to get into/out of clamp), but still turns.
The gentleman suggested spot welding the clamps to the tube, but then he'll have a static prosthetic situation resulting in all his torsional forces affecting him proximally. Not an option.
Any ideas would be greatly appreciated.
Thank you.
Rick
Rick Milen, CPO, PTA
NEXSTEP, Inc.
Prosthetic Specialists
West Lawn, PA
********************
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 affiliations should be used in all communications.
Citation
Rick, “Axial rotation for 332 pounder,” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 2, 2024, https://library.drfop.org/items/show/235558.
