Alpha Liner Modifications
renardwc at ctrvax.Vanderbilt.Edu
Tue Aug 19 13:36:01 PDT 2003
This may not be your problem at all, but your symptoms sound very
I had a patient who experienced similar symptoms with frequent distal
failure of his liners. He was wearing 9mm Alpha Liners with locking
pins. I think I was able to successfully diagnose his problem, and
knock on wood, it has been resolved, without reinforcement of any
Ohio Willow Wood recommends fitting these liners without socks. This
is exactly what I did, a great no-sock fit. With this particular
patient however, edematous fluids build up during sleep. When he
would first donn his prosthesis in the AM, he was off the bottom of
the socket. Sometimes it was an inch or so until the fluid was pushed
out of his limb. It was such a problem I installed the longest pins
available to help engage the lock until he reached the socket bottom.
Big mistake. Pressure generated from the temporary void daily,
would pull the gel loose from the distal umbrella within a very short
period of time.
Solution: switching to a 3mm liner and stump socks. Now the liner is
correctly engaged at all times in the socket bottom, without voids,
as the fluid is pushed out he adds single ply as necessary.
Willow Wood advocates and I concur that voids of any kind facilitate
premature failure of gel within the liner. Durability is enhanced
dramatically by eliminating any and all voids.
Again, this may not be your problem, but on the outside chance it is,
I thought I'd mention it. If this isn't, best of luck with your
Kim L. Ruhl, CPO
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