11.2 Trans-tibial 2 Flashcards
Suspension types
- Supracondylar
- Suprapatellar
- Thigh corset and joint
- Sleeve
- Locking liner
- Cuff strap
- Waist belt
- Pin and shuttle
- Suction
- Vacuum assisted
How does the supracondylar suspension work?
Comes up high over the knee and grabs onto the sides of the femoral condyles
Supracondylar suspension provides ___ support
M/L
How might the supracondylar suspension get past the condyles?
- May have removable medial wall that reattaches
- Pad built into a flexible liner
Suprapatellar suspension
- Similar to supracondylar, but anterior trim line comes over patella
- Has a quadriceps bar
Components of a thigh corset and joint
- metal joint
- corset at top
- socket at bottom
advantages to thigh corset and joint
- M/L stability
- Leather has some rigidity and can absorb some of the compressive forces on the residual limb
- Good for short residual limb
Why would a corset and joint be good for a short residual limb?
- Doesn’t have a lot of surface to take weight
- Provides better dispersion of forces and stability
Sleeves are made of
neoprene
Sleeves go on the (inside/outside)
outside
Person puts on socket, then folds over their leg
What is a locking liner?
Liner is locked into the socket from the bottom
Does the cuff strap provide M/L stability?
no
Benefits to using a cuff strap suspension
Difficult to use a supracondylar suspension if they have excessive redundant tissue
Who typically gets a waist belt?
- low functioning people (often elderly)
- may not be able to have any constriction at the knee
What makes up a pin and shuttle suspension?
- ridged pin attaches to gel liner (same as locking liner)
- receptacle for pin built into socket (clicks into place)
- locked in until they push a release
Downsides to pin and shuttle suspension
- All weight of the prosthesis is being suspended from distal end of limb when they go into swing
- not good over time
Solution to pin and shuttle problems?
suction
What does suction combine?
- gel liner
- externally applied suction
suction: why is this effective?
- Don’t have the same mechanical problems as with pin and shuttle
- Limb hangs from more surface area of the residual limb
How is vacuum assisted suspension different from suction?
air is pumped out with an external force
Why would a pt with RA and impaired dexterity not want to use a vacuum assisted suspension?
- have to attach pump
- requires more dexterity than just using something like a locking liner
Why would a locking liner be best to use with an RA pt?
- can roll on liner
- use gravity (WB on limb) to lock in place
Which suspension types are not used very often?
- corset and joint
- waist belt
Which of these uses gel liner as the STANDARD?
- supracondylar
- pin and shuttle
- corset and joint
- waist belt
pin and shuttle
