Transfemoral Prosthetics Flashcards
(61 cards)
True or False:
We want to hold the femur in adduction (varus)
True
True or False:
It is easier to hold the femur in adduction (varus) with a longer femur (residual limb)
True
What is successful prosthetic management of transfemoral and knee disarticulation (4)
- Comfortable in containing the residual limb
- Stable during the stance phase of gait
- Smooth in transition to the swing phase of gait
- Acceptable in appearance
True or False:
We mostly make endoskeleton prosthesis due to ease of adjustment
True
What must the prosthetic team consider when selecting components of the transfermoral or knee disarticulation prosthesis (5)
- Weight
- Function
- Cosmesis
- Comfort
- Cost
True or False:
The most functional or technologically sophisticated components are also the heaviest, most expensive, most likely to need maintenance, and least cosmetic
True
True or False:
Longer residual limb makes recovery and potential better than a short residual limb
True
What happens to energy cost of gait as length of the residual limb decreases
Increases
True or False:
Individuals with a transtibial amputation walk 36% more slowly expending 2% more kilocal’s per min and 41% more kilocal’s per meter vs normal
True
True or False:
Individuals with a transfemoral amputation amputation walk 43% slower, energy cost is reflected as 5% more kilocals per min and 89% more kilocal’s per meter vs normal
True
True or False:
Increase in energy cost is manifested as an increased rate of oxygen consumption, elevated HR, and notable decrease in comfortable walking speed
True
What is a quadrilateral transfemoral socket design
4 distinct walls fashioned to contain thigh musculature with a flat posterior shelf for ischial weight bearing
What does the anterior wall of the quadrilateral socket design do
Creates a posterior counterforce at Scarpa’s triangle stabilizing the ischium on posterior shelf
What is an ischial containment transfemoral socket design
Stabilizes socket on the residual limb and controls socket rotation by containing the ischial tuberosity and ramus it also maintains femoral adduction and distributes pressure through socket along the shaft of the femur
Where is the quadrilateral socket narrow
A-P
Where is the ischial containment socket narrow
M-L
What is the goal of transfemoral socket design (3)
- Achieve comfort in weight bearing
- A narrow base of support in standing and walking,
- As close to normal swing phase as possible
What are the 2 socket options
- Hard socket
2. Flexible socket
How is the hard socket made
Thermoplastic or thermosetting resin
How does the hard socket fit
Intimate total contact fit worn with prosthetic sock as interface
What is the advantage to a hard socket (3)
- Very durable
- Easy to clean
- Less expensive
What is the disadvantage to a hard socket
More difficult to adjust fit on bony or sensitive residual limbs
How is the flexible socket made
Vacuum formed with flexible thermoplastic materials encased in a rigid frame
What is the advantage of the flexible socket (3)
- Accommodates to change in muscle shape
- Provides relief for bony prominences
- Comfort in sitting
