Prosthetics Flashcards
Content: Basic Prosthetic Goals (3)
- Reestablish functional ambulation and ADLs
- Comfort
- Comestics
Content: Prosthetics Componenets (5)
- Socket Suspension
- Socket Interface
- Knee
- Pylon
- Foot
Q: What is the number one cuase of hip disarticulation?
Cancer
Q: What is a knee disarticulation preferred over a transtibial amputation?
With KD the natural end of the femur provides a WB surface AND the adductors are still naturally connected
T/F: Following a partial foot amputation, it is common to have higher level amputations within a few years.
True
Q: Why would a toe filler be added to a shoe following a toe, ray, or transmetatarsal amputation?
To improve push off
Term: Disarticulation of the tarsal and metatarsal bones
Lisfranc (partial foot) amputation
Term: Foot disarticulated between the talonavicular and calcaneocuboid joints
Chopart (partial foot) amputation
Q: What are the negative functional outcomes associated with Lisfranc and Chopart amputation? (2)
- Increased PF contracture over time
- Negative impact on skin integrity over distal end
Q: How does prosthetic foot height affect gait?
The higher the prosthetic foot height, (or the more room left for a prosthetic foot) the more energy return from the prosthesis which can improve gait effeciency
Q: What is done with pediatric patients to address prosthetic foot height?
Commonly bone growth is stopped surgically to allow for a WB distal end and provide increased potential for foot height and prosthetic options in the future
T/F: The longer the lever arm, the higher the pressure at the terminating point and the more force required to move the prosthesis.
False, shorter the lever arm
Q: Foot prosthesis requires replacement of the _____ __________ for support. Needs to come up to the _______ to reestablish _______ _____.
toe, rocker, leg, push, off
Content: Ankle Disarticulation (3)
- Affects talocrural joint - shave malleoli and reposition fat pad of heel
- WB is possible
- Often results in leg length discrepancy
Q: Which prothesis is typically used to address ankle disarticulation?
(Mid-)Patellar Weight Bearing - to replace levers from fot must extend device up the tibial shaft
Q: What is the most common lower extremity amputation level?
Transtibial
Content: As residual tibial length decreases… (3)
- Ipsilateral knee extensors work harder
- SA for WB decreases
- Discomfort & irritation within prosthesis may increase
Q: What is the ideal transtibial length and why?
6-8 inches from mid patellar tendon
- Long enough lever to control prosthesis
- enough soft tissue for WB
- enough room for prosthesis components (increased functionality)
Q: What issues arise with a transtibial amputation that is 13-14 inches in length from the mid patellar tendon (3)
- WB on the thinnest part of the tibia
- Don’t have much soft tissue to pull over residual limb
- Less room for prosthetic components
T/F: The shorterthe residual limb, the less additional bracing required.
False: more bracing further up the chain for support
Content: Four factors that vary the design of transtibial prostheses?
- Length of residual limb
- Sense of proprioception
- Inherent control
- Activity level
Content: Knee Disarticulation (3)
- Long lever arm
- Adductors intact
- WB end possible
Content: Advantages of Knee Disarticulation Prosthesis (3)
- Lower proximal trim lines
- Good WB
- Long intact femur
Content: Problems with Knee Disarticulation Prosthesis (4)
- Unequal knee center/tibial plateaus
- Sitting/squating can be difficult
- Sitting with limited knee space
- Altered swing phase
