Q1: TT Socket Designs Flashcards
Suspension
holds the prosthesis on the residual limb
Interface
- contacts skin
- Materials used between limb and socket
Socket
contains, supports, and protects the residual limb
Shank/construction
maintains spatial relationship between socket and foot
Protective Covering
pr
provides protection of components from environmental elements; often custom shaped
Foot/ankle/other
transfers and absorbs ground reaction forces
Socket Functions
- serve as rigid attachment to distal components
- facilitate energy/force transfer between the patient and the ground
- protect residual limb from damaging pressures and impact forces
TRUE OR FALSE
Increasing the support area decreases pressure on skin
TRUE
Open ended socket design
- no distal end contact
- combined with joint and corset to provide weight bearing and suspension
Verrucous Hyperplasia
Progression:
1. Edema
2. Verrucous hyperplasia
3. cancer risk if left untreated
Why was distal limb contact introduced
- to reduce factors that led to excessive edema and verrucous hyperplasia
PTB Socket Design Loading Principles
- Total contact
- Specific weight bearing
- anterior-posterior compression with high posterior brim
PTB-SC Varient
- supracondylar
- indications: anatomical (supracondylar) suspension; ML knee joint stability
PTB-SCSP Varient
- supracondylar-suprapatellar
- high trim line over patella
- quadriceps bar
- limits knee hyperextension in late stance phase
What is an indication fot PTB-SC design
- short residual limbs
- ligamentous laxity (ML instability)
Hydrostatic Socket Theory
- introduced for TF
- based on hypothesis that if the soft tissues of AK stump are adequatley sipported in a suitably shaped container they will behave under load as an elastic solid with low stiffness
Total Surface Bearing Design
- developed in order to enable use of skin fit suction suspension
- clear test socket: improved ability to evaluate intimacy and accuracy of socket fit
Total Contact
- all area of limb have some contact but weight bearing areas can be altered to increase or decrease loads
Total Surface Bearing
pressue is distributed more equally across the entire surface of RL
Exoskeletal Shank
- external support structure
- structural strength is derived from external shell of shank
- inside of shank may be hollow or solid
Exoskeletal Advantages
- strength
- durability
- less exposed componentry
- customization of thickness
Exoskeletal Disadvantages
- alignment not adjustable
- lack of modularity
Endoskeletal Shank
- internal support structure
- pylon
- can add protective cover
Endoskeletal Advantages
- modularity
- adjustability
- patient preference
- component selection bigger
Endoskeletal Disadvantages
- higher strength requires heavier or more $$ components
- reduced durability
- exposed componentry
