Prosthetics Flashcards
what is a ray amputation?
disarticulation of the toe and its associated metatarsal
what are lisfranc and chopart disarticulations?
lisfranc = removal of metatarsals chopart = further proximal, through tarsal bones
what three things happen as transtibial residual length decreases?
knee extensors work harder, weight bearing becomes harder, skin irritation gets worse
transtibial design varies based upon what 4 things?
activity level, length of residual, inherent (knee) control, proprioception
what is the ideal length of transfemoral amputation
3 cm proximal to knee
why do you lose stability of femur as residual limb length decreases?
loss of adductor muscles
rehab timeline for rigid device, temporary device, preparatory prosthesis and definite prosthesis
Rigid device w/in 24 hours of surgery
Temp training device 2-4 wks
Prep prosthesis 4-8 wks
Definite 6-12 mo
4 variables specific to the residual limb
condition of the skin, stability of remaining joints, muscle strength, ROM
Pressure tolerant areas
patella tendon, lateral shaft of fibula, gastroc, pretrial areas
pressure intolerant areas
tibial crest, fibular head, hamstring tendons, distal patella, distal end of fibula
Functional K levels 0-4
0: no ambulation, no prosthetic
1: transfers and ambulation on level surfaces, limited/unlimited household ambulation
2: low-level environmental barriers and fixed cadence, limited community ambulatory
3: variable cadence, traverse most environmental barriers, demand beyond simple locomotion
4: exceeds basic ambulatory skills, high impact/stress during activity, children and active adults or athletes
what would you see if anterior bumper and posterior bumper were too tight?
anterior – drop off
posterior – knee buckle
what is the most popular fit prosthetic knee in the US
stance control
What PAVET score is indicated for a microprocessor knee?
above a 39
