Orthotics Lab 1 - Inframalleolar Orthoses (2/3/17) (2/6)

Question 1

difference between SMOs and IMOs

Answer 1

trimlines of SMOs extend above the malleoli, IMOs trimmed below malleoli

Question 2

what motions do IMOs control

Answer 2

pronation and supination

Question 3

primary and secondary forces with IMOs controlling supination

Answer 3

primary force: originating laterally near the talus, projecting medially

secondary force 1: originating medially, at the calcaneus projecting laterally

secondary force 2: originating medially, at the 1st met head projecting laterally

Question 4

primary and secondary forces with IMOs controlling pronation

Answer 4

primary: originating medially near the talus/navicular, projecting laterally

secondary 1: originating laterally near the calcaneus. projecting medially

secondary 2: originating laterally near the 5th met head, projecting medially

Question 5

what motions might an SMO control

Answer 5

supination, pronation, possibly plantarflexion (depending on posterior superior trimline)

Question 6

primary and secondary forces controlling plantar flexion for SMOs

Answer 6

primary: posterior/inferior directed force on the anterior tib

secondary 1:

secondary 2:

Question 7

would an IMO or SMO demonstrate greater triplanar control

Answer 7

SMO because increased vertical construction/dimension, there is greater leverage (increased lever arm length)

Question 8

would an IMO or SMO demonstrate greater PF control

Answer 8

SMO - the high posterior trimline is essential to set up a three point pressure system

Question 9

what are landmarks for partial footplate

Answer 9

they are trimmed just posterior to or right at the met heads

Question 10

what are landmarks for a full footplate

Answer 10

it extends out just past the toes

Question 11

when may a partial footplate be warranted

Answer 11

if the patient has active toe extension and is able to activate this motion through swing for adequate toe clearance

Question 12

when would a full footplate be warranted

Answer 12

if the patient lacks active toe extension for clearance through swing

Question 13

when is a semi-rigid or flexible footplate warranted

Answer 13

when the individual will be ambulating

Question 14

are there greater impact for IMOs or shoe modifications

Answer 14

with an IMO, corrections made are closer anatomically to the foot and have a greater impact