Dynamic Assessments: Lower Extremity Amputation Flashcards
What are prosthetic causes of excessive knee flexion?
Heel height too high, stiff heel cushion, excessive ankle dorsiflexion, socket too far anterior/foot too posterior, socket excessively flexed, prosthesis too long.
what phases of gait is excessive knee flexion a problem?
stance phase
IC, LR, MS, TS
Which of the following is NOT a prosthetic cause of excessive knee flexion?
a) Heel height too high
b) Socket positioned too far posteriorly
c) Excessive ankle dorsiflexion
d) Stiff heel cushion
Answer: b) Socket positioned too far posteriorly
A stiff ________ is a prosthetic cause of excessive knee flexion.
heel cushion
What anatomical factors contribute to excessive knee flexion?
Knee and/or hip flexion contracture, weakness of quadriceps, pain anteriorly in residual limb, poor balance.
Which anatomical cause is likely to increase excessive knee flexion in a patient with a prosthesis?
a) Strong quadriceps
b) Knee or hip flexion contracture
c) Heel height too low
d) Socket excessively extended
b) Knee or hip flexion contracture
What is the functional significance of excessive knee flexion?
Impaired shock absorption and increased demand on quadriceps to prevent further knee flexion
if the prosthetic ankle is aligned in _____ or ________, it will cause an anterior shift of the knee joint
DF
neutral with too high heel or too stiff
your patient is an amputee with increased heel height which causes him to compensate with a forward trunk lean. what are reasons this patient would compensate in that way?
decreased moment arm –> decreased torque –> decreased quad activation needed
which phase of gait is insufficient knee flexion problematic?
swing phase
What are prosthetic causes of insufficient knee flexion?
low shoe heel
soft heel cushion
excessive ankle PF
socket too far post./foot too far ant.
socket insufficiently flexed
Which of the following is NOT a prosthetic cause of insufficient knee flexion?
a) low shoe heel
b) stiff heel cushion
c) Excessive ankle PF
d) socket too far posterior
b - stiff heel cushion
What anatomical factors contribute to insufficient knee flexion?
weakness of quads
anterior-distal pain
inadequate gait training
Which anatomical cause is likely to lead to insufficient knee flexion in a patient with a prosthesis?
a) Strong quadriceps
b) anterior-distal pain
c) Heel height too low
d) proper gait training
b- anterior-distal pain
What is the functional significance of insufficient knee flexion?
reliance on body structures stance stability
insufficient shock absorption
if the prosthetic ankle is aligned in _____ or the AFO is aligned in _____w/___, it will cause knee hyperextension
PF
PF with too short heel or too soft
What are prosthetic causes of lateral/varus thrust at midstance?
excessive foot inset
low trim lines
poor M-L stability
Which of the following is NOT a prosthetic cause of lateral/varus thrust at midstance?
a) excessive foot inset
b) low trim lines
c) good M-L stability
c) good M-L stability
what are anatomical causes of latera/varus thrust at midstance?
proximal weakness
short residual limb
poor M-L stability