Orthotics KAFO & HKAFO Main

Question 1

Main purpose of single axis KAFO

Answer 1

• Provide medial/lateral stability
• Must have strong knee extensors

Question 2

Main purpose of polycentric axis free axis KO

Answer 2

Prevent knee hyperextension

Question 3

What is the main purpose of an off-set knee joint?

Answer 3

• Hold knee in extension
• Done by aligning knee joint behind the natural knee center
• Cannot be used with flexion contracture >10 degrees
• User must be able to extend hips to bring thighs backward and body weight forward

Question 4

Main purpose of single axis locking knee

Answer 4

• Provide stability in frontal and sagittal planes
• Used for quad weakness
• Keeps knee extended during stance and swing
• Manual lock by user

Question 5

How does the stance control knee joint work?

Answer 5

• During weight bearing, knee locking mechanism engages
• When unweighted, knee is allowed to flex during swing
• Can be adjusted to give different levels of resistance to flexion
• Must have 3/5 knee ext.