Orthotics overview

Question 1

What are some general purposes of orthotics?

Answer 1

• Provide stability
• Limit movement
• Replace a lost motion
• Enhance motion

Question 2

Characteristics of an “ideal” orthosis

Answer 2

• Function
• Comfort
• Cosmetic
• Fabrication
• Cost

Question 3

Why is comfort important for an orthotic?

Answer 3

Should be able to worn for a long time without compromise to pt’s skin

Question 4

What is primary force?

Answer 4

Force directed at the pivot point to influence a joint motion

Question 5

What is counter force?

Answer 5

Force in the opposite direction of primary force to provide resistive forces to the primary force

Question 6

What should a patient be educated on about their orthotic?

Answer 6

• Wear time/tolerance - 30 minutes then gradually increase
• Signs of improper fit
• Skin inspection
• Sock or other interface use
• Care of device (don’t leave in hot car)
• Expected changed in effectiveness and efficiency during functional mobility

Question 7

3 reasons

An orthotic is most comfortable and effectives when:

Answer 7

1. Forces distributed over large surface areas to minimize pressure on skin and soft tissue
2. Forces are applied in a way that a large moment arm reduces the amount of force needed to control the joint
3. The sum of primary and counter-forces of each control system equals zero