Foundations Lecture Flashcards
What is an orthosis?
Externally applied device used to modify the structural or functional characteristics of the neuromuscular system
External appliance worn to restrict or assist motion or to transfer load from one area to another
What is the general function of a static orthosis?
Allows for motion to occur and support joint alignment
What is the general function of a dynamic orthosis?
Assist with a motion
What is a splint?
Temporary device that only has static properties
What is a CO?
Certified orthotist
What is a CPO?
Certified orthotist prosthetist
What is the primary indication to use an orthosis?
Improve function
What are the five main ways to improve function with an orthosis?
- Immobilize and protect weak, painful, or healing body region
- Relieve pain by limiting ROM and weight bearing
- Reduce axial load
- Prevent or correct a deformity
- Enhance motor control function
What are the three ways to improve comfort?
Maximize contact, make sure the fit is snug, leverage
What is the effect of changing the length of the lever?
As the lever arm increases, the forces decrease and disperse over a greater surface area with can increase comfort
What forces can be controlled with an orthosis?
Tension, compression, shear, torsion, ground reaction force
What system controls tensile and compressive forces?
Three-point pressure system
What is a three-point pressure system?
Involves a primary force on one side that is counterbalanced by two secondary forces on the opposite side both proximally and distally
What are the three forces involved in valgus prevention at the knee?
- Primary force applied medially and directed laterally at the joint line
- Secondary force applied laterally at the proximal thigh and directed medially
- Secondary force applied distally at lateral leg and directed medially
What are the three forces that control plantarflexion while wearing an orthosis?
- Primary force originates anteriorly at the ankle strap and is directed posterior and inferior
- Secondary force originates posteriorly at the superior trim line and is directed anteriorly
- Secondary force originates inferior from the orthosis at the MPT and is directed superiorly