Orthotics

1. How many points of pressure are needed for proper control of a joint?
*2. During standing, where does the center of gravity pass with respect to the hip, knee, and ankle?
3. What are different materials used in fabrication of orthotics?
*4. What are thermoplastics?

Answers:
1. 3
2. Posterior to hip, anterior to knee and ankle.
3. Steel, aluminum, titanium, magnesium, leather, rubber, plastics.
4. Thermoplastics soften when heated and harden when cooled, so can be remolded. They can be shaped by body without need for a cast.