Convex-Concave Rules

Question 1

Convex Surface Moving on Concave Surface

Answer 1

• Roll and Slide occur in the OPPOSITE direction

- Mobilizing force should be applied in the opposite direction of the bone movement

Question 2

Concave Surface Moving on Convex Surface

Answer 2

• Roll and Slide occur in the SAME direction

- Mobilizing force should be applied in the same direction as the bone movement