Arthrokinematics

Question 1

What is arthrokinematics?

Answer 1

Motion occurring between joint articular surfaces

Question 2

Convex - concave joint relationship

Answer 2

improves fit and stability - Properly guides motion

Question 3

How do fundamental movements of arthrokinematics vary?

Answer 3

Depend on whether concave articular surface is moving on a fixed convex surface or vice versa

Question 4

Roll

Answer 4

Multiple points along one rotating articular surface contact multiple points on another articular surface
e.g. a tire rotating across a stretch of pavement

Question 5

Slide

Answer 5

Single point on one articular surface contacts multiple points on another articular surface
e.g., a stationary tire skidding across a stretch of icy pavement

Question 6

Spin

Answer 6

A single point on one articular surface rotates on a single point on another articular surface
e.g., a rotating toy top spinning on one spot on the floor.

Question 7

Convex on concave movement

Answer 7

The arthrokinematic roll (A) and the arthrokinematic slide (B)occur in opposite directions

Question 8

Concave on convex movement

Answer 8

The arthrokinematic roll (A)and the arthrokinematic slide (B) occur in the same direction

Question 9

Spin movement

Answer 9

Single point on one articular surface rotates on a single point on another articular surface
e.g., rotating toy top spinning on one spot on the floor
Always occurs about a central longitudinal axis of rotation