Basics (WHICH YOU WILL UNDERSTAND!!!!)

Question 1

Convex-concave

Answer 1

Convex rolls and slides in opposite directions
Maintains articular surface + Jt capacity through ROM

Question 2

Force coupling

Answer 2

Rotating force around a pivot point
Multiple forces at any given moment
Can be equal or unequal, depending on function required
Moving elements (muscles) and stabilising elements (ligaments) can influence this

Question 3

Form closure

Answer 3

Stability of Jt or body segment based on congruence between articulating surfaces
Congruency
Containment
Interlocking

Question 4

Force closure

Answer 4

Muscle or external factors to maintain stability
Tension/compression
Muscle activation
External factors (inc stability)

Question 5

Concave-convex

Answer 5

Concave surface rolls and slides in same direction
Helps maintain Jt congruity and articular surface through ROM

Elbow- flex/ext
Concave- ulnar
Convex- humerus
Humerus= passive
Ulnar + radius= active