Biomechanics

Question 1

Open chain pronation

Answer 1

Everson, DF, abduction (EDAb)

Question 2

Open chain supination

Answer 2

Inversion, PF, Add (IpAd)

Question 3

Closed chain pronation

Answer 3

Eversion, PF, Add (EPAd)

Question 4

Closed chain supination

Answer 4

Inversion, DF, Abd (IDAb)

Question 5

Convex rule

Answer 5

Roll and glide opposite

Question 6

Concave rule

Answer 6

Concave = same. Roll and glide in same direction

Question 7

Grading for joint mobilizations

Answer 7

Grade 1: small amp (pain)
Grade 2: large amp (pain)
Grade 3: large amp (pain free)
Grade 4: small amp (pain free)
Grade 5: thrust (pain free)

Question 8

Jayda’s cross syndrome (muscle imbalance)

Answer 8

Deep neck flexor W ➡️ Lower trap/ Serratus anterior W
SCM/pecs T ➡️ UT/levator T

Abs W ➡️ glutes W
Hip flexor T ➡️ beck ext T

Question 9

Screw home mechanism

Answer 9

Tibia rotates laterally on femur when extending during OPEN CHAIN (TOLL)

Question 10

During closed chain, how does the femur move on top of tibia?

Answer 10

Medial rotation of femur on tibia to lock (going into standing)
Lateral rotation of femur on tibia to unlock (going into sit or squatting)

Question 11

Shoulder upward rotation

Answer 11

Serratus anterior, lower trap, upper trap (SALT, UT)

Question 12

Shoulder downward rotation

Answer 12

Levator scap, rhomboid, pec minor (I Luv Rho-min)

Question 13

Active insufficiency

Answer 13

The inability of a 2-joint muscle to shorten at both joints

Question 14

Passive insufficiency

Answer 14

The inability of a 2 joint muscle to lengthen at both joints