MSK Basic Exam and Intervention

Question 1

OKC screw home mechanism locking/knee extension

Answer 1

Tibia ER on femur

Question 2

OKC screw home mechanism unlocking/knee flexion

Answer 2

Tibia IR on femur

Question 3

CKC screw home mechanism locking/knee extension

Answer 3

Femur on tibia IR/medial rotation

Question 4

CKC screw home mechanism unlocking/knee flexion

Answer 4

Femur on tibia ER/lateral rotation

Question 5

Why is the screw home mechanism necessary?

Answer 5

Lateral femoral condyle is flatter, does not extend as far distally, projects further posteriorly, compared to medial condyle

Question 6

Scapular upward rotators

Answer 6

Upper part of trapezius
Serratus anterior
Lower part of trapezius

Question 7

Scapular downward rotators

Answer 7

Rhomboids
Levator scapulae
Pectoralis minor

Question 8

Achilles tendon repair

Answer 8

Weightbearing conventional approach: 6 weeks immobilized and NWB

Phase 1 (4-6 weeks)
- AROM of non-immobilized joints
- muscle setting of DF, invertors, evertors, PF (at 2 weeks)
- weightshifting in bilat stance while wearing orthosis (when PWB is permitted)

Question 9

Active insufficiency

Answer 9

The inability of a two joint muscle to shorten simultaneously at both joints

Muscle action

Question 10

Passive insufficiency

Answer 10

The inability of a two joint muscle to lengthen simultaneously at both joints

Muscle stretch

Question 11

Rules of active/passive insufficiency

Answer 11

Does not apply to single joint muscles

Active = muscle action
Passive = opposite of action/stretch

Question 12

Kinetic chain femoral anteversion

Answer 12

Hip IR
Tibial internal torsion
Subtalar pronation
Toe in
Squinting patellae

Question 13

Kinetic chain femoral retroversion

Answer 13

Hip ER
Tibial external torsion
Subtalar supination
Toe out
Frog-eyed patellae