PLC

Question 1

What are the 3 layers?

Answer 1

ITB
Patellar retinaculum
Everything else in between

Question 2

Deep layer (6)

Answer 2

FCL (lat)
Arcuate ligament
Popliteo-fibular ligament (PFL)
Fabulous-fibular ligament (FFL)
Popliteus muscle and tendon
Joint capsule

Question 3

FCL: attachments

Answer 3

Proximal/posterior femoral condyle

Distal/anterior styloid-fibula

Question 4

FCL: F to failure

Answer 4

750N

Question 5

FCL vs ACL F to failure:

Answer 5

ACL is 2200N

Question 6

Popliteofibular ligament: attachments

Answer 6

83 deg to M attachment - popliteus

Distal/anterior styloid-fibula

Question 7

PFL: F to failure

Answer 7

400N

Question 8

LCL vs PFL F to failure

Answer 8

LCL is stronger (750 vs 400)

Question 9

PFL variations:

Answer 9

67.4% anterior

Question 10

Popliteus: attachments

Answer 10

Proximal to popliteal fossa-lateral femur

Posterior/medial-tibia

Question 11

What is hallmark imaging (MRI) sign to dx damage to PLC?

Answer 11

Popliteus involvement

Question 12

Test for popliteus integrity?

Answer 12

Unlocking the knee from full ext/ER to IR and flexion

Question 13

Arcuate ligament: attachments

Answer 13

Lat aspect of capsule-proximal

Posterior fibular head