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Biomech 4 midterm 2 > Knee 5 > Flashcards

Flashcards in Knee 5 Deck (30):
1

What happens to the medial and lateral menisci with internal rotation?

Medial- rotates anterior and is more prominent in anterior part of the medial joint line. Lateral- moves posterior and deepr within the joint thus the lateral joint line deepens. MORE PRESSURE IS EXERTED ON THE MEDIAL MENISCUS WITH INTERNAL ROTATION.

2

What happens to the medial and lateral menisci with external rotation?

Medial- joint deepens. Lateral- rotates anterior into the anterolateral joint line. PRODUCES MORE PRESSURE ON THE LATERAL MENISCUS.

3

Abnormal movements of the menisci with fixation leads to what?

Meniscal tears.

4

How can you prevent abnormal movements of the menisci with fixation?

Adjustments.

5

What is the stress test that will test for movements/changes with VARUS and VALGUS?

Bohlers test.

6

How is VARUS tested?

Pinches medial meniscus and tractions lateral meniscus thru coronary ligaments.

7

How is the VALGUS test done?

Pinches lateral meniscus and tractions medial meniscus thru medial collateral and coronary ligaments.

8

The potential for injury with the menisci is with what movement?

Any movement and creates a snap.

9

What are the common mechanisms of injury for the menisci?

Deep flexion, hyperextension, external rotation and valgus stress.

10

What is the old unhappy triad?

A severe knee injury involving damge to the medial meniscus, ACL, and MCL.

11

What is the new unhappy triad?

A severe knee injury involving damge to the medial meniscus, ACL, and LCL.

12

What is the healing of menisci like?

Poor healers since they are made of fibrocartilage and are mostly avascular.

13

What is the blood flow like to the menisci?

Mainly avascular besides the outer 1/3 in young and healthy. If older and not healthy the outer menisci is more fibrous.

14

Where will nutrients for the menisci come from?

Synovial fluid.

15

What part of the menisci is most poorly supplied with blood?

Central portions especially the posterior horns.

16

What is the innervation of the menisci like?

Outer part of meniscus with pain and proprioception @ junction with deep capsule.

17

What happens to the menisci with age?

decreased vascularization, increased wear and tear, increased friability.

18

Name the two collateral ligaments and both of their names?

Medial collateral ligament (MCL) aka tibial collateral ligament (TCL), Lateral collateral ligament (LCL) aka Fibular collateral ligament (FCL).

19

What ligament is posterior to the LCL?

Poplitiofibular ligament (PFL).

20

Where will the LCL attach to?

Lateral femoral epicondyle and fibular head.

21

The LCL primarily resists what?

Varus stress.

22

what are the 2 sprain mechanisms of the LCL?

Large varus stress and hyperextension.

23

Where will the MCL attach to?

Medial femoral epicondyle and medial tibial condyle and shaft.

24

The MCL primarily resists what?

Valgus stress.

25

What are the 2 sprain mechanismis of the MCL?

Valgus stess and hyperextension.

26

Which ligament is larger the LCL or MCL?

Medial is larger.

27

Which ligament is damaged more the LCL or MCL?

MCL.

28

What will medial and lateral rotation do to the collateral ligaments?

medial- decreases tension on them. Lateral- increases tension on them.

29

What are the 3 parts to the posteromedial capsular complex of the knee?

1. Posterior part of MCL. 2. Semimembranosis tendon and tendon expansion. 3. Oblique popliteal ligament.

30

What will the posteromedial capsular complex of the knee resist?

Hyperextension, anterior translation, valgus stress, extremes of lateral tibial rotation.