the knee joint Flashcards Preview

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Flashcards in the knee joint Deck (19):
1

what three bones make up the knee joint?

femur
patella
tibia

2

which muscle causes unlocking of the knee?

popliteus muscle - laterally rotates the femur

3

what is the popliteal fossa?

the space at the back of the knee - contains the popliteal artery

4

what are the menisci?

2 c-shaped wedges of fibrocartilage
they increase joint congruency and help shock absorption
assist in locking mechanism

5

which meniscus is attached to the tibial collateral ligament?

the medial lemniscus is attached to the tibial collateral ligament

6

what are the ligaments inside the knee?

the anterior and posterior cruciate ligaments

7

what are the ligaments outside the knee?

fibular and tibial collateral ligaments

8

where does the posterior cruciate ligament attach?

the posterior intercondylar region of tibia and travels superoanterally to the medial femoral condyle

9

where does the anterior cruciate ligament attach?

the anterior intercondylar region of tibia and superoposteriorly to the lateral femoral condyle

10

which cruciate ligament is weakest?

the anterior cruciate ligament

11

what is the function of the posterior cruciate ligament?

prevents posterior displacement of the tibia
PREVENTS HYPERFLEXION

12

what is the function of the anterior cruciate ligament?

PREVENTS HYPEREXTENSION
prevents anterior displacement of the tibia

13

which ligament prevents hyeprflexion?

posterior cruciate ligament

14

which ligament prevents hyperextension?

the anterior cruciate ligament

15

what is the function of medial (tibial) collateral ligament?

prevent abduction of leg at knee

16

what is function of lateral (fibular) collateral ligament?

prevent adduction of leg at knee

17

What is the unhappy triad?

ANTERIOR CRUCIATE + MEDIAL COLLATERAL + MEDIAL MENISCUS = UNHAPPY TRIAD

caused by excessive lateral twisting or blow to lateral sides of extended knee
the medial lemniscus tears due to it being attached to the medial collateral which tears

18

what is gene varum?

bow legs

19

what is genu valgum?

knock knee