2. Knee joint - clinical conditions Flashcards Preview

ESA 2 - MSK > 2. Knee joint - clinical conditions > Flashcards

Flashcards in 2. Knee joint - clinical conditions Deck (14)
Loading flashcards...
1

how would patella fragments displace after a fracture and why

- proximal fragment displaces superiorly due to quadriceps contraction
- distal fragment displaces inferiorly due to patellar ligament

2

why is patellar dislocation more common in women

greater Q angle

3

in which direction does patella usually dislocate

laterally

4

which structures conterbalance tendency towards lateral patella dislocation

1- medial, more horizontal pull of powerful vastus medialis

2- more anterior projection of lateral femoral condyle and deeper slope for larger lateral patellar facet

5

what is the most common knee joint pathology

collateral ligament injuries - caused by forces applied to side of knee when foot is fixed on ground and cannot move (knee often slightly flexed)

6

what can cause ACL tears

1- hyper-extension of knee joint (as is taught during extension)
2- application of large force to back of knee when knee slightly flexed

7

which test indicates an ACL tear

anterior drawer test: when hip and knee are flexed (P is supine), clinician can pull free tibia anteriorly

8

what can cause PCL tears

1- large force applied to shin when knee is flexed (e.g. dashboard injury)
2- hyper-extension of knee joint
3- damage to upper part of tibial tuberosity

9

which test indicates a PCL tear

posterior drawer test: when hip and knee are flexed (P is supine), clinician can push free tibia posteriorly

10

what is a frequent consequence of tibial/medial collateral ligament tearing

tearing of medial meniscus (as are firmly attached)

11

what are the 3 features of the 'unhappy triad'

1- torn ACL
2- torn medial collateral ligament
3- torn medial meniscus

12

what is knee locking and what are the 2 different types

knee stuck in 1 position, unable to flex or extend

1- true locking = mechanical block where something inside joint, e.g. meniscal tear or loose body, prevents mov.

2- pseudolocking = pain + muscle spasm

13

what is housemaid's knee

prepatellar bursitis, e.g. due to friction between skin and patella

14

what is clergyman's knee

superficial infrapatellar bursitis, e.g. due to friction between skin and tibial tuberosity