Patella Luxation

Question 1

what is the extensor mechanism?

Answer 1

tibial tuberosity
patella
quadriceps femoris muscles
trochlear groove

Question 2

what is the common problem that leads to patella luxation?

Answer 2

misalignment of the quadriceps/extensor mechanism

Question 3

how can patella luxation progress later in life?

Answer 3

cartilage wear
CCL rupture
trauma

Question 4

what is grade I patella luxation?

Answer 4

patella can be manually luxated with stifle in extension, but returns to normal position

Question 5

what is grade III patella luxation?

Answer 5

patella is luxated but can be reduced manually
spends more time out than in

Question 6

what is grade IV patella luxation?

Answer 6

patella is permanently luxated, cannot be reduced

Question 7

what are the rules of three for surgery on a patella luxation?

Answer 7

grade III luxation
3 episodes of lameness in a short period
3 week duration of lameness

Question 8

what is grade II patella luxation?

Answer 8

spontaneous luxation, non-painful signs of skipping
spends more time in than out

Question 9

are medial or lateral patella luxations more common?

Answer 9

medial
lateral can happen in large breeds

Question 10

how often are patella luxations bilateral?

Answer 10

50%

Question 11

what does a tibial tuberosity transposition do?

Answer 11

creates controlled fracture
can realign quadriceps mechanism

Question 12

who can a chondroplasty (cartilage flap, remove material below) be used in?

Answer 12

immature animals