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Ortho Boards > Arthroplasty > Flashcards

Arthroplasty Flashcards

1
Q

Soft tissue releases in a valgus knee

A

Flexion - popliteus
Extension - IT band
Both - LCL

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2
Q

Soft tissue releases in varus knee

A 
tibial osteophyte removal
deep MCL
posteromedial corner
attachment of the semimembranosus
partial superficial MCL
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3
Q

Risks of HO following TKA

A

male
trauma
obesity
increased osteophyte formation

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4
Q

Initial implant for a charcot knee

A

hinged

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5
Q

polyethylene wear rates associated with loosening

A

0.1 mm per year

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6
Q

common complication in patients with sickle cell undergoing THA

A

femoral canal perforation

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7
Q

what effect does TKA have on your golf game

A

improves your handicap

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8
Q

position for hip arthrodesis

A

5deg ER
0 deg Add
20 degrees flexion

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9
Q

number one reason for failure of low friction charnley

A

acetabular failure

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10
Q

what is the only advantage to a smaller incision for THA

A

cosmesis

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11
Q

Risk factors for sciatic nerve palsy

A 
DDH
female
revision
limb lengthening
post traumatic OA
surgeon self-rating the procedure
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12
Q

cell involved in metal on metal debris

A

lymphocytes

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13
Q

drains are associated with

A

increased risk of transfusion

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14
Q

AAOS bone loss acetabulum

A 
1 - segmental
2 - cavitary
3 - both
4 - seperation between superior and inferior acetab
5 - arthrodesis
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15
Q

groin pain following THA

A

psoas tendonistis

cortisone injection
release if normal component
revise acetabular component

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16
Q

risk factors for HO THA

A

prolonged surgery
soft tissue handling
male
heterotrophic OA

need to wait 6 months following procedure to do resection

17
Q

best predictor of transfusion post-op

A

low HgB

18
Q

indications for revision MOM

A 
component loosing
progressive osteolysis
large effusion
pseudotumor
unremitting pain
19
Q

risk factors for dislocation following THA

A 
female
AVN
fracture treated with tHA
inflammatory OA
> 70yo
20
Q

indications for PS

A

patellectomy
PCL gone
inflammatory OA

easier to balance
more ROM
easier exposure

21
Q

advantage of mobile bearing

A

in theory reduces strain on polyethelene

22
Q

difficulty with posterior referencing in a valgus knee

A

internal rotation of the femoral component

23
Q

what will lead to increased Q angle

A 
internal rotation of the femur
internal rotation of the tibia
lateralizaiton of the patella
medialization of the femur
medialization of the tibia
24
Q

where should you center your tibial component

A

over the medial 2/3 of the tubercle

25
Q

normal angles of the knee

A

distal femur - 6 deg valgus
tibia - 3 deg varus
posterior condyles - 3 deg IR

need to neutralize all these angles when you do your cuts
6 deg off femru
3 deg off tibia
3 deg ER from posterior condyles (be careful of hypoplastic lateral condyle in vaglus knee)

26
Q

benefits of UKA compared to osteotomy

A 
faster rehabilitation and quicker recovery
improved cosmesis
higher initial success rate
fewer short-term complications
lasts longer
easier to convert to a TKA
27
Q

complications of UKA

A

stress fracture - high level of activity

tibial compoenent loosening - will see on XR

28
Q

compare lateral UKA to medial UKA

A

the same

29
Q

factors associated with elevated metal ion levels in MOM

A

cup abduction > 55

small femoral head

30
Q

Strong AAOS recommendations for arthritis of hip or knee

A

weight loss
physical activity
NSAIDS
tramadol

31
Q

what form of wear is most important in osteolysis

A

adhesive wear

32
Q

main determinant in the number of particles created

A

volumetric wear

related to the size of the head - increased head is increased wear

33
Q

factors increasing POLY wear

A

un-cross linked

thickness

34
Q

compare wear properties

A

poly - > 0.1 is associated with osteolysis, macrophage
ceramic - best wear, stripe wear
Metal - smaller particles, lower than poly, lymphocytes

35
Q

risk factors for supracondylar periprosthetic fractures

A 
Rheumatoid arthritis
Parkinson's disease
chronic steroid therapy
osteopenia
female gender
36
Q

risk of tibial periprosthetic fractures

A

prior tibial tubercle osteotomy
component loosening
component malposition
insertion of long-stemmed tibial components

Ortho Boards (9 decks)

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