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Knee Kinematics > Gap Balancing > Flashcards

Flashcards in Gap Balancing Deck (54):
1

Use a smaller femoral component

 

Tight in Flexion 

You are increasing flexion space 

2

Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface. 

It is a case of tight in flexion and ok in extension .

By using distal augment you have reduced the flexion space and made it equal to flexion space (tight in flexion space )

3

Use a Smaller Femoral Component

Tight in Flexion 

4

Use an offset stem to move the femoral component anteriorly

Tight in Flexion

5

Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface 

Tight in Flexion

6

Resect additional distal femoral bone 

Tight in extension

7

Use a distal femoral Augment

Loose in Extension

8

Use an offset stem to move the femoral component anteriorly

Tight in Flexion 

9

Use a distal femoral augment to move the femoral component distally 

Loose in extension or to reduce extension space so that it is equal to flexion space  and a thinner poly can be used 

10

Use an offset stem to move the femoral component posteriorly .

Loose in Flexion 

11

Use Posterior augments

Loose in Flexion 

12

Use a larger femoral component

Loose in Flexion 

13

Resect additional distal femoral bone 

Tight in Extension 

14

Use a larger femoral component 

Loose in Flexion 

15

Use posterior femoral  Augments

To componsate the large femoral component which would must have been used for large flexion space 

16

Use an offset stem to move the femoral component anteriorly 

Tight in flexion 

17

What will a smaller femoral component do ?

Increase the flexion space 

18

When you use an offset stem to move the femoral component anteriorly what does it do ?

Increase flexion space 

19

Use an offset stem to move the femoral component anteriorly.

 

Increasing flexion space 

20

Loose in Extension and Tight in Flexion 

Q image thumb

  1. Use an offset stem to move the femoral component anteriorly and use a thicker polyethylene articular surface. 
  2. Use a thicker polyethylene articular surface and use a smaller femoral component. 

A image thumb
21

Loose in Extension & Tight in Flexion

Q image thumb

  1. Use an offset stem to move the femoral component anteriorly and use a thicker polyethylene articular surface. 
  2. Use a thicker polyethylene articular surface and use a smaller femoral component. 

 

A image thumb
22

Tight  in Extension & OK in Flexion

Q image thumb

Resect additional distal femoral bone and move the femoral component proximally.

A image thumb
23

Losse in Flexion and Tight in Extension  

Q image thumb

  1. Resect additional distal femoral bone and use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Resect additional distal femoral bone and use a larger femoral component. Use posterior femoral augments. 

A image thumb
24

Loose in Flexion and Tight in Extension 

Q image thumb

  1. Resect additional distal femoral bone and use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Resect additional distal femoral bone and use a larger femoral component. Use posterior femoral augments. 

A image thumb
25

Tight in Flexion and OK  Extension 

Q image thumb

  1. Use an offset stem to move the femoral component anteriorly.
  2. Use a smaller femoral component
  3. Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface. 

A image thumb
26

Tight in Flexion and OK  Extension 

Q image thumb

  1. Use an offset stem to move the femoral component anteriorly.
  2. Use a smaller femoral component
  3. Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface. 

A image thumb
27

Tight in Flexion and  OK in Extension 

Q image thumb

  1. Use an offset stem to move the femoral component anteriorly.
  2. Use a smaller femoral component
  3. Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface. 

A image thumb
28

OK in Extension and Loose in Flexion 

Q image thumb

  1. Use an offset stem to move the femoral component posteriorly. Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Use a larger femoral component.Use posterior femoral augments.

A image thumb
29

Loose in Flexion and Ok in Extension 

Q image thumb

  1. Use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Use a larger femoral component Use posterior femoral augments.

A image thumb
30

Loose in Flexion and Ok in Extension 

Q image thumb

  1. Use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Usealargerfemoral component. Useposterior femoral augments.

A image thumb
31

Loose in Extension and TIght in Flexion 

Q image thumb

  1. Resect additional distal femoral bone and use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.
  2. Resect additional distal femoral bone and use a thicker polyethylene articular surface. 
  3. Resect additional distal femoral bone and use a larger femoral component. Use posterior femoral augments. 

A image thumb
32

Ok in Flexion and Loose in Extension 

Q image thumb

Use a distal femoral augment. 

A image thumb
33

Tight in Flexion and Tight in Extension  

 

Q image thumb

Use a thinner Poly or Rescet More Tibia

A image thumb
34

Loose in Extension and Loose in Flexion 

Q image thumb

  • Use a thicker polyethylene articular surface. 

A image thumb
35

Resect additional distal femoral bone and use an offset stem to move the femoral component posteriorly.Use posterior femoral augments.

Loose in flexion and Tight in Extension 

36

Resect additional distal femoral bone and use a thicker polyethylene articular surface. 

Loose in flexion and Tight in Extension 

37

Use an offset stem to move the femoral component anteriorly and use a thicker polyethylene articular surface. 

Tight in Flexion and Loose in Extension

38

Resect additional distal femoral bone and use a larger femoral component. Use posterior femoral augments. 

Loose in flexion and Tight in Extension 

39

Use a thicker polyethylene articular surface and use a smaller femoral component. 

Tight in Flexion and Loose in Extension

40

Resect additional distal femoral bone and move the femoral component proximally. 

Tight in Extension and OK in Flexion

41

Use a distal femoral augment. 

Ok in Flexion and Loose in Extension

42

Use an offset stem to move the femoral component anteriorly.

Tight in Flexion and  Ok in Extension 

43

Use a smaller femoral component

Tight in Flexion and  Ok in Extension 

44

Use a distal femoral augment to move the femoral component distally and use a thinner polyethylene articular surface. 

Tight in Flexion and  Ok in Extension 

45

• Use an offset stem to move the femoral component posteriorly.
• Use posterior femoral augments.

Loose in Flexion and Ok in Extension 

46

Resect additional distal femoral bone and use a thicker polyethylene articular surface. 

Loose in Flexion and OK in Extension

47

• Use a large femoral  component.
• Use posterior femoral augments.

Loose in Flexion and OK in Extension

48

Use a thinner Poly or Rescet More Tibia

Tight in Extension and Tight in flexion 

49

Use a thicker polyethylene articular surface

Loose in Extension and Losse in Flexion  

50

Larger and Smaller Femoral Component dictates

the Flexion Space

If the flexion space is tight use a smaller component and if the flexion space is loose use a bigger femoral component

51

Posterior Femoral Augments affects

the flexion space

52

Distal femoral arguments affects

the extension space

53

When flexion space is loose

Use Offset stem to move femur posteriorly and use femoral posterior augments

54