JII BCS Exam: Kinematic Knee! Quiz

14 Questions | By SmithNephew1 | Updated: Mar 17, 2022 | Attempts: 293

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1.

A study by Noble et al. (2005) concluded that patients who had TKA experience…
- A.
  
  Substantial functional impairment when compared with their age and gender matched peers
- B.
  
  Functional outcomes similar to that of their age and gender matched peers
- C.
  
  Substantial functional improvement when compared with their age and gender matched peers
- D.
  
  None of the above
2.

Which factors contribute to the rationale for a kinematic knee?
- A.
  
  Conventional knee designs do not replicate the normal anatomy of the knee and thus they are unable to restore normal kinematics and muscular efficiency
- B.
  
  Conventional knee designs do not provide the same levels of satisfaction and return to function as seen in THA
- C.
  
  The prevalence of younger more demanding patients
- D.
  
  All of the above
3.

A key characteristic to understand in relation to the native knee anatomy is that it is…
- A.
  
  Asymmetrical
- B.
  
  Symmetrical
- C.
  
  Convex on both sides
- D.
  
  None of the above
4.

When reviewing the articular geometry of the femur and tibia which of the following can be observed?
- A.
  
  The distal condylar radius of the medial femoral condyle is rounder than that of the lateral femoral condyle
- B.
  
  The distal condylar radius of the medial femoral condyle is flatter than that of the lateral femoral condyle
- C.
  
  The medial femoral condyle has a larger posterior offset than that of the lateral femoral condyle
- D.
  
  The lateral tibial condyle is concave in shape and the medial tibial condyle is convex in shape (no constraint on AP motion)
- E.
  
  The medial tibial condyle is concave in shape and the lateral tibial condyle is convex in shape (no constraint on AP motion)
5.

The knee is one of the most complicated joints in the body with six degrees of freedom.
- A.
  
  True
- B.
  
  False
6.

The articular geometry, in part, contributes to the kinematics of the knee during motion. Additionally, the articular geometry gives rise to a…
- A.
  
  1 degree joint line present in the normal knee
- B.
  
  5 degree joint line present in the normal knee
- C.
  
  3 degree joint line present in the normal knee
- D.
  
  None of the above
7.

In extension an angle is formed between the quadriceps and patella tendon, this angle is known as the ___ angle.
8.

The Q angle, which ranges from 14-17°, affects…
- A.
  
  Quadriceps efficiency
- B.
  
  The efficiency of flexor muscles
- C.
  
  Medial/lateral translation of the knee
- D.
  
  A & B
9.

In extension, the knee adopts the screw home position, which is a position of stability. In this position which of the following can be observed?
- A.
  
  Femur internally rotated 5° (achieved by ACL pull)
- B.
  
  Femur externally rotated 5° (achieved by ACL pull)
- C.
  
  Slightly more posterior femoral overhang
- D.
  
  Knee joint is more congruent and quadriceps activity is not required
- E.
  
  Quadriceps activity increases utilized to stabilize the knee
10.

Which of the following occurs during mid flexion (1-90°)?
- A.
  
  Automatic internal rotation of the femur out of the screw home position
- B.
  
  Automatic external rotation of the femur out of the screw home position
- C.
  
  Q-angle minimized to almost 0 degrees (increased quadriceps efficiency)
- D.
  
  The lateral femoral condyle is held in the concave tibial surface and the medial femoral condyle is free to move over the convex medial tibial surface. This results in a lateral pivot (rollback + femoral external rotation)
- E.
  
  The medial femoral condyle is held in the concave tibial surface and the lateral femoral condyle is free to move over the convex lateral tibial surface. This results in a medial pivot (rollback + femoral external rotation)
11.

Which of the following occurs during full flexion (90-155°)?
- A.
  
  Point of contact shifts anteriorly during flexion
- B.
  
  The femur rolls and slides simultaneously (posterior translation) to provide clearance with the posterior tibia and space for the tissue behind the knee to allow deep flexion
- C.
  
  Axial rotation retained (not needed anymore as Q angle is near 0 degrees)
- D.
  
  Point of contact shifts posteriorly during flexion
- E.
  
  Axial rotation continues until maximum extension is reached
12.

Satisfaction levels and return to functional activity following TKA are the same as that of THA.
- A.
  
  True
- B.
  
  False
13.

What paradoxical motion can occur as a result of conventional knee design?
- A.
  
  The lack of ACL function leads to paradoxical anterior sliding of the femur during flexion
- B.
  
  During flexion the knee may pivot laterally, as opposed to the naturally occurring medial pivot
- C.
  
  During flexion the knee may pivot medially, as opposed to the naturally occurring lateral pivot
- D.
  
  A & B
14.

Pitfalls of conventional knee design include?
- A.
  
  Asymmetrical femoral and tibial condyles, resulting in a 3° joint line
- B.
  
  No replication of ACL function of PS designs – lack of AP stability
- C.
  
  AP sulcus position is more posterior to allow deep flexion
- D.
  
  All of the above
- E.
  
  B & C