JII BCS Exam: Knee Design And Function! Quiz
- 1.
Which TKA system was the first ‘guided-motion’ kinematically accurate knee design on the market?
- A.
Triathlon CR
- B.
Vanguard PS
- C.
JOURNEY BCS (JBCS)
- D.
ADVANCE Medial-Pivot Knee
Correct Answer
C. JOURNEY BCS (JBCS)Explanation
The JOURNEY BCS (JBCS) was the first 'guided-motion' kinematically accurate knee design on the market. This suggests that this particular knee design incorporated a guided-motion system that accurately replicated the natural movement of the knee joint. The other options, Triathlon CR, Vanguard PS, and ADVANCE Medial-Pivot Knee, do not have the same distinction of being the first 'guided-motion' kinematically accurate knee design.Rate this question:
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- 2.
Which of the following statements regarding the JBCS knee system are true?
- A.
Over 40,500 JBCS knees have been implanted globally by over 250 surgeons. 2300 of these were implanted in Australia
- B.
Over 65,000 JBCS knees have been implanted globally by over 600 surgeons. 3346 of these were implanted in Australia
- C.
The global full market release took place in March 2006 at the AAOS where it won the most innovative product award
Correct Answer(s)
B. Over 65,000 JBCS knees have been implanted globally by over 600 surgeons. 3346 of these were implanted in Australia
C. The global full market release took place in March 2006 at the AAOS where it won the most innovative product awardExplanation
The correct answer is that the global full market release of the JBCS knee system took place in March 2006 at the AAOS where it won the most innovative product award. Additionally, over 65,000 JBCS knees have been implanted globally by over 600 surgeons, with 3346 of these being implanted in Australia. This information is provided in the statement itself and is therefore true.Rate this question:
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- 3.
The JBCS Knee System restored normal knee function by…
- A.
Increasing anterior-posterior stability throughout knee flexion
- B.
Promoting a normal kinematic pattern
- C.
Placing the femur more posteriorly during full extension to reduce paradoxical motion
- D.
A & B
Correct Answer
D. A & BExplanation
The JBCS Knee System is able to restore normal knee function by increasing anterior-posterior stability throughout knee flexion and promoting a normal kinematic pattern. By doing so, it helps to improve the overall movement and stability of the knee joint. The option "A & B" correctly represents these two aspects of the JBCS Knee System.Rate this question:
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- 4.
The JBCS knee system was designed to restore normal knee function by increasing A-P stability through a range of motion & promoting a normal kinematic pattern. This was made possible through which of the following novel design features?
- A.
Anatomically correct joint line and articulating surface
- B.
Anterior and internally rotated position of the femur in extension
- C.
Dual cam - ACL & PCL replication
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The JBCS knee system was designed to restore normal knee function by incorporating several novel design features. One of these features is an anatomically correct joint line and articulating surface, which helps to mimic the natural movement of the knee. Additionally, the knee system includes an anterior and internally rotated position of the femur in extension, which further enhances stability and function. Lastly, the system incorporates a dual cam design that replicates both the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL), providing additional stability and promoting a normal kinematic pattern. Therefore, all of the above design features contribute to the goal of restoring normal knee function.Rate this question:
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- 5.
Consistent with the articular surface of a normal knee, the JBCS design had a larger lateral than medial femoral condyle and higher lateral than medial tibial plateau resulting in an anatomically correct 3-degree joint line.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. The explanation states that the JBCS design had a larger lateral than medial femoral condyle and higher lateral than medial tibial plateau, resulting in an anatomically correct 3-degree joint line. However, the question does not provide any information about what the correct joint line should be. Therefore, it is not possible to determine if the given statement is true or false based on the information provided.Rate this question:
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- 6.
Which features of the JBCS tibial insert design mimic the native articular surfaces to provide medial stability and increased posterior translation of the lateral condyle during flexion?
- A.
The JBCS tibial insert was designed to be symmetrical in shape to mimic the native tibial plateau
- B.
As with the native tibial plateau the tibial insert was designed with a concave medial and convex lateral shape
- C.
As with the native tibial plateau the tibial insert was designed with a concave lateral and convex medial shape
- D.
A & C
Correct Answer
B. As with the native tibial plateau the tibial insert was designed with a concave medial and convex lateral shapeExplanation
The correct answer is that the JBCS tibial insert was designed with a concave medial and convex lateral shape, which mimics the native articular surfaces of the tibial plateau. This design feature provides medial stability and increased posterior translation of the lateral condyle during flexion, similar to the natural movement of the knee joint.Rate this question:
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- 7.
In the JBCS the posterior femoral condylar surfaces were extended with minimal bone resection through a ____ degree flexed cut, completely replacing the articular surfaces and restoring the original posterior offsets.
Correct Answer
15
15 degrees
fifteen
fifteen degreesExplanation
The correct answer is 15 degrees. In the JBCS, the posterior femoral condylar surfaces were extended with minimal bone resection through a 15-degree flexed cut. This procedure involved completely replacing the articular surfaces and restoring the original posterior offsets.Rate this question:
- 8.
In the JBCS the restoration of the posterior femoral condylar articular surfaces and offsets in combination with the lateral femoral rollback allowed for deep flexion up to…?
- A.
145 degrees
- B.
155 degrees
- C.
160 degrees
- D.
150 degrees
Correct Answer
B. 155 degreesExplanation
The JBCS (Joint Bi-Cruciate Stabilized) implant allows for the restoration of the posterior femoral condylar articular surfaces and offsets, as well as the lateral femoral rollback. This combination of features enables deep flexion of the knee joint. Among the given options, the highest degree of flexion mentioned is 155 degrees, making it the correct answer.Rate this question:
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- 9.
Studies have shown that conventional knee replacements routinely experience paradoxical motion – the anterior sliding of the femoral component on the tibia as the knee goes into flexion. How did the JBCS knee resist this paradoxical motion?
- A.
The cam post construct which replicated both anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) function
- B.
An inherent screw-home mechanism supporting a relative posterior and externally rotated position of the femur in extension
- C.
An inherent screw-home mechanism supporting a relative anterior and internally rotated position of the femur in extension
- D.
A & C
Correct Answer
D. A & CExplanation
The JBCS knee resisted paradoxical motion by using both the cam post construct, which replicated the function of the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL), and an inherent screw-home mechanism that supported a relative anterior and internally rotated position of the femur in extension. These features helped to stabilize the knee joint and prevent the anterior sliding of the femoral component on the tibia during flexion.Rate this question:
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- 10.
The normal screw home position of the JBCS allowed the knee to rest in its normal anatomical position and thus as in the normal knee the quadriceps muscle was not required to maintain stability in extension.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The normal screw home position of the JBCS refers to the natural alignment of the knee joint, where the tibia rotates externally to lock the knee in extension. In this position, the knee is stable without the need for the quadriceps muscle to actively maintain stability. Therefore, the statement is true.Rate this question:
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- 11.
As the JBCS knee moved out of screw home the external rotation of the femur resulted in…
- A.
Straightening of the quadriceps mechanism (increasing the Q angle) thereby increasing anterior femoral translation in deep flexion
- B.
Straightening of the quadriceps mechanism (reduction of the Q angle to 0) thereby increasing patella-femoral shear forces in deep flexion
- C.
Straightening of the quadriceps mechanism (reduction of Q angle to 0) thereby reducing patella-femoral shear forces in deep flexion
- D.
A & B
Correct Answer
C. Straightening of the quadriceps mechanism (reduction of Q angle to 0) thereby reducing patella-femoral shear forces in deep flexionExplanation
As the JBCS knee moved out of screw home, the external rotation of the femur would result in straightening of the quadriceps mechanism. This would reduce the Q angle to 0, which in turn would reduce patella-femoral shear forces in deep flexion. Therefore, the correct answer is "Straightening of the quadriceps mechanism (reduction of Q angle to 0) thereby reducing patella-femoral shear forces in deep flexion."Rate this question:
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- 12.
The JBCS Knee system featured an anterior and posterior cam. Which of the following statements are correct?
- A.
The anterior cam and post replicated the function of the ACL preventing posterior tibial translation (anterior femoral translation) and providing stability early in gait
- B.
The anterior cam and post replicated the function of the ACL preventing anterior tibial translation (posterior femoral translation) and providing stability early in gait
- C.
The posterior cam and post replicated the function of the PCL, providing posterior stability and limiting posterior translation of tibia (femoral anterior translation)
Correct Answer(s)
B. The anterior cam and post replicated the function of the ACL preventing anterior tibial translation (posterior femoral translation) and providing stability early in gait
C. The posterior cam and post replicated the function of the PCL, providing posterior stability and limiting posterior translation of tibia (femoral anterior translation)Explanation
The correct answer is that the anterior cam and post replicated the function of the ACL preventing anterior tibial translation (posterior femoral translation) and providing stability early in gait, while the posterior cam and post replicated the function of the PCL, providing posterior stability and limiting posterior translation of the tibia (femoral anterior translation). This means that the anterior cam and post are responsible for preventing the shin bone from moving forward in relation to the thigh bone, while the posterior cam and post are responsible for preventing the thigh bone from moving backward in relation to the shin bone. This arrangement provides stability and control during the early stages of walking.Rate this question:
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- 13.
According to published literature by Morra et al (2004) which knee system most closely replicated the kinematics of a healthy un-operated Knee?
- A.
PFC Rotating Platform
- B.
Vanguard PS
- C.
Triathlon CR
- D.
JBCS
- E.
ADVANCE Medial-Pivot Knee
Correct Answer
D. JBCS -
- 14.
In published literature by Cantani et al (2009) Knee joint kinematics were assessed in 16 JBCS patients using video-fluoroscopy and electromyography (EMG) during activities of daily-living including stair climbing, chair rising and sitting, and step up/down test. What did the results of this study show?
- A.
All JBCS patients demonstrated femoral external rotation and translation similar to that of other conventional knee designs
- B.
This more physiological knee motion resulted in recovery of normal extensor and flexor muscle function which was attributed to the more anatomical knee design
- C.
All patients demonstrated a combination of relatively normal locomotion and gait, coupled with clear femoral external rotation and translation
Correct Answer(s)
B. This more physiological knee motion resulted in recovery of normal extensor and flexor muscle function which was attributed to the more anatomical knee design
C. All patients demonstrated a combination of relatively normal locomotion and gait, coupled with clear femoral external rotation and translationExplanation
The results of the study showed that all patients with JBCS demonstrated a combination of relatively normal locomotion and gait. Additionally, they exhibited clear femoral external rotation and translation. This more physiological knee motion led to the recovery of normal extensor and flexor muscle function. The researchers attributed this recovery to the more anatomical knee design.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Nov 18, 2014Quiz Created by
SmithNephew1
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