JII BCS Exam: Knee System! Quiz

The correct answer is A & B. The key design changes that improved kinematics by reducing early rollback are the elevation of the posterior cam superiorly and the reduction in size of the cam. Additionally, shifting the post 2mm anteriorly also contributed to the improvement. These changes allow for a later engagement of the posterior cam and post in flexion, specifically around 60-70⁰.

The original JBCS insert has been modified by increasing the post height by an average of 2-3mm and squaring off the top of the post. This change has been made to address the complication of dislocation.

The correct answer is PHYSIOLOGICAL MATCHING. The explanation for this answer is that the ___MATCHING™ Technology of the JOURNEY II BCS Knee System uses virtual technology (LifeMOD) to simulate how the implant interacts with the knee's soft tissue envelope. This technology allows for a boost in function while providing improved reproducibility. The term "physiological matching" refers to the ability of the technology to replicate the natural function and movement of the knee, resulting in better outcomes for patients.

The original JBCS post being "rounded" at the top means that it had a curved shape at the upper part. This curvature made it more vulnerable to varus/valgus dislocation, which refers to the inward or outward angulation of the limb or joint. Therefore, the statement is true as the rounded shape increased the risk of dislocation.

The high-level rationale behind evolving the original JOURNEY BCS (JBCS) System was to complete the system, improve functionality, and increase repeatability. This means that the original system was not fully developed and needed further enhancements to make it more functional and reliable. By completing the system, improving its functionality, and increasing repeatability, the JBCS System would be able to meet the desired objectives and provide better outcomes.

The key changes to address IT band syndrome are a thinned anterior flange and reduced lateral condyle, as well as the post being shifted anteriorly and the posterior cam being elevated superiorly. These changes help to alleviate the complications associated with IT band syndrome.

The JII PS box has increased in size in order to accept a constrained insert (bail out option). This means that the box has been made larger to accommodate a specific type of insert, which allows for a constrained or limited range of movement. This could be necessary in certain situations where there is a need to restrict the movement of the joint for medical reasons or to provide additional support.

The correct statements are that the JOURNEY II BCS Knee full market release took place in March 2013 at the AAOS in the US, and more than 20,000 JOURNEY II BCS procedures have been completed. Additionally, in Australia, the first JOURNEY II BCS knee was implanted in August 2013.

The statement suggests that the stiffness of the original JBCS knee system was caused by excessive stresses on the soft tissues due to limited roll back of the femoral component. However, the correct answer is False, indicating that this statement is not true. Therefore, there must be another reason for the stiffness associated with the original JBCS knee system, which is not mentioned in the given information.