Product Overview
Designed to be a kinematically correct cruciate retaining TKA
The solution is PHYSIOLOGICAL MATCHINGâ—Š Technology through function, motion and durability
Function
Stability
Anatomic, articular surfaces are designed to restore native anatomy and yield a normal anatomic A/P position throughout the range of motion.
• Anterior stability is provided by a high posterior medial lip which mimics ACL function in full extension and early gait.
• Provides a proper femoro-tibial A/P position yielding a virtual elimination of paradoxical motion, anterior sliding of the femur during flexion.
Strength
• More normal muscle firing patterns are expected due to the proper A/P positioning, thereby helping to prevent muscle fatigue during activities of daily living.
• Restoration of both the anatomic A/P alignment and the normal kinematic patterns of the knee should produce more normal neuromuscular firing patterns throughout the range of motion—as demonstrated in the original JOURNEY BCS design.
Satisfaction (Proprioception)
Restoration of more normal neuromuscular firing patterns throughout the range of motion should improve a patient’s ability to perform the activities they are demanding—as demonstrated in the original JOURNEY BCS design.
Motion
Tibiofemoral (TF) kinematics
The kinematic patterns of the femur and tibia of a knee design have a direct impact on patients’reported levels of satisfaction with the outcomes of their knee replacements.
Extension
• Femur internally rotated to achieve a natural anatomic screw-home position
• Minimal posterior femoral overhang in the sagittal plane (Proper A/P position)
Mid-flexion
• Femur external rotation to maximize quadriceps mechanism efficiency
• Virtual elimination of paradoxical motion to prevent mid-flexion instability
Deep flexion
• Femur remains externally rotated to retain maximal quadriceps efficiency
• Significant posterior femoral rollback occurs to gain clearance for deep flexion in high demand activities
Patellofemoral (PF) kinematics
The kinematic pattern in the PF joint is critically important to decrease anterior knee pain post operatively and the associated revisions.22, 23, 24, 25
• Provides improved contact which should improve wear performance 22
• Provides improved patella tracking which should minimize anterior pain 22, 23
• Provides more freedom of baseplate positioning without maltracking concerns 26
Flexion
The normal kinematic patterns of movement provide the correct environment to allow an anatomic, deep flexion performance.
• Engineered to provide for up to 155° of flexion, following in the superior anatomic, high flexion kinematics proven in the first generation JOURNEY BCS. (http://www.smith-nephew.com/)
