Medacta - Model GMK- Sphere - Total Knee System - Brochure

Patient expectations are not as well fulfilled by TKA as by total hip replacement with fewer knee patients achieving a “forgotten joint” replacement.  Studies show that around 20% of TKA patients are not satisfied[^{1, 2, 3]}.  Excessive A/P motion may result in anterior knee pain and continued swelling. In many P/S designs, the stabilizing mechanism only engages after 70-80° of flexion leaving the knee vulnerable to A/P instability during the most commonly encountered functional activities.