Total Knee Arthroplasty Designed to Accommodate the Presence or Absence of the Posterior Cruciate Ligament

Figure 2

The 3D Knee fixed-bearing TKA design incorporates a hemispherical lateral condyle and tibial articulation to provide definitive AP translational control while providing for proper axial rotation. The asymmetric femoral component incorporates a constant sagittal radius from −15° to 80° while providing progressively decreasing articular constraint with higher flexion to allow femoral condyle rollback. The posterior condyles are shaped to provide maximum posterior condylar offset late in the flexion arc.