Sagittal radius of curvature, trochlea design and ultracongruent insert in total knee arthroplasty

Abstract

□ Multi radius (MR) total knee arthroplasty (TKA) has been associated with mid-flexion instability. □ Single radius (SR) TKA may provide better anteroposterior stability through single flexion axis and biomechanical advantage for quadriceps function. □ Medial pivot (MP) TKA and gradually reducing (GR) radius TKA produce better knee kinematics. □ Clinical outcomes are equivalent for SR, MR and MP TKA. □ Short-term studies have shown better clinical outcomes and kinematics for GR TKA. □ Thinner and narrow anterior flange, deeper trochlea groove and more anatomical trochlea design reduces patellofemoral complications in TKA □ Ultracongruent inserts provide comparable clinical outcomes to posterior-stabilized TKA and cruciate retaining TKA.