Abstract
A recent development to better recreate joint kinematics has been a change from a
multiradius (MR) design to a single radius (SR) design. We analyzed 559 primary total
knee arthroplasty (TKA) procedures which used either a SR (n = 426 Triathlon®; Stryker Orthopaedics, Mahwah, NJ) or MR of curvature knee system (n = 133 Duracon®; Stryker Orthopaedics, Mahwah, NJ) (79.3% follow-up; 705 total TKA procedures identified).
Patients were administered a modification of the Knee Society score (KSS) (3.9 years
average follow-up). The SR design showed improvements over the MR design in pain (p = 0.021), stability (p = 0.002), flexion (p = 0.006), ability to completely straighten the knee (p = 0.025), stair climbing (p = 0.0001), walking (p = 0.0001), use of assistive devices (p = 0.0005), postoperative knee score (p = 0.0005), and postoperative function (p < 0.0001). Analysis of the change in KSS knee (p = 0.002) and function scores (p = 0.002) from preoperative visit to postoperative follow-up favored the SR design
as well. These data support the use of SR implants and provide evidence of improved
outcomes in terms of function, stability, and pain.
Keywords
total knee arthroplasty - single radius - multiradius - implant design - function
