J Knee Surg 2012; 25(03): 249-254
DOI: 10.1055/s-0031-1299660
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Functional Outcomes Used to Compare Single Radius and Multiradius of Curvature Designs in Total Knee Arthroplasty

Laurence E. Cook
1   School of Medicine, Case Western Reserve University, Cleveland, Ohio
,
Alison K. Klika
2   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Caleb R. Szubski
2   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
James Rosneck
2   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Robert Molloy
2   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Wael K. Barsoum
2   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
› Author Affiliations
Further Information

Publication History

27 April 2011

05 October 2011

Publication Date:
03 May 2012 (online)

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.