HSS Journal

, Volume 7, Issue 2, pp 120–124

Average 7-Year Survivorship and Clinical Results of a Newer Primary Posterior Stabilized Total Knee Arthroplasty

  • Jessica Ehrhardt
  • Naomi Gadinsky
  • Stephen Lyman
  • Daniel Markowicz
  • Geoffrey Westrich
Original Article

DOI: 10.1007/s11420-011-9196-1

Cite this article as:
Ehrhardt, J., Gadinsky, N., Lyman, S. et al. HSS Jrnl (2011) 7: 120. doi:10.1007/s11420-011-9196-1

Abstract

We evaluated the average 7-year survivorship and clinical results of a newer primary posterior stabilized total knee arthroplasty (TKA). The modifications in this design included a deeper patellar sulcus aimed at reducing contact stresses, improving patellar tracking, and achieving greater maximum flexion. A consecutive group of 137 patients (171 knees) who underwent TKAs using the Optetrak PS knee prosthesis between October 1997 and March 2004 were followed for an average of 6.8 years (range 4.0–11.5 years). Preoperative range of motion (ROM) and Knee Society scores were obtained and compared to that of the patients’ most recent follow-up. Manipulation under anesthesia (MUA) and revision of the implant for any reason were considered endpoints for Kaplan–Meier survival analysis of all knees. Twenty-one knees (12.3%) underwent MUA. Three knees (1.8%) underwent revision, resulting in a 97.2% survival at a mean 10 years follow-up. Pain scores and ROM significantly improved after surgery (from preoperative average of 5.3 and 105° respectively to 44.6 and 120° postoperatively). These findings suggest that this posterior stabilized knee design is both a safe and effective option for patients undergoing primary TKA.

Keywords

total knee arthroplastysurvivorshipoutcomes

Copyright information

© Hospital for Special Surgery 2011

Authors and Affiliations

  • Jessica Ehrhardt
    • 1
  • Naomi Gadinsky
    • 1
  • Stephen Lyman
    • 1
  • Daniel Markowicz
    • 1
  • Geoffrey Westrich
    • 1
  1. 1.Hospital for Special SurgeryNew YorkUSA