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

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HSS Journal ®

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.

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Authors and Affiliations

  1. Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA

    Jessica Ehrhardt BA, Naomi Gadinsky BA, Stephen Lyman PhD, Daniel Markowicz MD & Geoffrey Westrich MD

Authors
  1. Jessica Ehrhardt BA
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  2. Naomi Gadinsky BA
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  3. Stephen Lyman PhD
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  4. Daniel Markowicz MD
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  5. Geoffrey Westrich MD
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Correspondence to Geoffrey Westrich MD.

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Each author certifies that he or she has no commercial associations (e.g., consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution has approved the reporting of this case, that all investigations were conducted in conformity with ethical principles of research.

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Ehrhardt, J., Gadinsky, N., Lyman, S. et al. Average 7-Year Survivorship and Clinical Results of a Newer Primary Posterior Stabilized Total Knee Arthroplasty. HSS Jrnl 7, 120–124 (2011). https://doi.org/10.1007/s11420-011-9196-1

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  • DOI: https://doi.org/10.1007/s11420-011-9196-1

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