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Scientific Articles   |    
Ten-Year Follow-up of a Rotating-Platform, Posterior-Stabilized Total Knee Arthroplasty
Morteza Meftah, MD1; Amar S. Ranawat, MD1; Chitranjan S. Ranawat, MD1
1 Weill Medical College of Cornell University, Hospital for Special Surgery, 535 E. 70th Street, New York, NY 10021. E-mail address for M. Meftah: MeftahM@HSS.edu
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  • Disclosure statement for author(s): PDF

Investigation performed at the Hospital for Special Surgery, New York, NY



Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by the authors of this work are available with the online version of this article at jbjs.org.

Copyright © 2012 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2012 Mar 07;94(5):426-432. doi: 10.2106/JBJS.K.00152
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Abstract

Background: 

The rotating-platform, posterior-stabilized knee was designed to decrease polyethylene wear and to address challenges associated with Low Contact Stress mobile-bearing knees. The purpose of the present prospective study was to investigate the long-term clinical and radiographic results and the survival rate for this implant.

Methods: 

From January 2000 to October 2001, 117 consecutive patients (138 knees) underwent rotating-platform posterior-stabilized total knee arthroplasty with cement. All patients were followed prospectively. At a mean of 10 ± 0.4 years (range, 9.5 to eleven years) of follow-up, twenty patients had died and eight had been lost to follow-up, leaving eighty-nine patients (106 knees) for analysis.

Results: 

A good to excellent result according to the Knee Society pain score, which improved from an average of 44 to 94 points, was achieved in 96% (eighty-five) of the eighty-nine patients in the final cohort. The mean knee motion improved from 111° to 119°. The prevalence of postoperative pain was 14%. The prevalence of asymptomatic crepitation was 9.4%, and the prevalence of painful crepitation requiring scar excision was 3.8%. Radiographic analysis revealed no malalignment, aseptic loosening, or osteolysis. There were three revisions: one for the treatment of infection and two for the treatment of traumatic supracondylar fractures. Kaplan-Meier analysis revealed that the ten-year survival rate was 100% with revision due to mechanical failure as the end point, 97.7% with revision for any reason as the end point, and 95% with any reoperation as the end point.

Conclusions: 

The ten-year follow-up of the rotating-platform, posterior-stabilized total knee arthroplasty demonstrated excellent clinical results and survival rates with no failures due to osteolysis or loosening.

Level of Evidence: 

Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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