The Journal of Bone and Joint Surgery (American). 2006;88:2337-2342.
doi:10.2106/JBJS.F.00282
© 2006 The Journal of Bone and Joint Surgery, Inc.
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 Adult Knee Reconstruction Test 13: Winter 2007 (publication date February 1...
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Revision of a Failed Patellofemoral Arthroplasty to a Total Knee Arthroplasty

Jess H. Lonner, MD1, Jeff G. Jasko, MS1 and Robert E. Booth, Jr., MD1

1 Booth Bartolozzi Balderston Orthopaedics, Pennsylvania Hospital, 800 Spruce Street, Philadelphia, PA 19107. E-mail address for J.H. Lonner: lonnerj{at}pahosp.com

Investigation performed at Pennsylvania Hospital, Philadelphia, Pennsylvania

A video supplement to this article will be available from the Video Journal of Orthopaedics. A video clip will be available at the JBJS web site, www.jbjs.org. The Video Journal of Orthopaedics can be contacted at (805) 962-3410, web site: www.vjortho.com.

A commentary is available with the electronic versions of this article, on our web site (www.jbjs.org) and on our quarterly CD-ROM (call our subscription department, at 781-449-9780, to order the CD-ROM).

In support of their research for or preparation of this manuscript, one or more of the authors received grants or outside funding from Zimmer, Inc. In addition, one or more of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity (Zimmer, Inc.). Also, a commercial entity (Zimmer, Inc.) paid or directed, or agreed to pay or direct, benefits to a research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Background: Patellofemoral arthroplasty is an effective treatment for isolated arthritis of the anterior compartment of the knee, but it is unclear whether it compromises the results of total knee arthroplasty if revision is necessary. The purpose of this study was to review the results of total knee arthroplasty after a prior patellofemoral arthroplasty.

Methods: Twelve failed patellofemoral replacements in ten patients were revised to total knee arthroplasties for isolated progressive tibiofemoral arthritis (six knees), isolated patellofemoral catching and maltracking (three), or a combination of both (three). Revisions were performed at a mean of four years after the patellofemoral arthroplasty. A posterior stabilized implant was used in each knee, without a need for stems, augments, or structural bone graft. Patients were assessed by clinical and radiographic follow-up, including Knee Society clinical and functional scores. Baseline preoperative Knee Society scores were obtained at the time of evaluation of the failed patellofemoral arthroplasty.

Results: At a mean follow-up of 3.1 years, the mean Knee Society clinical and functional scores had increased from 57 points preoperatively to 96 points and from 51 points preoperatively to 91 points, respectively. At the most recent follow-up, there was no clinical or radiographic evidence of patellofemoral maltracking, loosening, or wear.

Conclusions: On the basis of our experience in this relatively small series with short-term follow-up, the results of total knee arthroplasty do not seem to be compromised after revision of the failed patellofemoral replacement.

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


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