Results of unicompartmental knee arthroplasty at a minimum of ten years of follow-up

Richard A. Berger, R. Michael Meneghini, Joshua J. Jacobs, Mitchell B. Sheinkop, Craig J. Della Valle, Aaron G. Rosenberg, Jorge O. Galante

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Abstract

Background: There is a renewed interest in unicompartmental knee arthroplasty. The present report describes the minimum ten-year results associated with a unicompartmental knee arthroplasty design that is in current use. Methods: Sixty-two consecutive unicompartmental knee arthroplasties that were performed with cemented modular Miller-Galante implants in fifty-one patients were studied prospectively both clinically and radiographically. All patients had isolated unicompartmental disease without patellofemoral symptoms. No patient was lost to follow-up. Thirteen patients (thirteen knees) died after less than ten years of follow-up, leaving thirty-eight patients (forty-nine knees) with a minimum of ten years of follow-up. The average duration of follow-up was twelve years. Results: The mean Hospital for Special Surgery knee score improved from 55 points preoperatively to 92 points at the time of the final follow-up. Thirty-nine knees (80%) had an excellent result, six (12%) had a good result, and four (8%) had a fair result. At the time of the final follow-up, thirty-nine knees (80%) had flexion to at least 120°. Two patients (two knees) with well-fixed components underwent revision to total knee arthroplasty, at seven and eleven years, because of progression of patellofemoral arthritis. At the time of the final follow-up, no component was loose radiographically and there was no evidence of periprosthetic osteolysis. Radiographic evidence of progressive loss of joint space was observed in the opposite compartment of nine knees (18%) and in the patellofemoral space of seven knees (14%). Kaplan-Meier analysis revealed a survival rate of 98.0% ± 2.0% at ten years and of 95.7% ± 4.3% at thirteen years, with revision or radiographic loosening as the end point. The survival rate was 100% at thirteen years with aseptic loosening as the end point. Conclusions: After a minimum duration of follow-up of ten years, this cemented modular unicompartmental knee design was associated with excellent clinical and radiographic results. Although the ten-year survival rate was excellent, radiographic signs of progression of osteoarthritis in the other compartments continued at a slow rate. With appropriate indications and technique, this unicompartmental knee design can yield excellent results into the beginning of the second decade of use. Level of Evidence: Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.

Original languageEnglish (US)
Pages (from-to)999-1006
Number of pages8
JournalJournal of Bone and Joint Surgery - Series A
Volume87
Issue number5
DOIs
StatePublished - May 1 2005

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ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Berger, R. A., Meneghini, R. M., Jacobs, J. J., Sheinkop, M. B., Della Valle, C. J., Rosenberg, A. G., & Galante, J. O. (2005). Results of unicompartmental knee arthroplasty at a minimum of ten years of follow-up. Journal of Bone and Joint Surgery - Series A, 87(5), 999-1006. https://doi.org/10.2106/JBJS.C.00568