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J Knee Surg 2017; 30(05): 484-492
DOI: 10.1055/s-0036-1593361
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Varus–Valgus Constrained Knee Implant: Survivorship and Outcomes

Marcelo B. P. Siqueira
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Paul Jacob
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
John McLaughlin
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Alison K. Klika
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Robert Molloy
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Carlos A. Higuera
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Wael K. Barsoum
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
› Author Affiliations
Further Information

Publication History

13 May 2016

07 August 2016

Publication Date:
28 September 2016 (online)

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Abstract

The purpose of this study was to estimate the survivorship of the varus–valgus constrained (VVC) knee implants in primary, aseptic, and septic revision total knee arthroplasty (TKA); determine functional outcomes; main modes of failure; and variables associated with increased mechanical failures. In this study, 685 consecutive cases of primary (n = 247), aseptic (n = 315), and septic revision (n = 123) TKAs with VVC implants were performed between 1999 and 2008; 533 knees (78%) had a mean follow-up of 8.2 years (range, 2–15.1). Kaplan–Meier method was used to evaluate implant survival with mechanical failure as the end point. Clinical outcomes were measured with a modified Knee Society Score (mKSS) and modified Knee Function Score (mKFS) and modes of failure were determined. Cox proportional hazards models were performed to assess for factors associated with implant failure. Ten-year survival was 88.5% (95% confidence interval [CI]: 83.9–93.5%) for primary TKAs, 75.8% (95% CI: 70.4–81.7%) for aseptic, and 54.6% (95% CI: 43.7–68.2%) for septic revisions. Improvement in pre- to postoperative mKSS and mKFS were significant in all three groups (p < 0.05). The most common mode of failure overall was infection. Mechanical modes of failures included periprosthetic fracture (45%) for primary TKA and soft tissue instability (19%) for aseptic revisions. A longer period since the last surgery in affected knee was associated with lower mechanical failures (hazards ratio of 0.55 [95% CI: 0.31–0.95], p = 0.03). VVC implant showed reliable survivorship at 10 years although careful patient selection is warranted due to the risk of infection. The main mechanical modes of failure were instability and periprosthetic fracture.

Keywords

total knee arthroplasty - revision total knee arthroplasty - periprosthetic fracture
 

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