Abstract
Background
There is limited knowledge regarding the relationship between the reason for revising a TKA and the clinical outcome in terms of satisfaction, pain, and function with time.
Questions/purposes
In a cohort of patients receiving a fully revised TKA, we hypothesized (1) outcomes would differ according to reason for revision at 2 years, (2) outcomes would improve gradually during those 2 years, (3) rates of complications differ depending on the reason for revision, and (4) patients with complications have lower scores.
Methods
We studied a prospective cohort of 150 patients receiving a fully revised TKA using a single implant system in two high-volume centers at 24 months of followup. VAS satisfaction, VAS pain, The Knee Society Scoring System© (KSS) clinical and functional scores, and complication rate were correlated with their reasons for revision, including septic loosening, aseptic loosening, component malposition, instability, and stiffness.
Results
The aseptic loosening group showed better outcomes compared with the instability, malposition, and septic loosening groups, which showed intermediate results (p < 0.05). The stiffness group performed significantly worse on all outcome measures. The outcome for patients with a complication, after treatment of the complication, was less favorable.
Conclusions
The reason for revision TKA predicts clinical outcomes. Satisfaction, pain reduction, and functional improvement are better and complication rates are lower after revision TKA for aseptic loosening than for other causes of failure. For component malposition, instability, and septic loosening groups, there may be more pain and a higher complication rate. For stiffness, the outcomes are less favorable in all scores.
Level of Evidence
Level III, prognostic study. See Guidelines for Authors for a complete description of levels of evidence.
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Acknowledgments
We thank the orthopaedic surgeons K. C. Defoort MD (Sint Maartenskliniek) and J. Bellemans MD (University Hospital Leuven) for performing surgeries on the patients included in this study and their helpful comments during manuscript preparation. We acknowledge P. G. Anderson for helpful editorial assistance.
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The institute of one or more of the authors (RWTMK, JJPS, GGH, ABW) has received, during the study period, funding from Smith & Nephew Inc (Memphis, TN, USA). One or more of the authors (GGH, HV, ABW) certifies that he or she, or a member of his or her immediate family, has received or may receive payments or benefits, during the study period, an amount of USD (GGH: USD 10,000–USD 100,000; HV: USD 10,000–USD 100,000; ABW: USD 10,000–USD 100,000), from Smith & Nephew.
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
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Each author certifies that his or her institution approved or waived approval for the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.
This work was performed at the Sint Maartenskliniek, Nijmegen, The Netherlands.
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van Kempen, R.W.T.M., Schimmel, J.J.P., van Hellemondt, G.G. et al. Reason for Revision TKA Predicts Clinical Outcome: Prospective Evaluation of 150 Consecutive Patients With 2-years Followup. Clin Orthop Relat Res 471, 2296–2302 (2013). https://doi.org/10.1007/s11999-013-2940-8
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DOI: https://doi.org/10.1007/s11999-013-2940-8