The effect of fixation type on the survivorship of contemporary total knee arthroplasty in patients younger than 65 years of age: a register-based study of 115,177 knees in the Nordic Arthroplasty Register Association (NARA) 2000–2016

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


Background and purpose — Cemented fixation is regarded as the gold standard in total knee arthroplasty (TKA). Among working-age patients, there has been controversy regarding the optimal fixation method in TKA. To address this issue, we conducted a register-based study to assess the survivorship of cemented, uncemented, hybrid, and inverse hybrid TKAs in patients aged < 65 years. Patients and methods — We used the Nordic Arthroplasty Register Association data of 115,177 unconstrained TKAs performed for patients aged < 65 years with primary knee osteoarthritis over 2000–2016. Kaplan–Meier (KM) survival analysis with 95% confidence intervals (CI) and Cox multiple-regression model with adjustment for age, sex, and nation were used to compare fixation methods in relation to revision for any reason. Results — The 10-year KM survivorship of cemented TKAs was 93.6% (95% CI 93.4–93.8), uncemented 91.2% (CI 90.1–92.2), hybrid 93.0% (Cl 92.2–93.8), and inverse hybrid 96.0% (CI 94.1–98.1). In the Cox model, hybrid TKA showed decreased risk of revision after 6 years’ follow-up compared with the reference group (cemented) (hazard ratio [HR] 0.5 [CI 0.4–0.8]), while uncemented TKAs showed increased risk of revision both < 1 year (HR 1.4 [1.1–1.7]) and > 6 years’ (HR 1.3 [1.0–1.7]) follow-up compared to the reference. Interpretation — Both cemented and hybrid TKAs had 10-year survival rates exceeding 92–>93% in patients aged < 65 years. Cemented TKA, however, was used in the vast majority (89%) of the operations in the current study. As it performs reliably in the hands of many, it still deserves the status of gold standard for TKA in working-age patients.


  • Mika J. Niemeläinen
  • Keijo T. Mäkelä
  • Otto Robertsson
  • Annette W-Dahl
  • Ove Furnes
  • Anne M. Fenstad
  • Alma B. Pedersen
  • Henrik M. Schrøder
  • Aleksi Reito
  • Antti Eskelinen
Enheter & grupper
Externa organisationer
  • University of Tampere
  • National Institute for Health and Welfare
  • Turku University Hospital
  • Skåne University Hospital
  • Haukeland University Hospital
  • University of Bergen
  • Aarhus University Hospital
  • Naestved Hospital

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Ortopedi
Sidor (från-till)184-190
Antal sidor7
TidskriftActa Orthopaedica
Utgåva nummer2
Tidigt onlinedatum2020
StatusPublished - 2020
Peer review utfördJa