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Beitragstitel No difference in patient-reported satisfaction after 12 months between customised individually made and off-the-shelf total knee arthroplasty
Beitragscode P31
  1. Séverin Wendelspiess LEONARDO - Ärzte für Orthopädie und Traumatologie Vortragender
  2. Raphael Kälin LEONARDO - Ärzte für Orthopädie und Traumatologie
  3. Nicole Vogel LEONARDO - Ärzte für Orthopädie und Traumatologie
  4. Thomas Rychen LEONARDO - Ärzte für Orthopädie und Traumatologie
  5. Markus P. Arnold Praxis MEIN KNIE, Hirslanden Klinik Birshof
Präsentationsform Poster
  • A05 - Knie
Abstract Purpose
A subset of patients is usually not satisfied after a total knee arthroplasty (TKA). Customised individually made (CIM) TKA are deemed to overcome drawbacks of classical off-the-shelf (OTS) TKA, but evidence is still sparse. To get a better understanding of the patients’ perspective, their satisfaction after TKA and potential problems in daily life, an evaluation of patient-reported outcome measures (PROM) is necessary. The aim of this study was to compare satisfaction of patients with CIM and OTS TKA.

We analysed clinical and patient-reported outcome measures (PROM) between patients with CIM and OTS TKA between January 2017 and September 2020.
The primary outcome was patient satisfaction after 12 months. Secondary outcomes were the Knee Society Score (KSS), the Knee injury and Osteoarthritis Outcome Score (KOOS), the Forgotten Joint Score (FJS-12) and the EQ-5D-3L after 4 and 12 months. Differences between pre- and postoperative data were analysed with paired t-tests for continuous variables and Wilcoxon signed rank test for categorical variables. To support the interpretation of PROM results, we have calculated the proportion of patients whose PROMs improved at least by the minimal important difference (MID).

Data was analysed from 74 CIM TKA and 169 OTS TKA. Patients with CIM TKA were slightly younger (CIM 67.1 years, OTS 69.7 years, p = 0.019), more often male (CIM 55%, OTS 40%, p = 0.035), had a lower body mass index (CIM 26.6 kg/m2, OTS 28.7 kg/m2, p < 0.001), a lower KSS (CIM 52.8, OTS 57.1, p = 0.018) and partially higher preoperative PROMs.
Patient satisfaction after 12 months was high and comparable (CIM 87%, OTS 89%). All PROMs improved for both groups (p < 0.001) and did not differ after 12 months (p > 0.063). The majority of patients improved above the MID (range 65% to 89%) and reported a clear overall improvement (CIM 86%, OTS 87%). The postoperative KSS, notably regarding knee stability, was higher for CIM TKA (p < 0.001).

No difference was found in patient satisfaction between CIM and OTS TKA after 12 months. In both groups, patient satisfaction was high and PROMs improved considerably.

(Comment: This abstract was written as part of a paper published before the congress. If it does not result in a Free Averaging, we could imagine writing a poster if that is in your interest.)