Table 1.

Inclusion criteria.

Criteria	Definition/justification
Unilateral, primary total knee replacement	We included studies in which participants underwent total knee replacement. We excluded studies in which participants underwent unicompartmental knee replacement as satisfaction levels may differ significantly between patients with unicompartmental and total knee replacement [17]. We included studies where <5% of participants underwent simultaneous bilateral TKR*. This is because satisfaction levels may be significantly different among people who receive a unilateral versus simultaneous bilateral TKR [18]. Studies involving participants undergoing their second primary TKR were included. Where it was unclear whether the bilateral TKRs were simultaneous or staged, it was assumed that they were simultaneous. We included studies where <5% of participants underwent revision TKR. This is because satisfaction levels may be significantly different among people who receive a primary versus revision TKR [19]. The 5% cut-off enabled us to include relevant studies where 95% of participants met our criteria. We anticipated that a 5% threshold would not significantly impact satisfaction outcomes reported in this review.
Total knee replacement for osteoarthritis of the knee	We included studies where <5% of participants underwent TKR for pathologies other than osteoarthritis. This is because the concerns and priorities of patients undergoing TKR differ according to their underlying diagnosis and the satisfaction levels may be significantly different between people undergoing TKR for osteoarthritis versus other pathology [20]. Accordingly, we excluded studies that did not explicitly state the reason for performing TKR.
Satisfaction measured ≥6 months post-operatively	We included studies that assessed satisfaction ≥6 months post TKR in order to capture satisfaction with outcome rather than process of care, and in light of evidence that 6 months would be a sufficient minimum time-frame in which to assess satisfaction given the majority of improvement in function after TKR takes place in the first 6 months post-surgery [21].
Satisfaction with total knee replacement outcome	We excluded studies that assessed satisfaction with the process of care, as this is a different construct to satisfaction with treatment outcome. We also excluded studies that did not include a measure of satisfaction with treatment outcome, but instead, inferred patient satisfaction from changes in knee pain or function following TKR [22].
Quantitative studies	We excluded any qualitative studies as our aim was to quantify satisfaction with TKR.
Original, full text articles	We excluded review papers and conference abstracts.
Articles written in English	Given the large scope of this review, for pragmatic reasons we excluded studies that were not written in English