Evaluating two implant designs in patients undergoing primary total knee arthroplasty using a novel measure of early optimal recovery: a retrospective observational study.

Other analyses Following the primary analysis, several subgroup analyses were also conducted: (1) only including years 2019–2020, as these years included both implants while in 2017–2018 only the control device was used, and because a decreasing trend in LOS was observed throughout, (2) excluding saphenous block + LIA as this was mostly used in 2020, mainly by surgeon 3 and mostly alongside the study device, (3) excluding surgeon 3 who operated mostly with the study device, (4) only including year 2019 with the same justification as (1) and because in 2019 there was an equal distribution of procedures between the control and study devices, and (5) excluding surgeons 2 and 3, and saphenous block + LIA with the same justification as (2) and (3), and because surgeon 1 did not use saphenous block + LIA except in one case.

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