Table 5.

Absolute PROMs at each timepoint with improvements in OKS for individuals

PROM	Timepoint	Median	Mean (95% CI)	p value
PCS	Preop	29.0	30.5 (29.3 to 31.8)	< 0.001^
	0.5 year	42.1	41.5 (39.8 to 43.1)
	1 year	43.4	43.4 (41.5 to 45.2)
	5 years	39.3	41.7 (39.7 to 43.8)
	10 years	39.6	39.2 (37.2 to 41.2)
MCS	Preop	53.6	51.3 (49.4 to 53.2)	0.014^
	0.5 year	55.4	52.3 (50.6 to 54.0)
	1 year	55.9	52.6 (50.9 to 54.4)
	5 years	54.4	51.7 (49.9 to 53.5)
	10 years	50.9	48.6 (46.7 to 50.5)
OKS	Preop	18	18.8 (17.6 to 19.9)	< 0.001^
	0.5 year	37	34.3 (32.6 to 36.1)
	1 year	39	36.3 (34.6 to 38.0)
	5 years	41	37.3 (35.5 to 39.0)
	10 years	38	34.7 (32.9 to 36.5)
OKS improvement	Preop to 1 year	18	17.7 (16.1 to 19.2)	< 0.001*
	1–5 years	1	1.2 (− 0.1 to 2.4)	n.s.*
	5–10 years	− 1.5	− 3.0 (− 4.3 to − 1.7)	< 0.001*

p values (^{^}two-way ANOVA, *paired t tests) reflect changes over time between values