Mean scores

NRS (rest)
NRS (activity)
EQ5D index score
EQ5D thermometer
KOOS-PS score
Oxford Knee score
NRS (satisfaction)
Anchor question

Knee » PROMs » Mean scores » NRS (rest)

FIGURE Mean pre-operative, 6 months and 12 months postoperative NRS (rest) scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean NRS (rest) scores

NRS (rest) score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,485	5.44 (5.34-5.54)	2,480	3.36 (3.25-3.46)	2,517	3.52 (3.41-3.63)
Moderately satisfied: 5-7	7,580	5.49 (5.44-5.54)	7,675	2.99 (2.94-3.04)	7,743	2.91 (2.85-2.96)
Very satisfied: 8-10	24,709	5.05 (5.02-5.09)	24,999	1.32 (1.29-1.34)	25,284	0.87 (0.85-0.89)
Total	37,846	5.19 (5.16-5.21)	38,313	1.84 (1.82-1.86)	38,350	1.51 (1.49-1.53)

The NRS (satisfaction) score measures patients’ satisfaction with the outcome of after joint replacement. The score has a range of 0.0 to 10.0, with 0.0 representing very unsatisfied and 10.0 representing very satisfied.
TKA: total knee arthroplasty; CI: confidence interval.

The NRS (rest) score measures pain during rest. The score has a range of 0.0 to 10.0, with 0.0 representing no pain and 10.0 representing the most possible pain.

Knee » PROMs » Mean scores » NRS (activity)

FIGURE Mean pre-operative, 6 months and 12 months postoperative NRS (activity) scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean NRS (activity) scores

NRS (activity) score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,483	7.49 (7.42-7.57)	2,477	4.71 (4.60-4.82)	2,520	4.94 (4.81-5.06)
Moderately satisfied: 5-7	7,576	7.46 (7.42-7.50)	7,679	4.39 (4.34-4.44)	7,745	4.33 (4.28-4.38)
Very satisfied: 8-10	24,700	7.28 (7.26-7.31)	25,004	2.16 (2.13-2.18)	25,305	1.50 (1.47-1.52)
Total	37,828	7.32 (7.30-7.34)	38,323	2.83 (2.80-2.85)	38,371	2.35 (2.33-2.38)

The NRS (activity) score measures pain during activity. The score has a range of 0.0 to 10.0, with 0.0 representing no pain and 10.0 representing the most possible pain.

Knee » PROMs » Mean scores » EQ5D index score

FIGURE Mean pre-operative, 6 months and 12 months postoperative EQ-5D index scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean EQ-5D index scores

EQ-5D Index score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,509	0.54 (0.53-0.55)	2,463	0.64 (0.63-0.65)	2,485	0.61 (0.60-0.62)
Moderately satisfied: 5-7	7,705	0.54 (0.54-0.55)	7,664	0.69 (0.68-0.69)	7,706	0.69 (0.69-0.70)
Very satisfied: 8-10	25,286	0.58 (0.58-0.58)	25,111	0.83 (0.83-0.83)	25,228	0.86 (0.86-0.86)
Total	39,015	0.57 (0.57-0.57)	38,793	0.78 (0.78-0.79)	38,493	0.81 (0.80-0.81)

The EQ-5D index score measures quality of life. The score has a range of -0.329 to 1.0, with 1.0 representing the best possible quality of life.

Knee » PROMs » Mean scores » EQ5D thermometer

FIGURE Mean pre-operative, 6 months and 12 months postoperative EQ-5D thermometer scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean EQ-5D thermometer scores

EQ-5D thermometer score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,517	65.5 (64.7-66.3)	2,484	65.7 (64.9-66.6)	2,491	63.1 (62.2-63.9)
Moderately satisfied: 5-7	7,716	65.7 (65.2-66.1)	7,710	68.8 (68.4-69.2)	7,742	68.2 (67.8-68.6)
Very satisfied: 8-10	25,296	70.8 (70.5-71.0)	25,272	78.6 (78.4-78.9)	25,324	80.0 (79.8-80.3)
Total	39,102	69.0 (68.8-69.2)	39,031	75.5 (75.3-75.6)	38,698	76.0 (75.8-76.2)

The EQ-5D thermometer score measures the health situation. The score has a range of 0.0 to 100.0, with 0.0 representing the worst possible health situation and 100.0 the best possible health situation.

Knee » PROMs » Mean scores » KOOS-PS score

FIGURE Mean pre-operative, 6 months and 12 months postoperative KOOS-PS scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean KOOS-PS scores

KOOS-PS score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,469	52.7 (52.1-53.3)	2,413	40.7 (40.1-41.4)	2,440	42.5 (41.7-43.2)
Moderately satisfied: 5-7	7,597	52.4 (52.1-52.7)	7,403	38.0 (37.8-38.3)	7,477	37.7 (37.5-38.0)
Very satisfied: 8-10	24,936	49.9 (49.7-50.0)	24,435	26.5 (26.4-26.7)	24,584	23.0 (22.9-23.2)
Total	38,451	50.6 (50.5-50.8)	37,735	30.2 (30.0-30.3)	37,548	27.7 (27.6-27.9)

The KOOS-PS score measures the physical functioning of patients with osteoarthritis to the knee. The score has a range of 0.0 to 100.0, with 0.0 representing no effort and 100.0 the most possible effort.

Knee » PROMs » Mean scores » Oxford Knee score

FIGURE Mean pre-operative, 6 months and 12 months postoperative Oxford Knee scores of patients who underwent a TKA for osteoarthritis by NRS satisfaction score in the Netherlands in 2014-2022

TABLE Mean Oxford Knee scores

Oxford Knee score	Pre-operative		6 months postoperative		12 months postoperative
NRS satisfaction	n	Mean (95% CI)	n	Mean (95% CI)	n	Mean (95% CI)
Not satisfied: 0-4	2,408	22.4 (22.1-22.7)	2,378	29.3 (28.9-29.7)	2,394	29.3 (28.9-29.8)
Moderately satisfied: 5-7	7,347	22.8 (22.6-22.9)	7,323	32.4 (32.3-32.6)	7,378	33.1 (33.0-33.3)
Very satisfied: 8-10	24,016	24.1 (24.0-24.2)	23,974	39.9 (39.8-40.0)	24,104	41.9 (41.9-42.0)
Total	36,895	23.7 (23.6-23.8)	36,728	37.5 (37.4-37.6)	36,348	39.1 (39.1-39.2)

The Oxford Knee score measures the physical functioning and pain of patients with osteoarthritis to the knee. The score has a range of 0.0 to 48.0, with 0.0 representing no functional ability and 48.0 the most functional ability.

Knee » PROMs » Mean scores » NRS (satisfaction)

FIGURE Mean 6 months and 12 months postoperative NRS (satisfaction) scores of patients who underwent a TKA for osteoarthritis in the Netherlands in 2014-2022

TABLE Mean NRS (statisfaction) scores

	6 months postoperative		12 months postoperative
	n	Mean (95% CI)	n	Mean (95% CI)
NRS satisfaction	35,796	7.87 (7.84-7.89)	35,936	7.98 (7.95-8.01)

TKA: total knee arthroplasty; CI: confidence interval.

The NRS (satisfaction) score measures patients’ satisfaction with the outcome of after joint replacement.
The score has a range of 0.0 to 10.0, with 0.0 representing very unsatisfied and 10.0 representing very satisfied.

Knee » PROMs » Mean scores » Anchor question

FIGURE Mean 6 months and 12 months postoperative change in daily functioning and pain of patients who underwent a TKA for osteoarthritis in the Netherlands in 2014-2022

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TABLE Mean anchor questions

	6 months postoperative		12 months postoperative
Anchor question score	n	Mean (95% CI)	n	Mean (95% CI)
Daily functioning	37,712	5.52 (5.51-5.53)	37,742	5.69 (5.67-5.70)
Pain	35,759	5.87 (5.86-5.88)	35,781	6.00 (5.99-6.01)

TKA: total knee arthroplasty; CI: confidence interval.

The anchor questions daily functioning and pain measure change in daily functioning and change in pain degree after joint replacement.
The score has a range of 1.0 to 7.0, with 1.0 representing very deteriorated and 7.0 representing very improved.

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