Eight of ten patients return to daily activities, work, and sports after total knee arthroplasty

Table 1 Patient characteristics, surgical characteristics, and preoperative patient-reported outcomes, n (%)

Characteristics	Respondents, n = 2063	Nonrespondents, n = 367	P value
Patient characteristics
Age in year, median (IQR)	65.80 (7.19)	65.13 (8.39)	0.222
BMI in kg/m2, median (IQR)	27.77 (3.44)	27.84 (3.31)	0.516
Sex, male	973 (47.2)	190 (51.8)	0.112
ASA, I	799 (38.7)	143 (39.0)	0.954
Smoking status, yes	156 (7.6)	42 (11.4)	0.017a
Alcohol consumption, yes	1499 (72.7)	244 (66.5)	0.020a
Previous knee surgery, yes	986 (47.8)	173 (47.1)	0.821
Charnley classification			0.113
A Unilateral knee arthritis	972 (47.1)	160 (43.6)
B1 Unilateral knee TKA	482 (23.4)	78 (21.3)
B2 Bilateral TKA	412 (20.0)	94 (25.6)
C more joints affected	197 (9.5)	34 (9.3)
Surgical characteristics
Diagnosis, osteoarthritis	2021 (98.0)	355 (96.7)	0.175
Anesthesia technique, spinal	2043 (99.0)	362 (98.6)	0.763
Operative duration in min, median (IQR)	40.77 (9.51)	41.04 (9.83)	0.551
Complication, yes	62 (3.0)	18 (4.9)	0.078
Preoperative PROs
NRS pain score at rest, median (IQR)	4.92 (2.38)	5.23 (2.43)	0.021a
NRS pain score during activity, median (IQR)	7.18 (1.88)	7.18 (2.00)	0.558
KOOS-PS score, median (IQR)	47.23 (12.74)	48.98 (14.19)	0.084
EQVAS score, median (IQR)	72.91 (18.65)	72.96 (19.03)	0.906
EQ-5D descriptive system score, median (IQR)	0.590 (0.250)	0.551 (0.273)	0.013a
OKS, median (IQR)	24.92 (7.16)	23.83 (7.64)	0.042a

^aP < 0.05.

ASA: American Society of Anesthesiologists score; BMI: Body mass index; EQ-5D descriptive system: EuroQol five dimensions descriptive system; EQ VAS: EuroQol five dimensions Visual Analogue Scale; KOOS-PS: Knee Injury and Osteoarthritis Outcome Score - Physical Function Short Form; NRS: Numeric rating scale; OKS: Oxford knee score; PRO: Patient-reported outcomes; TKA: Total knee arthroplasty; IQR: Interquartile range.