Introduction
Patients and Methods
Multi-center Study
Work Osteoarthritis or Joint-Replacement Questionnaire (WORQ) and Expectations
Statistical Analysis
Results
Working TKA Patients—Characteristics
Variable | Mean (SD), median [IQR] or cases (percentage) n = 236 | Knee-demanding job n = 118 | No knee-demanding job n = 118 | |
---|---|---|---|---|
Age | Years | 59 [54–62] | 58 [53–61]a | 60 [56–62]a |
Sex | Male | 104 (44%) | 45 (38%) | 59 (50%) |
Female | 132 (56%) | 73 (62%) | 59 (50%) | |
Educational level | Lower vocational/general | 51 (21%) | 31 (26%) | 20 (17%) |
Intermediate vocational/intermediate and higher general | 128 (55%) | 60 (51%) | 68 (58%) | |
Higher vocational/university | 56 (24%) | 26 (22%) | 30 (25%) | |
BMI | Body mass/body height2 (kg/m2) | 29 [26–33] | 29 [26–32] | 29 [26–33] |
Comorbidity | No other impairing disease | 187 (80%) | 93 (79%) | 94 (80%) |
One other impairing disease | 34 (14%) | 15 (13%) | 19 (16%) | |
More than one other impairing disease | 14 (6%) | 9 (8%) | 5 (4%) | |
KOOS symptoms | 0–100 | 43 [32–57] | 43 [32–54] | 43 [36–61] |
KOOS pain | 0-100 | 38 (17) | 36 [21–47]a | 42 [28–53]a |
KOOS Quality of Life | 0–100 | 25 [13–38] | 19 [13–34] | 25 [13–38] |
Time before operation | < 4 weeks | 134 (57%) | 69 (59%) | 65 (55%) |
4–8 weeks | 33 (14%) | 15 (13%) | 18 (15%) | |
8–12 weeks | 19 (8%) | 11 (9%) | 8 (7%) | |
> 12 weeks | 24 (10%) | 13 (11%) | 11 (9%) | |
Date of operation unknown | 26 (11%) | 10 (9%) | 16 (14%) | |
Desire to return to current job | Yes | 224 (95%) | 112 (95%) | 112 (95%) |
No | 12 (5%) | 6 (5%) | 6 (5%) |
WORQ
Variable | Working TKA patients n = 236 Median [IQR] or cases (percentage) | Knee-demanding joba n = 118 Median [IQR] or cases (percentage) | No knee-demanding job n = 118 Median [IQR] or cases (percentage) | Difference between the groups of knee-demanding and no knee-demanding job |
---|---|---|---|---|
WORQ score | 44 [IQR 35–56] | 42 [IQR 33–54] | 44 [IQR 37–56] | n.s. |
Expected WORQ score | 75 [IQR 60–85] | 75 [IQR 59–85] | 77 [IQR 60–87] | n.s. |
Expected difference (WORQ-Expected WORQ) | 29 [IQR 10–44] | 29 [IQR 10–43] | 33 [IQR 11–44] | n.s. |
Expected WORQ score ≤ 50 (unsatisfied) | 41 (17%) | 23 (20%) | 18 (15%) | n.s. |
WORQ score ≥ 71 (satisfied) | 143 (61%) | 71 (60%) | 72 (61%) | n.s. |
MID (> 13 point) | 171 (73%) | 86 (73%) | 85 (72%) | n.s. |