Preoperative characteristics of knee OA participants
| Participant characteristic | n=1053 |
| Key contextual factors | |
| Age (years), mean (SD) | 66.9 (8.8) |
| Sex=female, n (%) | 617 (58.6) |
| Employed for pay, n (%) | 344/1040 (33.1) |
| Education=post-secondary, n (%) | 584/1036 (56.4) |
| Lubben Social Network Score, mean (SD) | 18.0 (5.5) |
| Previous hip/knee replacement, n (%) | 164 (15.9) |
| Measures of TKA appropriateness | |
| TKA need | |
| WOMAC Pain Score (0–100), mean (SD) (higher scores worse) | 57.2 (17.3) |
| KOOS-PS (0–100), mean (SD) (higher scores worse) | 52.8 (17.1) |
| Arthritis coping efficacy (4–20), mean (SD) (higher scores better) | 13.4 (3.8) |
| Received OA treatment previously, n (%) | 731/1029 (71.0) |
| Readiness and willingness to undergo TKA | |
| PHQ-8 (0–24), median (IQR) | 5.0 (2–10) |
| PHQ-8 Score≥10/24, n (%) (moderate–severe depressive symptoms) | 271 (25.8) |
| Definitely willing, n (%) | 905/1031 (87.8) |
| PASS=unacceptable, n (%) | 836/1049 (79.7) |
| Health status | |
| BMI, mean (SD) | 32.5 (6.3) |
| Number of comorbid conditions, n (%) | |
| 0 | 272/1034 (26.3) |
| 1 | 363 (35.1) |
| 2 | 244 (23.6) |
| 3+ | 155 (15.0) |
| Current smoker, n (%) | 74/1041 (7.1) |
| Troublesome hip(s), n (%) | 239/1034 (23.1) |
| Troublesome contralateral knee, n (%) | 523/1034 (50.6) |
| Low back pain, n (%) | 267/1053 (25.4) |
| TKA expectations, n (%) indicating a ‘very important’ TKA outcome | |
| Perform daily activities | 867/1052 (82.4) |
| Go upstairs | 899/1051 (85.5) |
| Walk | 1011/1046 (96.7) |
| Relieve pain | 983/1051 (93.5) |
| Squat | 604/1051 (57.5) |
| Kneel | 651/1050 (62.0) |
| Change position, for example, get up from chair | 831/1047 (79.4) |
| Straighten knee/leg | 622/1048 (59.5) |
| Exercise or participate in sports | 687/1048 (65.6) |
| Engage in sexual activity | 391/1040 (37.6) |
| Participate in recreational activities | 793/1050 (75.5) |
| Work for pay | 317/1042 (30.4) |
| Interact with others, for example, care giving | 704/1051 (67.0) |
| Walk without aids | 699/1045 (66.9) |
| Take public transit or drive | 657/1051 (62.5) |
| Enjoy well-being | 697/1046 (66.6) |
Denominator is shown when response is <100%.
BMI, body mass index; KOOS-PS, Knee injury and Osteoarthritis Outcome Score physical function short-form; OA, osteoarthritis; PASS, Patient Acceptable Symptom State; PHQ-8, Patient Health Questionnaire; TKA, total knee arthroplasty; WOMAC, Western Ontario-McMaster Universities OA Index.