Table 1. Comparison of Baseline Characteristics and Patient-Reported Outcome Measures.
| Characteristic | Participants, No. (%) | |
|---|---|---|
| Predictive tool (n = 105) | Treatment as usual (n = 106) | |
| Demographics | ||
| Age, mean (SD), y | 65.4 (8.43) | 66.2 (8.16) |
| Sex | ||
| Female | 53 (50.5) | 65 (61.3) |
| Male | 52 (49.5) | 41 (38.7) |
| BMI, mean (SD) | 30.2 (6.42) | 31.4 (7.26) |
| Previous knee surgery | ||
| No | 66 (62.9) | 69 (65.1) |
| Yes | 39 (37.1) | 37 (34.9) |
| Time with knee symptoms, mean (SD), y | 7.71 (6.64) | 7.70 (6.12) |
| Smoking status | ||
| Never | 58 (55.2) | 63 (59.4) |
| Former | 41 (39.0) | 41 (38.7) |
| Current | 6 (5.7) | 2 (1.9) |
| Comorbidities | ||
| Cardiac | ||
| No | 92 (87.6) | 93 (87.7) |
| Yes | 13 (12.4) | 13 (12.3) |
| Respiratory | ||
| No | 101 (96.2) | 103 (97.2) |
| Yes | 4 (3.8) | 3 (2.8) |
| Mental health | ||
| No | 96 (91.4) | 97 (91.5) |
| Yes | 9 (8.6) | 9 (8.5) |
| Diabetes | ||
| No | 95 (90.5) | 93 (87.7) |
| Yes | 10 (9.5) | 13 (12.3) |
| Previous nonsurgical OA treatment a | ||
| Lifestyle changes | ||
| No | 33 (31.4) | 21 (19.8) |
| Yes | 72 (68.6) | 85 (80.2) |
| Physical therapy | ||
| No | 45 (42.9) | 48 (45.3) |
| Yes | 60 (57.1) | 58 (54.7) |
| Nonopioid analgesia | ||
| No | 26 (24.8) | 20 (18.9) |
| Yes | 79 (75.2) | 86 (81.1) |
| Opioid analgesia | ||
| No | 89 (84.8) | 88 (83.0) |
| Yes | 16 (15.2) | 18 (17.0) |
| Intra-articular steroid injection | ||
| No | 83 (79.0) | 81 (76.4) |
| Yes | 22 (21.0) | 25 (23.6) |
| Recruitment site | ||
| Private (HCF) | 94 (89.5) | 94 (88.7) |
| Public (SVHM) | 11 (10.5) | 12 (11.3) |
| Baseline willingness for surgery | ||
| Willing | 61 (61.0) | 74 (69.8) |
| Not willing | 41 (39.0) | 32 (30.2) |
| EQ5D dimension | ||
| Mobility | ||
| I have no problems with walking about | 23 (21.9) | 19 (17.9) |
| I have some problems with walking about | 82 (78.1) | 87 (82.1) |
| I am confined to bed | 0 | 0 |
| Self-care | ||
| I have no problems with self-care | 95 (90.5) | 91 (85.8) |
| I have some problems with washing or dressing myself | 10 (9.5) | 15 (14.2) |
| I am unable to wash or dress myself | 0 | 0 |
| Usual activities | ||
| I have no problems with performing my usual activities | 30 (28.6) | 25 (23.6) |
| I have some problems with performing my usual activities | 72 (68.6) | 75 (70.8) |
| I am unable to perform my usual activities | 3 (2.9) | 6 (5.7) |
| Pain or discomfort | ||
| I have no pain or discomfort | 4 (3.8) | 0 |
| I have moderate pain or discomfort | 85 (81.0) | 83 (78.3) |
| I have extreme pain or discomfort | 16 (15.2) | 23 (21.7) |
| Anxiety or depression | ||
| I am not anxious or depressed | 72 (68.6) | 75 (70.8) |
| I am moderately anxious or depressed | 33 (31.4) | 29 (27.4) |
| I am extremely anxious or depressed | 0 | 2 (1.9) |
| Veterans-RAND 12 component score, mean (SD) | ||
| Mental | 52.5 (10.8) | 49.9 (11.1) |
| Physical | 35.5 (7.72) | 35.1 (8.23) |
| Utility | 0.72 (0.13) | 0.69 (0.14) |
Abbreviations: BMI, body mass index (measured as weight in kilograms divided by height in meters squared); EQ5D, EuroQol 5 Dimensions; HCF, Hospitals Contribution Fund; OA, osteoarthritis; SVHM, St Vincent’s Hospital, Melbourne.
a
Participants were asked (binary outcome) whether they had ever received or used any of the nonsurgical OA treatments in the past for their knee.