Table 1.
Characteristics of the study subjects
| No stratification | Stratified ± ROA at examination A | References | ||
|---|---|---|---|---|
| n = 141 (100%) | -ROA, n = 63 (45%) | +OA, n = 78 (55%) | n = 17 (100%) | |
| Men | 116 (82%) | 49 (78%) | 67 (86%) | 15 (88%) |
| Age at examination A, years | 51 (31-73) | 51 (32-73) | 52 (31-73) | 54 (37-70) |
| BMI at examination A, kg/m2 | 26 (18-41) | 26 (18-35) | 27 (21-41) | 26 (20-31) |
| Years between index surgery and examination A | 18 (15-22) | 18 (15-22) | 18 (15-22) | Na |
| Years between examinations A and B | 7.5 (4.0-10.4) | 7.1 (4.0-10.1) | 7.8 (4.0-10.4) | 8.6 (8.6-8.8) |
| ROA at examination A | 78 (55%) | 0 (0%) | 78 (100%) | 1 (6%) |
| ROA at examination B | 106 (75%) | 28 (44%) | 78 (100%) | 1 (6%) |
| End-stage OA at examination B | 31 (22%) | 2 (3.2%) | 29 (37%) | 0 (0) |
| Arthroplasty or osteotomy at examination B | 2 (1.4%)a | 0 (0) | 2 (2.6%)a | 0 (0) |
| Loss of joint space/Progression of the JSN score | 76 (54%) | 22 (35%) | 54 (69%) | 2 (12%) |
| Progression of osteophytes | 66 (47%) | 21 (33%) | 45 (58%) | 2 (12%) |
| Progression of ROA | 98 (70%) | 35 (56%) | 63 (81%) | 4 (24%) |
| SF ARGS at examination A, pmol ARGS/ml | 6.95 (0.15-15.07) | 6.96 (0.15-14.58) | 6.94 (0.31-15.07) | Nd |
| SF ARGS at examination B, pmol ARGS/ml | Nd | Nd | Nd | 7.19 (3.63-12.72) |
aOne arthroplasty and one osteotomy. Na, not applicable; Nd, not determined. Values are expressed as numbers (%) or mean (range). BMI, body mass index; JSN, joint space narrowing; OA, osteoarthritis; ROA, radiographic OA.