Table 2.
Prevalence of radiographic change in siblings and controls. Values are numbers (percentages)
| Women
|
Men
|
||||
|---|---|---|---|---|---|
| Siblings (n=354) | Controls (n=981) | Siblings (n=250) | Controls (n=737) | ||
| Joint space narrowing (minimum hip joint space): | |||||
| >2.5 mm | 235 (66.4) | 874 (89.1) | 181 (72.4) | 693 (94.0) | |
| ⩽2.5 mm | 119 (33.6) | 107 (10.9) | 69 (27.6) | 44 (6.0) | |
| ⩽1.5 mm | 52 (14.7) | 40 (4.1) | 46 (18.4) | 15 (2.0) | |
| Bilateral ⩽2.5 mm | 47 (13.3) | 34 (3.5) | 29 (11.6) | 8 (1.1) | |
| Osteophyte grade*: | |||||
| 0 | 207 (64.5) | 924 (89.3) | 146 (64.9) | 652 (86.7) | |
| 1 | 56 (17.4) | 67 (6.5) | 31 (13.8) | 52 (6.9) | |
| 2 | 48 (15.0) | 39 (3.8) | 31 (13.8) | 41 (5.5) | |
| 3 | 10 (3.1) | 5 (0.5) | 17 (7.6) | 7 (0.9) | |
| Narrowing grade*: | |||||
| 0 | 162 (50.5) | 840 (81.2) | 118 (52.4) | 636 (84.6) | |
| 1 | 117 (36.4) | 153 (14.8) | 77 (34.2) | 94 (12.5) | |
| 2 | 29 (9.0) | 32 (3.1) | 16 (7.1) | 14 (1.9) | |
| 3 | 13 (4.0) | 10 (1.0) | 14 (6.2) | 8 (1.1) | |
| Overall grade: | |||||
| 0 | 131 (37.0) | 738 (75.2) | 104 (41.6) | 563 (76.4) | |
| 1 | 33 (9.3) | 54 (5.5) | 16 (6.4) | 59 (8.0) | |
| 2 | 86 (24.3) | 120 (12.2) | 47 (18.8) | 78 (10.6) | |
| 3 | 55 (15.5) | 39 (4.0) | 36 (14.4) | 21 (2.8) | |
| 4 | 14 (4.0) | 14 (1.4) | 18 (7.2) | 8 (1.1) | |
| 5 | 2 (0.6) | 3 (0.3) | 4 (1.6) | 2 (0.3) | |
| 3-5† | 103 (29.1) | 69 (7.0) | 83 (33.2) | 37 (5.3) | |
| Total hip replacement | 32 (9.0) | 13 (1.3) | 25 (10) | 6 (0.8) | |
*
Participants with bilateral total hip replacement excluded owing to inability to categorise osteophyte or narrowing.
†
Including total hip replacement.