Table 2.
Hip features of study participants at baseline
| Hip radiographic feature at baseline | All participants | Caucasian | AA | P a |
|---|---|---|---|---|
| n = 1422 | n = 1054 | n = 368 | ||
| KL grade | ||||
| 0: No hip OA % | 15.3 | 17.3 | 9.5 | <0.0001b |
| 1: Questionable hip OA % | 61.6 | 59.3 | 68.5 | |
| 2: Mild hip OA % | 21.6 | 22.2 | 19.7 | |
| 3: Moderate hip OA % | 1.3 | 1.1 | 1.9 | |
| 4: Severe hip OA % | 0.2 | 0.1 | 0.4 | |
| JSN | ||||
| Axial | ||||
| None % | 77.7 | 75.9 | 82.9 | <0.0001 |
| Mild % | 21.6 | 23.7 | 15.7 | |
| Moderate/severe % | 0.7 | 0.4 | 1.4 | |
| Superior | ||||
| None % | 91.6 | 92.7 | 88.5 | 0.0011 |
| Mild % | 7.8 | 6.9 | 10.4 | |
| Moderate/severe % | 0.6 | 0.4 | 1.1 | |
| Medial | ||||
| None % | 98.2 | 98.2 | 98.1 | 0.8599b |
| Mild % | 1.8 | 1.7 | 1.9 | |
| Moderate/severe % | 0.1 | 0.1 | 0 | |
| Subchondral | ||||
| Cysts % | 4.1 | 3.9 | 4.5 | 0.5193 |
| Sclerosis % | 14.1 | 14.5 | 13.1 | 0.3337 |
| Medial osteophytes | ||||
| Severity | ||||
| None % | 92.1 | 92.6 | 90.8 | 0.2221 |
| Mild % | 6.8 | 6.3 | 8.2 | |
| Moderate/severe % | 1.1 | 1.1 | 1.0 | |
| Location | ||||
| None % | 92.2 | 92.6 | 91.0 | 0.0353 |
| Acetabular only % | 2.9 | 2.4 | 4.4 | |
| Femoral only % | 3.5 | 3.7 | 3.0 | |
| Both % | 1.4 | 1.3 | 1.6 | |
| Lateral osteophytes | ||||
| Severity | ||||
| None % | 42.8 | 46.0 | 33.9 | <0.0001 |
| Mild % | 48.6 | 46.5 | 54.6 | |
| Moderate/severe % | 8.5 | 7.5 | 11.4 | |
| Location | ||||
| None % | 42.8 | 46.0 | 33.7 | <0.0001 |
| Acetabular only % | 40.8 | 38.2 | 48.1 | |
| Femoral only % | 4.7 | 5.1 | 3.6 | |
| Both % | 11.7 | 10.7 | 14.7 |
aChi-square or Fisher’s Exact p-value comparing Caucasians to African Americans (AAs). bFisher’s exact test p value. KL Kellgren–Lawrence, OA osteoarthritis, JSN joint space narrowing