Table 1.
Subject Characteristics and Hip and Knee Characteristics of Participants with Unilateral Hip Pain and Participants with Asymmetric Radiographic Hip OA (RHOA)
| Baseline&
Subject Characteristic |
Unilateral Hip Pain (n=279) |
Asymmetric RHOA (n=483) | ||
| Age yrs, median(IQR) # | 61 (54–70) | 63 (54–70) | ||
| BMI, mean (IQR) kg/m2 | 27.7 (24.3–31.1) | 27.7 (24.6–30.8) | ||
| Female, n (%) | 195 (69.9) | 232 (48.0) | ||
| Baseline&
Hip and Knee Characteristic |
Limbs with Hip Pain |
Contralateral Limbs* |
Limbs with worse RHOA |
Contralateral Limbs** |
| Radiographic hip OA, n (%) | ||||
| Normal | 198 (77.7) | 194 (76.1) | 0 (0.0) | 336 (69.6) |
| Possible | 35 (13.7) | 38 (14.9) | 262 (54.2) | 147 (30.4) |
| Definite | 22 (8.63) | 23 (9.0) | 221 (45.8) | 0 (0) |
| Hip pain on most days of month, n (%) | 279(100.0) | 0 (0.0) | 88 (18.3) | 79 (16.4) |
| Knee pain (WOMAC 0–20), median (IQR) | 1 (0–4) | 2 (0–5) | 1 (0–4) | 1 (0–4) |
| Knee K-L grade, n (%) | ||||
| 0 | 129 (46.2) | 126 (45.2) | 185 (38.3) | 178 (36.9) |
| 1 | 41 (14.7) | 51 (18.3) | 92 (19.1) | 93 (19.3) |
| 2 | 63 (22.6) | 62 (22.2) | 141 (29.2) | 133 (27.5) |
| 3 | 46 (16.5) | 40 (14.3) | 65 (13.5) | 79 (16.4) |
| Knee JSN (maximum of medial and lateral) | ||||
| 0 | 167 (59.9) | 178 (63.8%) | 276 (57.1%) | 265 (54.8%) |
| 1 | 70 (25.1%) | 66 (23.7%) | 142 (29.4%) | 139 (28.8%) |
| 2 | 42 (15.1% | 35 (12.5%) | 65 (13.5%) | 79 (16.4%) |
&
Baseline characteristics for the unilateral hip pain sample are from 12-month contacts since pain asymmetry was defined over 3 visits from baseline to 24 months
#
IQR – interquartile range; BMI = body mass index; JSN = joint space narrowing
*
An individual’s contralateral knee and hip are opposite the side with hip pain.
**
An individual’s contralateral knee and hip are opposite the side with worse RHOA.