Table 2.
Statistical comparison of X-ray and MRI features of hips in HC, AS and OA subjects.
| X ray | Number of individuals | Joint width (mm) | Osteophytes | Subchondral sclerosis | Femoral head deformity | |||
|---|---|---|---|---|---|---|---|---|
| HC | 200 | 4.8 ± 0.74 | 1% | 2% | 0 | |||
| AS | 300 | 1.5 ± 0.8*# | 2%# | 22%*# | 1%# | |||
| OA | 44 | 3.2 ± 0.7*# | 29%*# | 87%*# | 32%*# | |||
| MRI | Number of individuals | BME lesions in trochanters | Superficial BME lesions in femoral heads | Superficial BME lesions in acetabula | Deep BME lesions in femoral heads | Deep BME lesions in acetabula | Cysts in femoral heads | Cysts in acetabula |
| HC | 200 | 0% | 1% | 1% | 0% | 0% | 0% | 0% |
| AS | 300 | 14%*# | 56%*# | 38%*# | 29%*# | 13%*# | 0%# | 10%*# |
| OA | 44 | 0%# | 30%*# | 2%# | 4%# | 1%# | 14%*# | 0%# |
HC, Healthy control; AS, Ankylosing Spondylitis; OA, Osteoarthritis; BME, bone marrow edema. Numbers in mean ± SD. statistically different from healthy control, p < 0.05~0.0001; # statistically different between AS and OA, p < 0.05~0.0001. All MRI lesions were observed with the STIR sequences.