Table 1 Baseline patient characteristics
Characteristic | Total | SIM Group | MD Group | P value |
|---|---|---|---|---|
Sex | Â | Â | Â | 0.479 |
 Men | 26 (72) | 13 (65) | 13 (81) | |
 Women | 10 (28) | 7 (35) | 3 (19) | |
Age (years) | ||||
 Mean | 41.6 ± 1.1 | 39.1 ± 1.4 | 44.7 ± 1.6 | 0.010 |
 Median | 42 (37.8–48) | 40 (36–44.5) | 45 (41.8–49) | 0.003a |
BMI (kg/m2) | ||||
 Mean | 25.6 ± 0.3 | 25.6 ± 0.4 | 25.6 ± 0.6 | 0.958 |
 Median | 25.2 (23.7–26.7) | 24.7 (23.5–26.7) | 25.3 (23.7–26.5) | 0.833a |
Duration of symptoms (months) | 3 (1–6.5) | 3 (1.13–8) | 2.5 (1–5.25) | 0.354 |
Laterality | Â | Â | Â | 0.878 |
 Unilateral | 14 (39) | 8 (40) | 6 (37) | |
 Bilateral | 22 (61) | 12 (60) | 10 (63) | |
Left: Right | 29:29 | 16:16 | 13:13 | 1.000 |
Cause of ANFH | Â | Â | Â | 0.640b |
 Steroids | 6 (10) | 3 (9) | 3 (11) | |
 Alcohol | 24 (41) | 15 (47) | 9 (35) | |
 Idiopathic | 28 ( ) | 14 (44) | 14 (54) | |
ARCO stage | Â | Â | Â | 0.108b |
 I | 10 (17) | 3 (9) | 7 (27) | |
 II a | 2 (3) | 1 (3) | 1 (4) | |
 II b | 12 (21) | 10 (32) | 2 (8) | |
 II c | 29 (50) | 16 (50) | 13 (50) | |
 IIIa | 5 (9) | 2 (6) | 3 (11) | |
Lesion size | Â | Â | Â | 0.021b |
 Small | 8 (14) | 2 (6) | 6 (23) | |
 Medium | 13 (22) | 11 (34) | 2 (8) | |
 Large | 37 (64) | 19 (60) | 18 (69) | |
Lesion location | Â | Â | Â | 0.770b |
 A | 2 (3) | 2 (6) | 0 (0) | |
 B | 26 (45) | 14 (44) | 12 (46) | |
 C1 | 15 (26) | 8 (25) | 7 (27) | |
 C2 | 15 (26) | 8 (25) | 7 (27) | |
Hydrarthrosis | Â | Â | Â | 0.985 |
 Yes | 20 (34) | 11 (34) | 9 (25) | |
 No | 38 (66) | 21 (66) | 17 (75) | |
VAS | 6.1 ± 1.2 | 6.2 ± 1.4 | 6.0 ± 1.1 | 0.546 |
HSS score | 66 ± 5.2 | 65 ± 5.7 | 68 ± 4.5 | 0.767 |