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Table 1 Baseline patient characteristics

From: Lantern-shaped screw loaded with autologous bone for treating osteonecrosis of the femoral head

Characteristic Lantern-shaped screw group (n = 16) Control group (n = 16) p value
Mean age (range), yr. 31.5 ± 1.9 (16–47) 32.6 ± 1.7 (18–44) 0.6622
Female/ male, n 3/ 13 4/ 12 1.0000
Right/ left hip involved, n 9/ 7 10/ 6 0.7189
Body mass index (range), kg/cm2 24.9 ± 0.5 (21–27) 24.3 ± 0.5 (21–26) 0.3978
Etiology    0.4652
 Nontraumatic, n 9 11  
 Traumatic, n 7 5  
Duration of illness (range), mo 18.8 ± 2.0 (9–36) 20.5 ± 1.8 (11–38) 0.5379
ARCO stage (II/ III) 7/ 9 8/ 8 0.7232
 Bone marrow edema of hip (III) 5 6 0.7097
Mean operation time (range), min 80.13 ± 3.3 (56–105) 71.4 ± 3.1 (45–90) 0.0621
Mean blood loss (range), mL 180.6 ± 14.9 (110–350) 158.8 ± 13.7 (90–280) 0.2892
Harris hip score
 Pre-operation (range) 60.3 ± 1.8 (48–72) 61.1 ± 2.0 (48–76) 0.7457
 12 months (range) 86.3 ± 0.98 (81–94) 80.8 ± 1.5 (67–90) 0.0054
 24 months (range) 85.6 ± 1.3 (70–92) 79.4 ± 1.7 (64–91) 0.0078
 36 months (range) 85.2 ± 1.7 (68–95) 78.2 ± 2.2 (64–93) 0.0173
Successful clinical results (%) 15 (94) 10 (63) 0.0325
Successful radiological results (%) 14 (88) 8 (50) 0.0221