With Spider arm

Without Spider arm

Student’s t-test (p < 0.05)

Surgery time (minutes)

129 ± 16

122 ± 18

n.s.

Blood loss (ml)

397 ± 172

477 ± 196

n.s.

Cup abduction angle (degree)

40.9 ± 5.1

41.7 ± 5.6

n.s.

Cup anteversion (degree)

13.7 ± 3.5

12.9 ± 3.9

n.s.

Leg length discrepancy (mm)

1.85 ± 2.9

0.85 ± 3.7

n.s.