Anterior Approach (n = 97)

Posterior Approach (n = 48)

p

Age

69 (63 - 673.5) years

71 (67 - 77.5) years

0.008*

Gender

0.018*

Feminine

Masculine

44 (45.4%)

53 (59.6%)

12 (25%)

36 (75%)

Evolution time

5 (3 - 16) years

5 (2 - 17) years

0.823

Number of levels

2 (2 - 2)

2 (2 - 3)

0.847

Surgical Variables

Surgical time

Bleeding

Days of hospitalization

210 (156 - 240) min

150 (90 - 250) cc

6 (4 - 11) days

150 (120 - 180) min

200 (100 - 300) cc

5 (4 - 10) days

0.001*

0.203

0.455

Complications

17 (17.5%)

5 (10.4%)

0.261