Group A

n.

Group B

n.

Group C

Bilateral decompression laminectomy, facetectomy from L2 to L5 and correction of degenerative scoliosis by fusion

4

Bilateral endoscopic lamioforaminectomy with discectomy

4

Unilateral microscopic lamino-foraminotomy and discectomy one level

Laminectomy and medial facetectomy, discectomy, cage with TLIF fusion

2

Bilateral endoscopic lamioforaminectomy without discectomy

13

Unilateral microscopic lamino-foraminotomy two levels

Laminectomy and medial facetectomy, discectomy with PLI fusion

3

Endoscopic unilateral decompression with discectomy

10

Bilateral microscopic lamino-foraminotomy without discectomy

Classic laminectomy and discectomy

5

Endoscopic unilateral decompression without discectomy

20

Unilateral microscopic laminectomy with discectomy two levels

Decompression laminectomy, facetectomy and fusion

1

Unilateral microscopic lamino-foraminotomy one level

Laminectomy and artherectmy

2

Unilateral microscopic laminectomy

Weiner technique

1

Hinge osteotomy

1

Classic laminectomy and bilateral foraminectomy

2