Group A

n.

Group B

n.

Group C

n.

Central lumbar canal stenosis

4

Unilateral foraminal and lateral recess stenosis without disc prolapse

20

Unilateral foraminal and lateral recess stenosis without disc prolapse

30

Mixed(lateral and central)LSS

2

Unilateral foraminal and lateral recess stenosis with posterolateral disc prolapse

10

Unilateral foraminal and lateral recess stenosis with posterolateral disc prolapse

6

Degenerative LSS with facet cyst single level

1

Bilateral foraminal and lateral recess stenosis without disc prolapse

13

Bilateral foraminal and lateral recess stenosis without disc prolapse

13

Degenerative LSS with acute disc prolapse single level

5

Bilateral foraminal and lateral recess stenosis with disc prolapse

4

Unstable LSS with two levels disc prolapse

3

Unstable LSS with one level disc prolapse

2

Unstable LSS with degenerative scoliosis small curve from L2 to L5

3

Unstable LSS with degenerative scoliosis big curve from L2 to L5

1