Table 1 The SINS classification according to Fisher et al. [[4]]

Location

 Junctional (occiput-C2, C7-T2, T11-L1, L5-S1)

3

 Mobile spine (C3-C6, L2-L4)

2

 Semirigid (T3-T10)

1

 Rigid (S2-S5)

0

Pain ^*

 Yes

3

 Occasional pain but not mechanical

1

 Pain-free lesion

0

Bone lesion

 Lytic

2

 Mixed (lytic/blastic)

1

 Blastic

0

Radiographic spinal alignment

 Subluxation/translation present

4

 De novo deformity (kyphosis/scoliosis)

2

 Normal alignment

0

Vertebral body collapse

  > 50% collapse

3

  < 50% collapse

2

 No collapse with > 50% body involved

1

 None of the above

0

Posterolateral involvement of spinal elements ^†

 Bilateral

3

 Unilateral

1

 None of the above

0