All patients

SSPSF (n = 10)

LSPSF (n = 29)

p-value

Immediately post-op

9.0 (SD 4.81)

0.35 (SD 6.88)

< 0.001

1-year post-operatively

16.5 (SD 5.63)

3.46 (SD 8.01)

< 0.001

Change over 1 year

7.5 (SD 3.64)

3.11 (SD 4.77)

< 0.001

Subgroup of patients without fusion

SSPSF (n = 10)

LSPSF (n = 18)

Immediately post-op

9 (SD 4.81)

0.7 (SD 5.82)

< 0.001

1-year post-operatively

16.5 (SD 5.38)

2.81 (SD 7.34)

< 0.001

Change over 1 year

7.5 (SD 3.64)

1.39 (SD 6.13)

< 0.001

Subgroup of patients undergoing LSPSF

Fusion (n = 11)

No fusion (n = 18)

Immediately post-op

2.08 (SD 8.33)

0.7 (SD 5.82)

0.23

1-year post-operatively

4.52 (SD 9.02)

2.81 (SD 7.39)

0.21

Change over 1 year

2.45 (SD 3.64)

1.39 (SD 6.13)

0.12