From: Understanding the pros and cons of spine surgery for ankylosing spondylitis: experience from a single institution study
Minimum
Maximum
Mean
Std. Deviation
Thoracic Kyphosis
25
115
72.45
22.545
LL
-18
26
9.00
25.803
Pre-op SVA
79
331
179.35
75.816
Post-op SVA
9
210
65.80
50.104