title: Changes in spino-pelvic alignment after surgical treatment of isthmic spondylolisthesis.
abstract: OBJECTIVE
  To analyze the changes in spino-pelvic parameters after surgical treatment of lumbar isthmic spondylolisthesis.
  
  
  METHODS
  Sixty patients recruited from a group of consecutive series of 128 cases with isthmic spondylolisthesis operated on between 2002 and 2012 in the Department of Neurosurgery, Tarnow, Poland. All patients were operated on by the same surgeon (the first author). Spino-pelvic parameters: PI, SS, PT, LSA, and LL were measured manually on standing lateral view radiograms. Patients were divided according to Spinal Deformity Study Group classification which we modified for means of analysis: (A) low-grade group: subgroups with balanced pelvis and unbalanced pelvis (instead of normal and high PI subgroups), (B) high-grade group: subgroups with balanced and unbalanced pelvis.
  
  
  RESULTS
  Twenty-nine patients had unbalanced pelvis before the operation. In 10 of them (34%), the procedure resulted in full correction of pelvis position meaning that they achieved balanced pelvis after the surgery. There were 6 patients with low-grade slip who had balanced pelvis preoperatively but showed unbalanced pelvis after the surgery but this loss of balanced pelvis did not affect the clinical outcome which overall was good among them. Patients with unbalanced pelvis presented changes towards restoration of spino-sacro-pelvic anatomy postoperatively: PT decreased while SS increased, although these changes were not statistically significant.
  
  
  CONCLUSIONS
  Further studies are needed to confirm whether surgical correction of spino-pelvic parameters results in better clinical outcome in patients with isthmic spondylolisthesis.
authors.affiliation: Department of Neurosurgery, Tarnów, Poland; Faculty of Medicine, University of Rzeszów, Poland. Electronic address: amac@mp.pl.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Maciejczak
authors.affiliation: Faculty of Medicine, University of Rzeszów, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Jabłońska
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Danuta
authors.initials: D
authors.lastname: Bączek
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Barnaś
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Czternastek
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Dudziak
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Filip
authors.initials: F
authors.lastname: Georgiew
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Barbara
authors.initials: B
authors.lastname: Jagiełło-Bajer
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Litwora
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Maślanka
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Robert
authors.initials: R
authors.lastname: Konior
authors.affiliation: Department of Neurosurgery, Tarnów, Poland.
authors.forename: Janusz
authors.initials: J
authors.lastname: Orzech
mesh_terms: D019299:Decompression, Surgical / Q000379:methods; D005260:Female; D006801:Humans; D008141:Lordosis / Q000601:surgery; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D010388:Pelvis / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D011859:Radiography; D012445:Sacrococcygeal Region; D013123:Spinal Fusion / Q000379:methods; D013131:Spine / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D013168:Spondylolisthesis / Q000000981:diagnostic imaging / Q000601:surgery*; D016896:Treatment Outcome
keywords: Isthmic spondylolisthesis; Sacro-pelvic parameters; Spino-pelvic balance