Mechanical complications and patient-reported outcome measures associated with high pelvic incidence and persistent pelvic retroversion: the Roussouly “false type 2” profile

Thamrong Lertudomphonwanit, Munish C. Gupta, Alekos A. Theologis, Julio J. Jauregui, Lawrence G. Lenke, Keith H. Bridwell, James P. Wondra, Michael P. Kelly

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE The objective of this paper was to report mechanical complications and patient-reported outcome measures (PROMs) for adult spinal deformity (ASD) patients with a Roussouly “false type 2” (FT2) profile. METHODS ASD patients treated from 2004 to 2014 at a single center were identified. Inclusion criteria were pelvic incidence ≥ 60° and a minimum 2-year follow-up. FT2 was defined as a high postoperative pelvic tilt (PT), as defined by the Global Alignment and Proportion target, and thoracic kyphosis < 30°. Mechanical complications, defined as proximal junctional kyphosis (PJK) and/or instrumentation failure, were determined and compared. Scoliosis Research Society–22r (SRS-22r) scores were compared between groups. RESULTS Ninety-five patients (normal PT [NPT] group 49, FT2 group 46) who met the inclusion criteria were identified and studied. Most surgeries were revisions (NPT group 30 [61%], FT2 group 30 [65%]), and most were performed via a posterior-only approach (86%) (mean ± SD 9.6 ± 5 levels). Proximal junctional angles increased after surgery in both groups, without differences between groups. Neither rates of radiographic PJK (p = 0.10), revision for PJK (p = 0.45), nor revision for pseudarthrosis (p = 0.66) were different between groups. There were no differences between groups for SRS-22r domain scores or subscores. CONCLUSIONS In this single-center experience, patients with high pelvic incidence fixed with persistent lumbopelvic parameter mismatch and engaged compensatory mechanisms (Roussouly FT2) had mechanical complications and PROMs not different from those with normalized alignment parameters. Compensatory PT may be acceptable in some cases of ASD surgery.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalJournal of Neurosurgery: Spine
Volume39
Issue number2
DOIs
StatePublished - Aug 2023

Keywords

  • Roussouly false type 2
  • adult spinal deformity
  • high pelvic tilt
  • sagittal plane
  • surgical outcomes

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