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Sagittal spinopelvic alignment predicts hip function after total hip arthroplasty.

Hironori Ochi1, Yasuhiro Homma1, Tomonori Baba1

  • 1Department of Orthopaedic Surgery, Juntendo University 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

Gait & Posture
|December 28, 2016
PubMed
Summary

Preoperative sagittal spinopelvic alignment significantly impacts total hip arthroplasty (THA) outcomes. Imbalanced alignment, like a larger sagittal vertical axis, correlates with poorer function after THA.

Keywords:
Hip functionSagittal alignmentSagittal vertical axisSpinopelvicTotal hip arthroplasty

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Area of Science:

  • Orthopedics
  • Spine Surgery
  • Biomechanical Engineering

Background:

  • Total hip arthroplasty (THA) aims to restore hip function.
  • Sagittal spinopelvic alignment is crucial for overall biomechanics.
  • The relationship between preoperative alignment and THA outcomes requires further investigation.

Purpose of the Study:

  • To investigate the association between preoperative sagittal spinopelvic alignment and postoperative clinical outcomes after total hip arthroplasty (THA).
  • To identify specific sagittal spinopelvic parameters influencing gait and functional activities post-THA.

Main Methods:

  • Retrospective study of 92 patients undergoing primary THA.
  • Radiographic assessment of sagittal spinopelvic parameters (e.g., sagittal vertical axis, pelvic tilt, lumbar lordosis).
  • Evaluation of postoperative outcomes using modified Harris Hip Scores (gait and functional activities).
  • Multivariate linear regression analysis to determine associations.

Main Results:

  • Preoperative sagittal vertical axis, pelvic tilt, sacral slope, and pelvic incidence minus lumbar lordosis angle were associated with postoperative gait scores.
  • Sagittal vertical axis and pelvic incidence minus lumbar lordosis angle were related to postoperative functional activities scores.
  • Imbalanced sagittal alignment (larger sagittal vertical axis, pelvic incidence minus lumbar lordosis, pelvic retroversion) correlated with poorer outcomes.

Conclusions:

  • Preoperative sagittal spinopelvic alignment is a significant predictor of postoperative clinical outcomes in THA patients.
  • Specific alignment parameters influence gait and functional recovery.
  • Pelvic anteversion may indicate a compensatory ability for abnormal sagittal alignment.