Clinical cutoff value of lumbar bending range for predicting residual pelvic obliquity after total hip arthroplasty in dysplastic hip osteoarthritis - Report - MDSpire

Clinical cutoff value of lumbar bending range for predicting residual pelvic obliquity after total hip arthroplasty in dysplastic hip osteoarthritis

  • By

  • Hiroyuki Yokoi

  • Yusuke Osawa

  • Yuto Ozawa

  • Hiroto Funahashi

  • Yasuhiko Takegami

  • Shiro Imagama

  • May 17, 2026

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Clinical Report: Lumbar Flexibility Threshold and Pelvic Obliquity Post-THA

Overview

This study identifies a specific lumbar bending range (LBR) threshold associated with residual pelvic obliquity (PO) one year after total hip arthroplasty (THA) in patients with dysplastic hip osteoarthritis (DHOA). It highlights the importance of preoperative assessment of lumbar flexibility in predicting postoperative outcomes.

Background

Dysplastic hip osteoarthritis often leads to coronal pelvic obliquity and leg length discrepancies, which can significantly impair patient function and quality of life. Understanding the relationship between lumbar flexibility and pelvic alignment post-THA is crucial for optimizing surgical outcomes and improving patient satisfaction. This study aims to establish a clinical threshold for lumbar flexibility that can predict residual pelvic obliquity after surgery.

Data Highlights

ParameterValue
Study Population98 patients with D-PO
Significant PO ImprovementPO < 2° at 1 year
Residual POPO ≥ 2° at 1 year

Key Findings

  • Patients with decreased affected-side lumbar bending range (LBR) are more likely to have residual pelvic obliquity after THA.
  • A specific cutoff value for LBR was identified that predicts residual PO one year postoperatively.
  • Coronal alignment maintenance post-THA is influenced by both hip reconstruction and lumbar flexibility.
  • Downward pelvic obliquity is more common and often improves postoperatively compared to upward pelvic obliquity.
  • Preoperative assessment of lumbar flexibility is essential for surgical planning in patients with DHOA.

Clinical Implications

Clinicians should assess lumbar flexibility preoperatively to better predict pelvic alignment outcomes after THA. Identifying patients with low affected-side LBR can guide surgical strategies to optimize postoperative alignment and improve patient satisfaction.

Conclusion

This study underscores the importance of lumbar flexibility in predicting pelvic obliquity after THA in patients with dysplastic hip osteoarthritis. Establishing a clinical threshold for LBR can enhance preoperative evaluations and surgical planning.

Related Resources & Content

  1. Author(s)/Org, Source, Year -- Title
  2. conexiant, Not All Hips Follow the Same Rules in THA
  3. Author(s)/Org, Source, Year -- Prevalence of Lumbopelvic Misalignment
  4. Author(s)/Org, Source, Year -- Postural Changes in Pelvic Obliquity
  5. The Interconnection Between Hip and Spine: Clinical Insights and Biomechanical Considerations
  6. Direction of pelvic obliquity after total hip arthroplasty
  7. Three-dimensional pelvic kinematics in healthy, total hip arthroplasty, and lumbar fusion patients
  8. Clinical validation of a deep learning tool for characterizing spinopelvic mobility in total hip arthroplasty | Scientific Reports
  9. Association between physical measures of spinopelvic alignment and physical functioning with patient reported outcome measures after total hip arthroplasty: Systematic review and narrative synthesis | PLOS One
  10. Comparison of Outcomes in Dual-Mobility Versus Fixed-Bearing Implants in Primary Total Hip Arthroplasty: A Systematic Review and Meta-Analysis - PMC

Original Source(s)

Clinical cutoff value of lumbar bending range for predicting residual pelvic obliquity after total hip arthroplasty in dysplastic hip osteoarthritis

  • by Hiroyuki Yokoi, Yusuke Osawa, Yuto Ozawa, Hiroto Funahashi, Yasuhiko Takegami, Shiro Imagama

  • May 17, 2026

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