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

To identify factors associated with residual pelvic obliquity (PO) one year after total hip arthroplasty (THA) in patients with dysplastic hip osteoarthritis (DHOA) and to establish a clinical threshold for lumbar bending range (LBR), which may enhance patient outcomes.

Key Findings:
  • Decreased affected-side lumbar bending range is associated with residual pelvic obliquity after THA, indicating a need for targeted preoperative assessments.
  • A clinically significant pelvic obliquity threshold of ≥ 2° was established, which can guide surgical planning.
  • Patients with lower affected-side lumbar bending range are more likely to have persistent pelvic obliquity, suggesting a focus area for rehabilitation.
Interpretation:

The study suggests that lumbar flexibility, particularly on the affected side, plays a crucial role in postoperative pelvic alignment, highlighting the need for preoperative assessment of lumbar bending range to improve surgical outcomes.

Limitations:
  • Retrospective design may introduce selection bias, potentially affecting the reliability of the findings.
  • Exclusion of patients with upward pelvic obliquity limits generalizability to a broader patient population.
  • Potential confounding factors not fully controlled may influence the results.
Conclusion:

Establishing a lumbar bending range threshold can aid in predicting residual pelvic obliquity after THA, enhancing preoperative evaluations and ultimately improving patient outcomes.

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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