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Retroverting Periacetabular Osteotomy for Symptomatic Acetabular Anteversion.

Ryan S Selley1, Jeffrey B Peck2, Zachary A Trotzky3

  • 1Department of Orthopedic Surgery, Northwestern Memorial Hospital, Chicago, Illinois.

The Journal of Arthroplasty
|November 16, 2023
PubMed
Summary

Periacetabular osteotomy (PAO) provides significant hip dysplasia improvement for Ottawa A patients. Outcomes are comparable to traditional dysplasia treatments, with high rates of clinical improvement.

Keywords:
Ottawa Aacetabular anteversionhip dysplasiahip painperiacetabular osteotomy

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Area of Science:

  • Orthopedic surgery
  • Hip biomechanics
  • 3D imaging in orthopedics

Background:

  • Acetabular dysplasia traditionally assessed by lateral center edge angle.
  • Ottawa classification offers 3D quantification of hip dysplasia.
  • Ottawa A signifies dysplasia from excessive acetabular anteversion or anterior under-coverage.

Purpose of the Study:

  • Evaluate periacetabular osteotomy (PAO) outcomes in Ottawa A hip dysplasia.
  • Compare PAO results for Ottawa A dysplasia versus traditional dysplasia cohorts.
  • Assess patient-reported outcomes and clinical benefit achievement.

Main Methods:

  • Retrospective study comparing PAO for Ottawa A dysplasia (17 patients, 21 hips) with a control group (69 patients, 88 hips).
  • Utilized modified Harris Hip Score and International Hip Outcome Tool-33 for pre- and post-operative assessment.
  • Follow-up averaged 2.3 years.

Main Results:

  • Both groups showed significant improvements in functional scores (P < .001).
  • No significant differences in outcome measures or achievement of minimal clinically important difference (MCID) or substantial clinical benefit between groups.
  • MCID rates: 82.4-100%; substantial clinical benefit rates: 47.1-52.9%.

Conclusions:

  • PAO for Ottawa A hip dysplasia leads to significant patient-reported outcome improvements.
  • High rates of MCID achievement are expected for Ottawa A dysplasia treated with PAO.
  • Outcomes are comparable to those for traditional hip dysplasia parameters.