Pelvic Tilt Displacement Before and After Artificial Hip Joint Replacement Surgery

Toru Nishiwaki, Ryosuke Hata, Akihito Oya, Masaya Nakamura, Morio Matsumoto, Arihiko Kanaji

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Background: Prediction of pelvic displacement before total hip arthroplasty (THA) is important for accurate acetabular implant placement. This study aimed to evaluate the effect of contralateral joint conditions on pelvic displacement after THA. Methods: A total of 355 cases that underwent computed tomography before and after THA for osteoarthritis due to developmental dysplasia were assessed. The pelvic plane was based on preoperative and postoperative day 1 computed tomography images. The displacement in the anteversion direction was expressed as +. Subjects with a minimal joint space <2 mm in the contralateral hip joint were in group N; subjects with ≥2 mm were in group W; subjects with THA were in group P; and subjects who underwent THA simultaneously on both sides were in group B. The Bartlett test was used when conducting the equal variance test among the groups. The F test was used for pairwise comparison. A P value <.01 was considered statistically significant. Results: Groups N, W, P, and B had 49, 227, 55, and 24 cases, respectively, and their displacements were −0.2° ± 2.7° 0.8° ± 3.9° 0.5° ± 2.6° and 1.1° ± 4.0° respectively; the variance between the groups was significantly different (P =.0001). The differences between groups W and N (P =.0020), between groups W and P (P =.0003), and between groups P and B (P =.0086) were statistically significant. Conclusion: When the contralateral joint space is wide, the variance of the displacement is high. The contralateral joint affects pelvic displacement.

Original languageEnglish
Pages (from-to)925-930
Number of pages6
JournalJournal of Arthroplasty
Issue number3
Publication statusPublished - 2018 Mar


  • anterior pelvic plane
  • contralateral joint
  • functional pelvic plane
  • pelvic displacement
  • pelvic tilt
  • total hip arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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