Clinical Orthopaedics and Related Research®

, Volume 469, Issue 6, pp 1735–1742 | Cite as

Pelvic Deformity Influences Acetabular Version and Coverage in Hip Dysplasia

  • Masanori Fujii
  • Yasuharu Nakashima
  • Taishi Sato
  • Mio Akiyama
  • Yukihide Iwamoto
Clinical Research

Abstract

Background

Although a wide variety of acetabular deformities in developmental dysplasia of the hip (DDH) have been reported, the morphologic features of the entire pelvis in DDH are not well characterized and their correlation with acetabular deformity is unknown.

Questions/purposes

We determined whether there was a rotational deformity of the entire innominate bone, and if so, whether it related to acetabular version and coverage.

Patients and Methods

We examined the morphologic features of the pelvis using CT for 50 patients with DDH (82 hips). Forty normal hips were used as controls. The innominate rotation angle was determined at three levels in the axial plane. The acetabular sector angle served as an indicator of acetabular coverage of the femoral head. We evaluated the association between innominate rotation angles and acetabular version and coverage.

Results

We observed greater internal rotation of the innominate bone in patients with DDH than in the control subjects. Internal rotation of the innominate bone was associated with increased acetabular anteversion angle and acetabular inclination angle. In hips with acetabular retroversion (nine of 82 hips; 11.0 %), the entire innominate bone was externally rotated, compared with hips with acetabular anteversion. Internal rotation of the innominate bone also was associated with decreased anterior and superior acetabular coverage.

Conclusion

Our observations suggest structural abnormalities exist throughout the pelvis in DDH, and the morphologic abnormalities of the acetabulum are not caused solely by local dysplasia around the hip, but are influenced by the morphologic features of the entire pelvis.

Level of Evidence

Level IV, prognostic study. See Guidelines for Authors for a complete description of levels of evidence.

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Copyright information

© The Association of Bone and Joint Surgeons® 2010

Authors and Affiliations

  • Masanori Fujii
    • 1
  • Yasuharu Nakashima
    • 1
  • Taishi Sato
    • 1
  • Mio Akiyama
    • 1
  • Yukihide Iwamoto
    • 1
  1. 1.Department of Orthopaedic Surgery, Graduate School of Medical ScienceKyushu UniversityFukuokaJapan

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