Hip Pelvis.  2013 Mar;25(1):30-36. 10.5371/hp.2013.25.1.30.

Usefulness of a Modular Hip System for Combined Anteversion in Cementless Total Hip Arthroplasty

Affiliations
  • 1Department of Orthopedic Surgery, Konkuk University Medical Center, Seoul, Korea. damioh@gmail.com

Abstract

PURPOSE
The purpose of this study is to evaluate the usefulness of a modular total hip system for combined anteversion in cementless modular total hip arthroplasty.
MATERIALS AND METHODS
We performed twenty cementless modular total hip arthroplasty procedures. The patients lay in lateral position and 15degreesinternal rotation of the thigh. The surgeon inserted an acetabular cup component first, followed by a femoral component. He selected an appropriate modular neck component using an intra-operative manual combined anteversion test. All patients underwent post-operative computed tomography.
RESULTS
The average measurement of anteversion of the acetabular cup was 15.9+/-2.9degrees and anteversion of the femoral stem was 15.2+/-11.9degrees. Then, the combined anteversion was calculated to 24.0+/-8.2degrees. Significant difference was observed between combined anteversion and theoretical combined anteversion.
CONCLUSION
The method using an intra-operative manual combined anteversion test cannot realize the theoretical combined anteversion in cementless modular hip arthroplasty.

Keyword

Cementless modular total hip arthroplasty; Manual combined anteversion test

MeSH Terms

Arthroplasty
Hip
Humans
Neck
Thigh

Figure

  • Fig. 1 Intra-operative combined anteversion test by modular neck selection. (A) Figure shows cup and femoral stem are not in the coplanar plane with standard neck. (B) Figure shows cup and femoral stem are in the coplanar plane because change from standard to retroversion neck.

  • Fig. 2 CT shows the femoral stem anteversion, cup axial anteversion and sagittal anteversion. (A) CT shows the stem anteversion that is angle between stem neck and posterior femoral condylar axis. (B) The axial view shows the cup axial anteversion that is angle between cup face plane and transverse plane. (C) The sagittal view shows the cup sagittal anteversion that is angle between cup face plane and longitudinal plane.


Cited by  1 articles

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Jae Sik Yoon, Joon Sun Kang, Kyoung Ho Moon
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