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Updated: May 29, 2026
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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Components anteversion in primary cementless THA using straight stem and hemispherical cup: a prospective study in 91
1Orthopaedic and Radiological Departments, Oslo University Hospital, Rikshospitalet, 0027 Oslo, Norway. olav.reikeras@rikshospitalet.no
Orthopaedics & Traumatology, Surgery & Research : OTSR
|September 6, 2011
Summary
Intraoperative estimation of component anteversion in cementless total hip arthroplasty (THA) is often inadequate, with many cases falling outside the desired range. However, this did not lead to dislocations in the study group.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Implant Design
Background:
- The recommended anteversion range for total hip arthroplasty (THA) components is 10-30°.
- Intraoperative estimation of component version can be inaccurate.
Purpose of the Study:
- To prospectively evaluate the achieved component anteversion in primary cementless THA.
- To assess the accuracy of intraoperative estimation of femoral and acetabular anteversion.
Main Methods:
- Prospective study of 91 patients undergoing primary cementless THA with straight stems and hemispherical cups.
- Surgeons aimed for specific anteversion ranges (femoral 10-30°, acetabular 10-30°, combined 25-55°).
- Postoperative CT scans assessed component versions; intraoperative methods included an impactor-positioner and knee flexion for stem positioning.
Main Results:
- Femoral anteversion varied widely (mean 23.0±11.8°, range -17° to 60°).
- Acetabular anteversion also showed significant variability (mean 18.5±13.7°, range -28° to 46°).
- Only 60.4% of hips achieved the target combined anteversion range (25-55°), but no dislocations occurred within 2 years.
Conclusions:
- The operative technique resulted in inadequate intraoperative estimation of component anteversion in cementless THA.
- Despite variability, the achieved component versions did not lead to early dislocations in this cohort.
