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Related Concept Videos

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...

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25-year follow-up of 102 unrevised cementless total hip arthroplasties with a second-generation metal-on-metal bearing in a young patient cohort.

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Related Experiment Video

Updated: Jun 26, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

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A high offset stem design does not increase stem migration under full weight bearing in cementless total hip

Tobias Reiner1, Robert Sonntag2, Jan Philippe Kretzer2

  • 1Department of Orthopaedics, Heidelberg University Hospital, Schlierbacher Landstraße 200a, Heidelberg, 69118, Germany.

Arthroplasty (London, England)
|February 3, 2025
PubMed
Summary

High-offset stems in cementless total hip arthroplasty (THA) show similar stability to standard stems, with no increased risk of loosening. The high-offset option is a safe alternative for patients needing increased femoral offset.

Keywords:
Cementless THA; Femoral offset; Radiostereometric analysis; RSAMigration

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Cementless primary total hip arthroplasty (THA) using high-offset stems may be linked to early aseptic femoral loosening.
  • Evaluating the stability of high-offset femoral components is crucial for patient outcomes.

Purpose of the Study:

  • To compare the primary and secondary stability of cementless high-offset femoral stems versus standard-offset stems in THA.
  • To assess the impact of stem offset on femoral component migration under full weight-bearing conditions.

Main Methods:

  • Prospective, observational, single-center study involving 42 patients undergoing cementless primary THA.
  • Radiostereometric analysis (RSA) used to monitor stem migration over 24 months.
  • Clinical outcomes assessed using modified Harris Hip Score (HHS) and WOMAC.

Main Results:

  • No significant differences in stem subsidence or migration between high-offset and standard-offset stems were observed.
  • Both stem types demonstrated initial subsidence followed by high secondary stability.
  • The high-offset group showed a significant difference in stem anteversion at 6 months and 2 years, and improved WOMAC scores at 2 years.

Conclusions:

  • Cementless high-offset and standard-offset stems exhibit comparable migration patterns and stability in THA within the first two years.
  • The SL-PLUS Lateral high-offset stem is a safe and viable alternative for patients requiring increased femoral offset in cementless THA.