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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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Related Experiment Video

Updated: May 9, 2026

The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report
07:45

The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report

Published on: August 4, 2022

Do jumbo cups cause hip center elevation in revision THA? A computer simulation.

Chima Nwankwo1, Nick N Dong, Christopher D Heffernan

  • 1Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, CA, USA.

Clinical Orthopaedics and Related Research
|July 26, 2013
PubMed
Summary

Using large jumbo cups in hip revision surgery can elevate the hip center and cause bone loss. This may necessitate longer femoral heads to compensate for the altered hip biomechanics.

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Published on: February 27, 2018

Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Medical Imaging Analysis

Background:

  • Acetabular revision total hip arthroplasty (THA) using large (jumbo) cups effectively treats bone defects.
  • Oversized jumbo cups can lead to elevated hip center and anterior acetabular wall protrusion.

Purpose of the Study:

  • To computer-simulate hip center elevation and anterior wall protrusion with jumbo cup THA.
  • To assess the impact of jumbo cup placement at the inferior acetabular rim on hip center and bone removal.

Main Methods:

  • Analysis of 265 pelvic CT scans using custom software.
  • Computer simulation of oversized reaming to measure cup placement.
  • Quantification of vertical and anterior cup center shifts and anterior column bone removal.

Main Results:

  • Each 1-mm increase in reamer diameter shifted the hip center 0.27 mm superiorly and 0.02 mm anteriorly.
  • Anterior column bone removal increased by 0.86 mm per 1-mm increase in reamer diameter.
  • A hypothetical 54-mm to 72-mm socket increase predicted ~5 mm hip center elevation and ~15 mm anterior bone loss.

Conclusions:

  • Jumbo cup technique elevates hip center even with inferior rim placement.
  • Significant hip center elevation and anterior bone loss can occur with large jumbo cups.
  • Increased femoral head length may be required to counteract hip center elevation in revision THA with jumbo cups.