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Related Experiment Video

Updated: Jul 2, 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

Stemmed implants improve stability in augmented constrained condylar knees.

Jeremy J Rawlinson1, Robert F Closkey, Nicole Davis

  • 1Cornell University, Ithaca, NY, USA.

Clinical Orthopaedics and Related Research
|August 19, 2008
PubMed
Summary
This summary is machine-generated.

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Adding a tibial stem with a wedge implant significantly reduces bone stress and maintains implant stability. This suggests a stem is preferable when utilizing a wedge for tibial augmentation.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical device design

Background:

  • Constrained condylar implants are used in tibial augmentation.
  • Tibial stem augmentation aims to reduce bone strain and improve implant stability.
  • The use of wedges in tibial implants can alter load distribution.

Purpose of the Study:

  • To evaluate the biomechanical benefit of a tibial stem when used with a wedge implant.
  • To compare implant-bone motion and proximal tibial bone stress with and without a tibial stem in conjunction with a wedge.

Main Methods:

  • Eight paired cadaveric tibial specimens were used.
  • Oblique defects were created and restored with 15-degree metallic wedges.
  • Varus moment and axial load were applied, monitoring implant-bone motion.

Related Experiment Videos

Last Updated: Jul 2, 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

  • Specimen-specific 3-D finite element models were constructed to analyze bone stress.

    • Main Results:

    • Implants with a wedge but no stem exhibited greater motion than controls.
    • The addition of a modular stem with a wedge maintained implant-bone motion similar to the primary case.
    • Computational models showed a 30% reduction in bone stress with a stem and wedge, compared to 17% without a wedge.
    • The wedge carried increased axial load due to metaphyseal bone support.

    Conclusions:

    • A tibial stem is preferable when a wedge is utilized in constrained condylar implants.
    • The combination of a stem and wedge effectively reduces bone stress and maintains implant stability.
    • This integrated approach provides valuable insights into optimizing tibial implant designs.