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Updated: Jul 14, 2026

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

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

Published on: February 27, 2018

Evaluation of an expandable stem total hip replacement system.

Frederick J Kummer¹, Eric J Strauss, William L Jaffe

¹New York University School of Medicine, New York, NY 10003, USA.

Bulletin of the NYU Hospital for Joint Diseases

|June 22, 2007

Summary

Expandable femoral stems can be permanently fixed using acrylic cement instead of saline, offering a stable solution for hip replacements. This innovation avoids loosening and has broad applications in fracture management and revision surgery.

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Area of Science:

Orthopedic surgery
Biomaterials engineering
Medical device design

Background:

Expandable nails use saline for bone fixation, with recent development as femoral components in total hip replacement.
Current expandable nail technology relies on saline, posing risks of deflation and loosening.

Purpose of the Study:

Evaluate acrylic cement as a permanent expansion medium for expandable hip replacement stems.
Assess stem subsidence under cyclic loading.
Determine if stem expansion induces detrimental stresses in the femur.

Main Methods:

Tested expandable femoral stems using acrylic cement for expansion.
Performed cyclic loading tests on cadaveric femurs with cemented stems.
Measured stem subsidence and femoral hoop strains.

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

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

Published on: February 27, 2018

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

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Main Results:

Expandable femoral components can be successfully expanded with cement using controlled viscosity and a modified technique.
No significant stem subsidence or untoward hoop strains were observed in cadaveric femur tests.
Bench testing confirmed the stability of cement-expanded stems.

Conclusions:

Acrylic cement offers a viable, permanent expansion method for expandable femoral stems, enhancing construct stability.
This technique eliminates the risk of deflation and loosening associated with saline-filled implants.
Expandable femoral prostheses present a promising alternative for various orthopedic applications, including tumor surgery, hip fracture, and revision total hip replacement.