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Stem Cell Therapy for Tissue Regeneration

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Updated: May 5, 2026

Use of Human Perivascular Stem Cells for Bone Regeneration

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Published on: May 25, 2012

Compliant Intramedullary Stems for Joint Reconstruction.

John A Mccullough¹, Brandon T Peterson², Alexander M Upfill-Brown²

¹Department of Mechanical and Aerospace EngineeringUniversity of California Los Angeles Los Angeles CA 90095 USA.

IEEE Journal of Translational Engineering in Health and Medicine

|March 15, 2024

Summary

This summary is machine-generated.

This study introduces a novel compliant intramedullary stem designed to prevent aseptic loosening in joint replacements. This innovation aims to significantly extend the lifespan of artificial joints by reducing stress and wear.

Keywords:

Orthopaedics aseptic loosening compliant mechanisms flexure intramedullary stems joint replacement

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

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Published on: February 27, 2018

Area of Science:

Biomedical Engineering
Materials Science
Orthopedic Surgery

Background:

Current joint replacements have limited longevity due to aseptic loosening, a primary failure mode in hip, knee, and ankle arthroplasty.
Aseptic loosening results from osteolysis caused by particulate wear or high shear stresses at the bone-implant interface due to over-constraint.

Purpose of the Study:

To demonstrate the feasibility of a compliant intramedullary stem designed to eliminate over-constraint and prevent particulate wear.
To develop a design methodology for patient- and joint-specific compliant stems.

Main Methods:

Developed computational models to understand the relationship between compliant mechanism geometry and implant performance under load.
Utilized a neural network to identify optimal geometries for a 100-year fatigue life.
Additively manufactured prototypes for three anatomic locations and performed benchtop testing on a robotic system.

Main Results:

Neural network predictions for stress and stiffness showed low error (2.69% and 4.08%) compared to finite element analysis.
Identified feasible design spaces for compliant stems across three anatomic locations.
Prototypes met design specifications, with simulated peak stresses below the fatigue limit.

Conclusions:

The study successfully demonstrated the feasibility of designing compliant intramedullary stems to address the root causes of aseptic loosening.
This approach is expected to enhance the longevity of joint reconstruction implants.