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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...

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Related Experiment Video

Updated: May 25, 2026

Culturing and Measuring Fetal and Newborn Murine Long Bones
06:58

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Biomechanical comparison between 2 guided-growth constructs.

Andrea Stitgen1, Kathryn Garrels, Hiro Kobayashi

  • 1Department of Orthopaedics, University of Wisconsin, Madison, WI 53705, USA.

Journal of Pediatric Orthopedics
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Solid screws and the M-2 guided-growth device demonstrate superior strength in fatigue testing, potentially reducing device failure in heavier children with deformities.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Pediatric Surgery

Background:

  • Guided growth with plate and screw constructs effectively corrects pediatric angular deformities.
  • Increased patient weight, as seen in Blount disease, may contribute to device failure.
  • Comparing the fatigue strength of different guided-growth devices and screw types is crucial.

Purpose of the Study:

  • To compare the strength to failure between two similar guided-growth devices (Orthofix 8-plate [M-1] and Biomet Peanut plate [M-2]).
  • To evaluate the impact of solid versus cannulated screw types on device strength.
  • To assess device performance under simulated cyclical loading conditions relevant to pediatric weight-bearing.

Main Methods:

  • A bone model was created using polyurethane foam and high-density polyethylene.
  • A 10.0-mm defect was spanned by plate and screw constructs.
  • Fatigue testing was performed on an MTS Bionix machine simulating cyclical loading at 4 Hz, 5.0 mm micromotion, and -500 N compression.

Main Results:

  • All devices failed at the screw shaft; plates remained intact.
  • The M-2 device with solid stainless-steel screws exhibited the highest mean cycles to failure (22,614).
  • Solid screws were significantly stronger than cannulated screws for both M-1 (P=0.002) and M-2 (P=0.013) devices. The M-2 device with cannulated screws was stronger than the M-1 device with cannulated screws (P=0.036).

Conclusions:

  • The M-2 guided-growth system shows increased strength compared to the M-1 system.
  • Solid screws provide significantly greater strength than cannulated screws in these constructs.
  • Further clinical trials are needed to confirm if these strength differences translate to lower failure rates in heavier pediatric patients.