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High Correlation Between Achieved and Expected Distraction Using Magnetically Controlled Growth Rods (MCGR) With Rib

Heiko M Lorenz1, Lena Braunschweig, Batoul Badwan

  • 1Department of Trauma, Orthopaedic and Plastic Surgery, University Medical Center Goettingen, Goettingen, Germany.

Journal of Pediatric Orthopedics
|November 20, 2018
PubMed

Insights

Magnetically controlled growing rods (MCGR) achieve 94.4% of expected spinal distraction in children with progressive deformities. Complications were low at 4.6%, linked to higher BMI, demonstrating MCGR therapy

Area of Science:

  • Pediatric Orthopedics
  • Spinal Surgery
  • Biomedical Engineering

Background:

  • Magnetically controlled implant systems are used for severe progressive spinal deformities in children.
  • These systems enable controlled lengthening of the spine during growth.

Purpose of the Study:

  • Evaluate the ratio of achieved to expected distraction length with magnetically controlled growing rods (MCGR).
  • Assess the complication rate and identify associated risk factors.
  • Determine the correlation between distraction length and overall spinal growth.

Main Methods:

  • Prospective study of 40 pediatric patients with an average 34-month follow-up.
  • Lengthening procedures performed every three months.
  • Distraction ratio calculated by comparing radiographic measurements to the external controller, with BMI and complications recorded.

Main Results:

  • Achieved distraction was 94.4% of the expected length across 746 procedures.
  • The overall complication rate was 4.6%, primarily implant failure or lack of extension, linked to increased BMI.
  • A strong correlation was found between achieved implant distraction and spinal length gain.

Conclusions:

  • Magnetically controlled growing rods demonstrate a high ratio (0.94) of achieved to expected distraction.
  • Low complication rates (4.6%) were observed, with higher BMI as a risk factor.
  • The correlation between distraction length and spinal growth confirms the efficacy of MCGR therapy.
Abstract

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