Magnetic mini-mover procedure for pectus excavatum III: safety and efficacy in a Food and Drug Administration-sponsored clinical trial

J Pediatr Surg. 2012 Jan;47(1):154-9. doi: 10.1016/j.jpedsurg.2011.10.039.


Purpose: The magnetic mini-mover procedure (3MP) uses magnetic force to gradually remodel pectus excavatum deformity. A magnet is implanted on the sternum and coupled with an external magnetic brace. Under Investigational Device Exemption and Institutional Review Board approval, we performed a pilot study of safety, probable efficacy, and cost-effectiveness of this new treatment of an orphan disease using an implantable pediatric device.

Methods: Ten otherwise healthy patients, ages 8 to 14 years, with severe pectus excavatum (pectus severity index [PSI] > 3.5) underwent 3MP treatment (mean, 18.8 ± 2.5 months). Safety was assessed by postimplant and postexplant electrocardiograms and monthly chest x-rays. Efficacy was assessed by change in pectus severity index as measured using pretreatment and posttreatment computed tomographic scan. Cost of 3MP was compared with that of standard procedures.

Results: The 3MP device had no detectable ill effect. Device weld failure or malpositioning required revision in 5 patients. Average wear time was 16 h/d. Pectus severity index improved in patients in the early or mid puberty but not in patients with noncompliant chest walls. Average cost for 3MP was $46,859, compared with $81,206 and $81,022 for Nuss and Ravitch, respectively.

Conclusion: The 3MP is a safe, cost-effective, outpatient alternative treatment for pectus excavatum that achieves good results for patients in early and midpuberty stages.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adolescent
  • Child
  • Female
  • Funnel Chest / classification
  • Funnel Chest / surgery*
  • Humans
  • Magnets* / adverse effects
  • Male
  • Minimally Invasive Surgical Procedures / adverse effects
  • Minimally Invasive Surgical Procedures / methods*
  • Pilot Projects
  • Prostheses and Implants*
  • United States
  • United States Food and Drug Administration