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Heterotopic Ossification Interfering With Lengthening of Magnetically Controlled Growing Rods: A Report of 2 Cases
Luis Torres-Gonzalez1, Tenner J Guillaume2, Daniel J Miller2,3
1Research Department, Gillette Children's, St. Paul, Minnesota.
Case:
Two pediatric patients with early-onset neuromuscular scoliosis developed heterotopic ossification (HO) on the telescoping hub of magnetically controlled growing rods (MCGR), preventing lengthening. Resection of the circumferential HO and placement of a polytetrafluorethylene (PTFE) liner around the rod restored MCGR lengthening capabilities for 1.3 to 1.5 years after revision surgery, with no HO recurrence.
Conclusion:
HO formation surrounding the telescoping portion of the MCGR is a possible cause for failure to lengthen. If found, resection and placement of a PTFE liner can restore MCGR lengthening.
Level Of Evidence:
Level IV.
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