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Spine J. 2016 Apr;16(4 Suppl):S34-9. doi: 10.1016/j.spinee.2015.12.098. Epub 2016 Feb 1.

Magnetic controlled growing rods for early-onset scoliosis: a 4-year follow-up.

Author information

1
Welsh Centre for Spinal Surgery & Trauma, University Hospital of Wales, Heath Park, Cardiff CF10 2FF, United Kingdom. Electronic address: karhao@gmail.com.
2
Welsh Centre for Spinal Surgery & Trauma, University Hospital of Wales, Heath Park, Cardiff CF10 2FF, United Kingdom.

Abstract

BACKGROUND CONTEXT:

There have been no studies with medium-term follow-up of magnetic controlled growing rods (MCGRs).

PURPOSE:

This study aimed to report our single center experience of a magnetic growing rod system with an average of 4 years' follow-up.

STUDY DESIGN/SETTING:

A retrospective case series was carried out.

PATIENT SAMPLE:

The sample comprised patients with early-onset scoliosis treated with magnetic controlled growth rods who were operated in 2011.

OUTCOME MEASURES:

Cobb angle, spinal growth rate, complications, and revision were the outcome measures.

METHODS:

Clinical case notes and radiographs were reviewed.

RESULTS:

There were 8 patients (5 dual-rod construct, 3 single-rod construct) who had a minimum of 44 months' follow-up and average of 48 months (44-55 months). Mean age at surgery was 8.2 years (range 3-10). Mean preoperative Cobb angle was 60° (34-94), whereas mean postoperative Cobb angle was 42° (32-63). The average number of extensions was 13.8 (range: 12-20). There were 6 patients (75%) who required 8 revision surgeries: rod problems (N=4), proximal screw pull-out (N=3), and development of proximal junction kyphosis (N=1). All three patients who had single-rod construct underwent revision procedure. Currently, four patients (50%) still have the magnetic rods in situ. The mean duration of MCGR in the patient in the removed group was 39 months (range: 34-46).

CONCLUSIONS:

Medium-term results of MCGR are not as promising as previously reported early results. Hence, MCGRs should be used with caution. Single-rod constructs should definitely be avoided. The role of MCGRs in revision cases still remains unknown.

KEYWORDS:

Early-onset scoliosis; MAGnetic Expansion Control system; Magnetic controlled growing rods; Medium-term follow-up; Revision; Survivorship

PMID:
26844638
DOI:
10.1016/j.spinee.2015.12.098
[Indexed for MEDLINE]

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