Quantifying the ‘law of diminishing returns’ in magnetically controlled growing rods

Abstract

The 'law of diminishing returns' is also seen after serial distraction using MCGR. Compared to previously published data for CGRS, there is a gradual linear decline rather than a rapid initial decline in lengthening. In older, heavier children a reduced distraction ratio in the concave rod of the MCGR device is noted over time. Cite this article: <i>Bone Joint J</i> 2017;99-B:1658-64.