11The Child's Balance and Motor Development
In children, vestibular loss is not mainly about dizziness — children compensate well — but about gross-motor milestones, reading, safety and even device survival. Vestibular impairment is common in deaf children, worsened (especially otolith function) by implantation, and when bilateral and complete it delays sitting, standing and walking. Early identification lets rehabilitation start sooner.
FMilestones as a vestibular readout
In a neurologically intact child, failure to achieve head control, independent sitting and independent walking by ~3, ~8 and ~18 months suggests bilateral vestibular hypofunction In 592 children with bilateral profound hearing loss, vestibular impairment was present in 44.4% and complete bilateral loss in 5.7%, both raising the odds of delay across all four posturomotor milestones Children with severe-to-profound SNHL have vestibular loss in roughly 50% of cases.[2004][2013]
TWhat implantation adds
Post-op vestibular dysfunction affects up to about half of implanted children; in 153 children canal dysfunction was ~50% (35% bilateral areflexia, 21% mild-moderate) A pediatric meta-analysis found implantation significantly increased abnormal cVEMP (RR 2.20), oVEMP (RR 2.10) and caloric (RR 1.62) responses, while vHIT showed no significant pre-versus-post change Present cVEMP responses fell from ~69% pre-op to ~31% post-op, so over half of children show post-op otolith dysfunction.[2013][2015]
TConsequences beyond dizziness
Implanted children show a gross-motor dip between 6 and 18 months with recovery by 24 months; in one series children with absent otolith function did not walk by 18 months Children with vestibular hypofunction read significantly worse, linking bilateral loss and oscillopsia to educational outcomes Children with reduced vestibular function were 7.6 times more likely to have CI device failure, hypothesized via falls and head trauma.[2015][2006]
CCounseling and safety
Counsel families that the dominant focus on auditory rehabilitation can itself contribute to a temporary gross-motor lag, and that early identification of vestibular-weak children lets physical therapy start sooner Warn about water safety: children with absent otolith function may not sense the water surface, so never swim alone Children generally prefer rotary chair over caloric testing, and cVEMP is testable from soon after birth.[2002][2015]
What does the motor history most likely indicate?
After pediatric implantation, which test shows the largest deterioration, reflecting otolith vulnerability?
Children with reduced vestibular function were found to have what change in cochlear-implant device failure risk?