OSIA System Bilateral Implantation Efficacy Evaluation in Children With Ear Aplasia

Inclusion Criteria: * To be aged between 7 and 17 years old at the time of enrolment * Use spoken French as primary mode of communication * Diagnostic of moderate to severe bilateral high grade microtia and/or ear atresia resulting in conductive hearing loss with an ACPTA between 60 and 80 dB and a BCPTA between 0 and 20 dB * Fitted with a unilateral or bilateral headband/headband/adhesive bone conduction device for more than 12 months. * In case of microtia: after or before ear reconstruction planned using the conventional costal cartilage graft procedure; anatomical conditions allowing implantation of the OSIA outside the area of a future ear reconstruction. * To be a medical and audiological candidate for the OSIA system * To be affiliated with a health insurance plan or be eligible for it * Signed consent from the legal guardian(s) Exclusion Criteria: * Weight less than 7 kg (CE marking limit) * Diagnosed with a severe neurological condition, identified by an MRI and/or a neuropediatric assessment * Diagnosed with a severe cognitive impairment, child psychiatric impairment, or developmental delay * Diagnosed with a severe cochleovestibular or cochlear nerve malformation * Live in a social context that does not allow for long-term follow-up * To be part of a family that does not understand spoken French * Already equipped with one (or two) bone conduction implant(s) * Affiliated with minimum state healthcare (AME) * To currently be pregnant or breastfeeding