5The Clearest Case: Single-Sided Deafness and Tinnitus

CWhy SSD is the cleanest evidence

In single-sided deafness, the deaf ear frequently generates severe, often incapacitating tinnitus that has resisted every other treatment, making it an ideal test of whether the implant suppresses tinnitus. Because the other ear hears normally, hearing improvement is not the only thing changing — tinnitus relief can be isolated and is often the primary or co-primary reason to implant. Meta-analysis of CI in SSD shows a large, statistically robust reduction in tinnitus severity (standardised mean difference around -1.3), among the strongest tinnitus signals in the implant literature. Long-term follow-up out to a decade shows the suppression is durable, not a short-lived novelty effect. (See Special Populations for the full SSD/AHL candidacy picture.)[2023][2016][2011]

CWhy the alternatives do not treat the tinnitus

CROS aids and bone-conduction devices reroute sound from the dead side to the good ear — they restore some awareness of sound on the bad side but do nothing for the tinnitus, because the dead ear is still deaf and still firing aberrantly. Only the cochlear implant re-stimulates the deafferented auditory pathway on the affected side, which is the route to genuine tinnitus suppression. In the French multicentre study and RCT, implantation outperformed CROS/BCD and abstention on quality of life and tinnitus, while CROS/BCD left tinnitus essentially untouched. This distinction reframes the choice: if tinnitus is the dominant complaint, rerouting devices are not a true alternative to the implant.[2021][2023][2011]

TFolding tinnitus into SSD candidacy and counselling

When a candidate's chief complaint is the tinnitus rather than the hearing handicap, tinnitus relief legitimately becomes a co-primary indication in SSD — a stronger evidence base than for bilateral candidates. Counsel that the SSD evidence for tinnitus is better than for bilateral implantation, but it remains a high-probability benefit, not an absolute guarantee, and a trial of CROS/BCD may be offered first per local guidelines. Set the expectation that effect is generally strongest with the device worn, and that consistent daily use supports the most durable suppression. Apply the same psychoacoustic and psychological screening as any tinnitus patient — a recipient with major distress and central/psychological drivers may benefit less.[2022][2016][2021]