There are a number of ear issues that can result from a concussion. The stapes bone can become dislodged or even broken. There are some tests that can be done. One uses puffs of air into the ear. I'm not up on the ear issues. There are others who have had extensive ear testing.

Tinnitus can be a nerve issue rather than an inner ear issue. I have had tinnitus for 15 years.

I don't think the inner ear can cause non-ear PCS symptoms.