Will Ear Cartilage Regrow in Ear After It is Used in Rhinoplasty?

 The cartilage that was removed won't regrow. You can use the other ear as well as the septum. For very large defects we use rib, but that is only if there is no other supply.

Ear cartilage -- or any other type of cartialge -- does not regrow in its original site once it has been removed.
In most rhinoplasty surgeries, the surgeon uses cartilage from the septum to straighten, strengthen, or reshape the nasal framework. If the cartilage from the septum is removed or damaged during a septoplasty, there may not be adequate quantities available for the rhinoplasty. If there is not sufficient cartilage in your nose for a rhinoplasty, grafts must obtained from another site - either the ear or the rib.

As you have read by the other physician comments, cartilage does not regrow after it has been harvested from the ear. The bowl of the ear is usually where we harvest cartilage, and there is generally no ear deformity results after harvest. We can obtain a great deal of cartilage from the bowls of both ears. Therefore, I would be very surprised if there was no available cartilage in your ears to use for secondary rhinoplasty. However, if your surgeon feels there is no cartilage available from your septum or ears, you may need to have cartilage harvested from your rib.

Ear cartilage does not grow back once harvested.  Cartilage is generally taken from the bowl of the ear, so that it does not result in a significant aesthetic deformity.  If a secondary procedure is required, the other ear, the nasal septum, and ribs are the only other options for cartilage grafts.

Ear cartilage grafts are usually taken from the concha (bowl) of the ear which does not  usually lead to any significant change in the appearance of your ear. Once it's removed, it does not grow back.