These intervertebral discs can degenerate, calcify, or herniate due to trauma. There are two main types of IVDD. In Type I IVDD, the inner part of the intervertebral disc calcifies and herniates ...
That said, all these materials need regular upkeep as the harsh Australian weather can play havoc with anything left outside. Timber will dry out and split in no time; aluminium bubbles and calcifies ...