Ko te mahi matua otuakoipereti o mua o te kopuKo te whakakaha ake i te u o te hiku i muri i te pokanga. Ina tangohia, ka honoa ranei te kopae intervertebral, ka kore e tau te vertebrae, ka puta he raru pea. Ko te pereti o mua (ACP) he rite ki te piriti e hono ana i te vertebrae, me te whakarite i to raatau tika me te whakatairanga i te whakaora. I te nuinga o te waa he mea hanga mai i nga taonga koiora penei i te titanium, te kowiri tira ranei hei whakarite kia pai te whakauru ki te tinana me te whakaiti i te tupono o te whakakore.