There are multiple definitions:

1. plan of corrective action(English)

   • Practical shorthand

2. posterior occipitocervical angle(English)

   • strategy of combination POCA and O-C 2 angle for adjustment of occipitocervical fixation angle during operation can ensure a better effectiveness
   • O-C 2, JOA
   • Surgery
   • https://doi.org…-1892.201807115