4. The evaluation of permanent impairments to functional or esthetic units must allow for the determination as warranted of functional limitations, functional restrictions, and esthetic changes affecting the victim as well as the importance of these impairments in relation to the situations described in the categories of severity provided in Schedule I. Deterioration that may occur in the long term must not be taken into consideration. In the event of such deterioration, a new evaluation will determine any increase in impairment.
The evaluation of permanent impairments must be performed in accordance with the guidelines provided in Schedule I and the result must be explainable by accepted medical knowledge supported by the objective findings found on clinical examination.