Histological Consequences of Needle-Nerve Contact following Nerve Stimulation in a Pig Model

Table 1

Nerve injury score. Slight nerve damage is represented by the score grades 1 and 2. A severe nerve injury with structural damage is described with score grades 3 and 4. For detailed description with histological examples, please refer to Steinfeldt and coworkers [6].

Score value	Definition
0	No signs of neural injury or inflammation
1	Areas with slight accumulation of inflammatory cells
2	Areas with distinctive signs of inflammation
3	Areas with distinctive signs of inflammation plus haematoma
4	Areas with distinctive signs of inflammation plus myelin damage