Table 1.

McGowan grading classification

McGowan grade	Clinical features
Grade 1	Minimal lesion Paraesthesia and subjective clumsiness No motor deficit
Grade 2	Intermediate lesion Paraesthesia and sensory loss Motor weakness ± some muscle wasting
Grade 3	Severe lesion Paraesthesia and sensory loss Severe motor deficit and muscle wasting

Source: Adapted from McGowan AJ, 1950.²⁹