Table 2:

Criteria for stratifying of nerve injuries on MRN and surgery based on Sunderland classification

Class	MRN	Surgical
I	Qualitative: Homogeneous increased T2 signal of nerve with no change in caliber	Intact with no internal or external fibrosis, normal mobility and neuroarchitecture (visualize fascicles and Fanconi bands)
	Quantitative: No changes
II	Qualitative: Homogeneous increased T2 signal of nerve and mild nerve thickening Perineural fibrosis	Intact with no internal fibrosis with external fibrosis, restricted mobility but neuroarchitecture intact (visualized fascicles and Fanconi bands once external scar removed)
	Quantitative: <50% larger than contralateral /normal nerve
III	Qualitative: Homogeneous increased T2 signal of nerve and moderate to marked nerve thickening Perineural fibrosis	Intact with both internal and external fibrosis, restricted mobility and disturbance of neuroarchitecture (abnormal fascicle patterns and/or Fanconi bands not visible)
	Quantitative: >50% larger than contralateral/normal nerve
IV	Qualitative: Heterogeneous increased T2 signal of nerve and focal enlargement in otherwise continuous nerve (neuroma in continuity) Perineural and intraneural fibrosis	Partial transected nerve, but some amount of distal nerve present with or without lateral neuroma
	Quantitative: Focal swelling with heterogeneous T2 signal or fascicular disruption
V	Qualitative: Discontinuous nerve with end-bulb neuroma	Completely transected nerve with or without amputation (end-bulb) neuroma
	Quantitative: Complete disruption with gap and end-bulb neuroma