Table 2: Grading scale of stress fractures based on MRI findings. Allows for analysis of severity and appropriate treatment options.

Grade Frederickson Description Type Treatment
1 (Low) Mild to moderate periosteal edema on T2; normal marrow on T2 and T1 Compression Generally non-surgical unless > 50%
2 (Low) Moderate to severe periosteal edema on T2; marrow edema on T2 but not T1 Tensile Generally surgical, individually based decision
3 (High) Moderate to severe periosteal edema on T2; marrow edema on T2 and T1 Displaced Surgical emergency for reduction and fixation
4 (High) Moderate to severe periosteal edema on T2; marrow edema on T2 and T1 with fracture line Atypical tensile Non-Surgical