Table 1. A Grading System for Split Peroneus Brevis Tendon

Grade of Split	Description	Magnetic Resonance Imaging Findings	Treatment
I	Splayed-out tendon	The peroneus brevis tendon is flattened between the peroneus longus tendon and lateral malleolus.	Conservative treatment
II	Partial-thickness split	The tendon is flattened and also shows central thinning and some degeneration of tendon structure.	Conservative treatment
III	Full-thickness split	The tendon had a central “fenestration” and appeared to be separated into 2 fragments on a variable of section.	Surgical evaluation and repair
IV	Split extending >2 cm	The tendon had a central “fenestration” and appeared to be separated into 2 fragments on a variable of section.	Surgical evaluation and repair