Table 1 Eckert and Davis Classification for peroneal tendon dislocation [10, 14]

Grade 1

The retinaculum is elevated from the lateral malleolus

Grade 2

The retinaculum is elevated from the lateral malleolus, and the cartilaginous ridge is held on the retinaculum, ruptured from the fibula

Grade 3

The retinaculum is elevated from the lateral malleolus, and the cartilaginous ridge and a cortical rim of bone is held on the retinaculum. A thin bony avulsion can be seen in grade 3 injuries on x-ray as the pathognomonic fleck sign