os peroneum

1. Displacement > 4 mm

2. Angulation > 10^o

3. Intra-articular

Zone 1

- avulsion fractures

Tendonitis / Tendonopathy

Lateral compartment of leg

- run through retromalleolar groove

- pass superior and inferior to peroneal tubercle

- covered by inferior peroneal retinaculum

Peroneus longus

- origin lateral condyle of tibia and head fibula

- tendon PL superficial and inferior to brevis in retromalleolar groove

- runs in cuboid groove

- insert plantar surface base of 1st MT and lateral aspect medial cuneiform