Iselin disease is the osteochondrosis or epiphyisitis of base of fifth metatarsal. It is also known as traction aophysitis or epiphysitis of fifth metatarsal base.

It was described by Iselin in 1912 as occurring in young adolescents at the time of appearance of the proximal epiphysis [growth plate] of the fifth metatarsal.

The affected epiphysis is a small, shell-shaped fleck of bone is located on the lateral plantar aspect of the tuberosity of fifth metarsal. It is not visible on anteroposterior or lateral radiographs and can be seen in the oblique view.

Peroneus brevis muscle insertion is in vicinity of this epiphysis.

The epiphysis appears in girls at about age 10 years and in boys at about age 12 years and is fused about 2 years later. [Read more...]