Iselin's disease is a traction apophysitis. In other word an inflammation of the growth plate located at the base of the 5th metatarsal. The location is where the peroneus brevis muscle and plantar fascia inserts ( see blue arrow in picture above).

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Iselin's disease is commonly occurs in children aged 10-14 years prior to complete ossification of the growth plate. Diagnosis involves pain on activity and pain on palpation of the base of the 5th metatarsal. The area can be red and swollen.

 

X-Rays can identify Iselin's disease from avulsion fractures or Jones fractures.

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As with other apophysitis it is associated with rapid growth and excessive tension or blows to the area.

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Management of Iselin's disease involves RICER principles. Rest being particularly important. Stretching of peroneal and calf muscles can help if tight.

Addressing foot biomechanics with advice on supportive runners and foot orthotics are helpful.

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A Jones fracture which also presents as 5th metatarsal pain. Typically has a history of acute injury and needs to be treated with non- weight bearing immobilisation and orthopaedic referral.

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Again appropriate assessment improves recovery time.

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References:

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Picture taken from Orthobullets,2022

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Porter and Schon (2008) Baxter's the foot and ankle in sport.