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Os Vesalianum – The Accessory Bone of Fifth Metatarsal

By Dr Arun Pal Singh

In this article
    • What is Os Vesalianum
    • Differentiating Features of Entities That Look Similar to Os Vesalianum
    • Trauma to Os Vesalianum
      • Related

Last Updated on July 30, 2019

What is Os Vesalianum

Os vesalianum pedis is an accessory bone of the foot located proximal to the fifth metatarsal and found within the peroneus brevis tendon. It is a rare occurrence. The reported incidence is between 0.1% and 0.4%.

This ossicle is without any symptoms generally but often can become painful.

It is often discovered incidentally when foot is x-rayed for some other condition.

It is important to know about its occurrence as it can be very well confused with fracture of base of the fifth metatarsal and Iselin disease.

Other things that the Os Vesalianum should be differentiated apart from the fifth metatarsal avulsion fracture and Iselin’s disease are

  • Ossifying apophysis of the fifth metatarsal base
  • Ununited apophysis of the fifth metatarsal base
  • Nonunion of a tuberosity fracture of the fifth metatarsal
  • Os peroneum.
Accessory bone Os Vesalianum of the foot Os Vesalianum of the foot

Differentiating Features of Entities That Look Similar to Os Vesalianum

Normal ossification center at the fifth metatarsal tuberosity

Normal ossification canter of fifth metatarsal tuberosity is parallel to the metatarsal shaft.

Os Vesalinum is oblique [see image]

Differentiating between fifth metatrsal base fracture and apophysis
Differentiating between fifth metatarsal base fracture and apophysis
Case courtesy of Dr Alexandra Stanislavsky. From the case rID: 10842

The ossification center appears at age 12 for boys and 10 for girls. The fusion to the metatarsal base usually occurs within the following 2-4 years

Avulsion fracture of the apophysis of the fifth metatarsal

This entity is transverse to the metatarsal shaft rather than oblique. There would be a history of ankle twisting.

Iselin’s Disease

It is traction apophysitis at the base of the fifth metatarsal bone. It is a rare entity. There is a history of pain on activity which is relieved by rest. There is no history of trauma.

Os vesalnium and Iselin disease
Os vesalnium and Iselin disease

Iselin disease is thought to be due to overuse injury repetitive pressure during athletic activities and the traction by the inserted muscle is thought to contribute to the pathophysiology.

Trauma to Os Vesalianum

Sometimes, os vesalianum may become symptomatic due to trauma.

It is treated by rest, limited weight bearing, and symptomatic treatment.

Some patients may require a short-leg cast application.

A painful Os Vesalanium which does not get better with conservative treatment can be excised.

While carrying the excision the peroneus brevis tendon insertion should be spared carefully.

Related

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Filed Under: Foot Ankle

About Dr Arun Pal Singh

Arun Pal Singh is an orthopedic and trauma surgeon, founder and chief editor of this website. He works in Kanwar Bone and Spine Clinic, Dasuya, Hoshiarpur, Punjab.

This website is an effort to educate and support people and medical personnel on orthopedic issues and musculoskeletal health.

You can follow him on Facebook, Linkedin and Twitter

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