The os calcis secundarius is a rare accessory ossicle located on the superior-anterior surface of the calcaneus near the talonavicular joint. It is present in less than 1 percent of the population and is usually an incidental radiographic finding. Occasionally it can produce sinus tarsi-type symptoms from compression within the tarsal sinus.
| Articulations |
|
|---|---|
| Landmarks |
|
| Ossification | Secondary ossification centre that fails to fuse, a congenital variant. |
The os calcis secundarius is almost always asymptomatic and requires no treatment. When symptomatic it produces lateral midfoot pain in the sinus tarsi region and may be mistaken for an avulsion fracture on radiograph. CT confirms the well-corticated margins of a normal ossicle versus the irregular margins of acute fracture.
This ossicle can be mistaken for a fracture of the anterior process of the calcaneus after an ankle sprain; smooth corticated margins favour the accessory bone.
This website uses cookies to enhance your experience. Some are essential for site functionality, while others help us analyze and improve your usage experience. Please review your options and make your choice.
If you are under 16 years old, please ensure that you have received consent from your parent or guardian for any non-essential cookies.
Your privacy is important to us. You can adjust your cookie settings at any time. For more information about how we use data, please read our privacy policy. You may change your preferences at any time by clicking on the settings button below.
Note that if you choose to disable some types of cookies, it may impact your experience of the site and the services we are able to offer.
Some required resources have been blocked, which can affect third-party services and may cause the site to not function properly.
This website uses cookies to enhance your browsing experience and ensure the site functions properly. By continuing to use this site, you acknowledge and accept our use of cookies.
