What is Os Naviculare Syndrome?

An Os Naviculare is an accessory bone that is a common genetic variant. It is usually asymptomatic but can become inflamed causing Os Naviculare Syndrome. There are several different types of accessory bones and they are grouped according to their position, shape and relationship with the adjacent bone. The Os is closely related to the Tibialis Posterior tendon and the Navicular bone.

What are the symptoms of Os Naviculare Syndrome?

Patients will often present with a swelling on the medial side of the foot and complain of pain after periods of standing, walking or more significant exercise.

How is Os Naviculare Syndrome diagnosed?

Clinical examination is an important aspect of making the diagnosis but imaging modalities such as X-ray and MRI are helpful in also planning treatment.

How is Os Naviculare Syndrome treated?

Treatment will depend on the severity of the symptoms, the type of Os Naviculare and the site of inflammation. If symptoms are mild then patient education is often all that is needed. With more significant symptoms, various options are available. If an MRI suggests that there is inflammation between the os and the navicular then injection therapy is quite effective. Inflammation of an os sitting within the tib post tendon is more difficult to treat non-operatively but simple rest and orthotics can be helpful. If all non-operative measures fail, surgery to excise the os and repair the tendon has good outcomes.

If you or someone you know has suffered an injury or is experiencing pain across their lower limbs or difficulty with mobility and would like a consultant-led review, please contact us. Grosvenor Orthopaedics have extensive experience in the treatment of knee-related injuries with excellent patient outcomes.


Grosvenor Orthopaedics have extensive experience in the treatment of foot & ankle -related injuries with excellent patient outcomes.


If you would like to learn about other foot & ankle conditions click the button below to find out more


If you would like to learn about other foot & ankle treatments click the button below to find out more

our specialist FOOT & ANKLE consultants

Foot & ankle care at Grosvenor Orthopaedics is lead by Mr Tim Sinnett. A graduate of Cambridge and Imperial College medical schools and leading academic and trauma consultant for Chelsea and Westminster NHS trust. He is further supported by the orthopaedic team here including other consultant surgeons, nurses and care staff.

Our team are well placed to manage and treat a diverse range of foot and ankle concerns utilising cutting edge diagnostic technology and treatment approaches, both surgical and conservative. Below is an overview of some of the conditions we treat but for a more thorough understanding please contact our team here


Consultant Trauma and Orthopaedic Surgeon, Specialist in Foot and Ankle Surgery

MBBS (AICSM), MA (Cantab), FRCS (Tr & Orth)
Tim is a Trauma and Orthopaedic Consultant at Chelsea and Westminster NHS Foundation Trust, King Edward VIIs Hospital, and the Lister Hospital, Chelsea. His high volume Adult Foot and Ankle practice is made up of all aspects of ankle, hindfoot, midfoot and forefoot pathology. He is an avid believer in patient empowerment and autonomy, especially when decisions regarding surgery are required. Ensuring a high-quality patient journey from the first assessment to full rehabilitation is at the heart of his practice.

What some of our patients say

Mrs JS

Thank you to the whole team for getting me back on my feet again