-osis. 1  1 suffix meaning a (specified) action, process, or result: homeosis, narcosis, zygosis. 2  2 suffix meaning increase in a pathological condition: calcicosis, psittacosis, varicosis. -osis. , pl. Combining form meaning a process, condition, or state, usually abnormal or diseased; production of an abnormal substance, increase of a normal substance, or parasitic infestation.
If non-surgical treatment fails to relieve the symptoms of accessory navicular syndrome, surgery may be appropriate. Surgery may involve removing the accessory bone, reshaping the area, and repairing the posterior tibial tendon to improve its function. This extra bone is not needed for normal foot function.
Two of the most common accessory bones are the accessory navicular and the os peroneum. Their painful presence must be considered in the differential diagnosis of any acute or chronic foot pain.wo of the most common accessory bones are the accessory navicular and the os peroneum. Their painful presence must be considered in the differential diagnosis of any acute or chronic foot pain.