-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.
Causes. A navicular fracture can be caused by a fall, severe twist, or direct trauma to the navicular bone. It can also be caused by repeated stress to the foot, creating a stress fracture unrelated to acute trauma.actors that may increase your chance of a navicular fracture include: 1  Trauma. 2  High-impact sports, such as track and field, gymnastics, tennis, or basketball. 3  Being an adolescent. 4  In women, abnormal or absent menstrual cycles. 5  Military recruits. 6  Osteoporosis or other bone conditions.