-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 of spinal accessory nerve injury. A spinal accessory nerve injury can be caused by trauma or damage during surgery, such as a lymph node biopsy or jugular vein cannulation. Symptoms of spinal accessory nerve injury. Shoulder pain. Scapular winging. Weakness or atrophy of the trapezius muscle.