In an ideal situation, the navicular bone and the accessory bone will fuse together to form one bone. The problem that occurs is that sometimes the two bones do not fuse together and the patient is left with what is known as a fibrous union or basically a non solid union of bone to bone. This fibrous union is more like scar tissue and in theory can cause pain when excessive strain is placed upon it.
This can result from any of the following. Trauma, as in a foot or ankle sprain. Chronic irritation from shoes or other footwear rubbing against the extra bone. Excessive activity or overuse. Many people with accessory navicular syndrome also have flat feet (fallen arches). Having a flat foot puts more strain on the posterior tibial tendon, which can produce inflammation or irritation of the accessory navicular.
Symptoms of accessory navicular include. Bone lump on the inside of the foot. Redness and swelling. Pain.
It is important to examine the posterior tibial tendon and measure the extent of pain to this tendon proximal to the navicular bone. You can clinically determine the amount of posterior tibial tendon involvement by assessing the degree of swelling, pain on palpation and strength. To evaluate the patient?s strength, have the patient stand and balance on one foot along with rising up on his or her toes.
Non Surgical Treatment
Non-surgical treatments are enough to cure the symptoms caused by the accessory navicular. The treatment options include Immobilization, a cast or a walking boot is usually used to immobilize the foot so that the inflammation and pain are alleviated quickly due to the rest that the foot gets. Apply ice bags or wrap the ice in a towel and apply it on the aching region to alleviate inflammation. Orthotic devices that can be fit into the shoes are prescribe to keep the symptoms from resurfacing. Exercises Where are the femur tibia and fibula? helpful for strengthening the muscles, which would not only help alleviate inflammation but also keep the symptoms from appearing again. NSAIDs and steroids may be prescribed as per the need of the patient to ease the pain and inflammation.
The original procedure advocated by Kidner involved shelling out of the accessory navicular bone from within the insertional area of the posterior tibial tendon and rerouting this tendon under the navicular bone in hopes of restoring a normal pull of this tendon. When treating younger children, history has shown us that simply shelling out of the accessory navicular bone from within the tendon and remodeling the tuberosity of the navicular bone can give you satisfactory results.
In general, you want to reserve advancement of the posterior tibial tendon for adults or those who have a more significant flatfoot deformity. You may also use this approach after determining that quality custom orthotics are only resulting in a slight decrease of symptoms.
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