congenital accessory navicular
Introduction
Introduction to the congenital scaphoid The congenital accessory scaphoid (congenital accessory navicularbone) has a pair of bones at the medial nodules of the scaphoid. It is a common scaphoid dysplasia, and both sides are symmetric at the same time. The scaphoid bone is a defect in the structure of the foot, which affects the stability of the foot. basic knowledge Sickness ratio: 0.0001% Susceptible people: no specific population Mode of infection: non-infectious Complications: bursitis
Cause
Congenital scaphoid cause
(1) Causes of the disease
Congenital dysplasia, the cause is unknown.
(two) pathogenesis
1. The direction of the posterior tibial muscle of this patient is different from that of ordinary people. The normal tendon tendon is the "lower" through the inner end of the scaphoid, ending at the 2nd and 3rd cuneiform bones and the 2nd and 3rd humerus. At the time, the tendon of the posterior tibial muscles travels on the "upper side" of the inner side of the scaphoid, and is relatively firmly stopped on the stern bone, thereby causing the posterior tibial muscle to lift the longitudinal arch and lose the function of the foot varus. Foot and cause the corresponding symptoms.
2. The scaphoid is easy to contact with the internal hemorrhoids, hindering the inversion of the foot, and the reverse contraction of the abductor muscle. The foot valgus and the longitudinal arch collapse over a long period of time.
3. The friction during walking causes local bursitis and tendon sheath inflammation.
Prevention
Congenital scaphoid prevention
There is no effective preventive measure for this disease. Early detection and early diagnosis are the key to the prevention and treatment of this disease.
Complication
Congenital scaphoid complications Complications bursitis
Localized bursitis can occur.
Symptom
Congenital scaphoid symptoms common symptoms
The scaphoid nodule (the stern bone) has bony prominence or fullness, tenderness, bursitis, positive resistance to resistance varus (increased pain in the medial foot), and the medial side of the foot after long walk and standing Pain can also be accompanied by pain in the soles of the feet. Some patients have no symptoms of discomfort. They are only found when taking X-ray films due to trauma or other reasons.
Examine
Congenital scaphoid examination
The X-ray film shows small bones with neat edges at the back of the scaphoid. The density is the same as that of the scaphoid. Some of them are irregular in the joint with the scaphoid, or have cystic changes, or the bones on both sides of the joint are hardened. The bone may have scattered dot shadows or increased bone density. Congenital scaphoid bones can be divided into two types:
1. Clearly defined with the scaphoid, round or irregular, small in size and free.
2. The accessory bone is large, and is connected with the scaphoid into a hook-shaped scaphoid. However, the ossification center of the scaphoid nodule is still outside the bone, and there is a cartilage connection.
Diagnosis
Diagnosis and diagnosis of congenital scaphoid
According to the medical history, clinical manifestations and X-ray examination, the diagnosis can be confirmed.
Attention should be paid to the differentiation of the scaphoid fracture: the congenital scaphoid deformity has no obvious history of trauma, and the X-ray film shows that the edge of the bone is neat.
