Congenital knee dislocation

Introduction to congenital knee dislocation Congenital dislocation and subluxation of the knee is a serious knee overextension. There are more women in this disease, 2 to 8 times more than men. More than half of the cases were complicated by other congenital malformations. Most patients had no family genetic predisposition. Provenzano found 7 cases with positive family history in 200 cases of knee dislocation, and most of them were patients with Larsen syndrome, combined with hand, foot deformity and other large joint dislocations. . basic knowledge The proportion of illness: the incidence rate is about 0.004% - 0.009% Susceptible people: no specific population Mode of infection: non-infectious Complications: knee varus knee valgus

Congenital knee dislocation

(1) Causes of the disease

There are different opinions on the cause of this disease. Some think that it is degeneration of the quadriceps in the fetus or muscular dystrophy in the fetal period; some think that it is due to abnormal position of the knee joint.

(two) pathogenesis

Patients with congenital knee dislocation often have abnormal dysplasia of the extremities, accompanied by contracture of the joint capsule and quadriceps in front of the knee joint; dysplasia or absence of the tibia, fibrosis of the lateral femoral muscle, etc.; Lateral displacement, thickening of the iliac crest and lateral femoral muscle; the cruciate ligament of the knee is thin or absent.

Congenital knee dislocation 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.

Congenital knee dislocation complications Complications knee valgus valgus

Complicated limb dysplasia: mainly manifested as pain in the hip joint and knee joint, limited mobility, difficulty walking, and swaying gait. Shoulder joint activity is also limited. The bone ends are often large, and a small number of patients have joint flexion deformities or joint relaxation. The hand becomes shorter, the fingers become thicker, and the figure is short. Because the disease affects the long bones of the extremities more than the spine, it is characterized by a certain degree of short-legged dwarfs, in addition to knee varus, valgus, unequal length of both lower extremities and posterior kyphosis.

Congenital knee dislocation symptoms Common symptoms Articular deformity Knee joint weakness, weakness, knee injury, knee injury

The patient had knee extension, knee flexion was limited, the quadriceps muscle was contracted, the tendon bundle was tense, the humerus was moved to the lateral side of the knee joint, and the tibial plateau was in front of the femur, showing subluxation or total dislocation.

Examination of congenital knee dislocation

X-ray findings of congenital knee dislocation.

In the tibia and femur, the lateral malleolus is poorly developed, and the tibia is displaced to the lateral side of the femoral condyle; the lateral humerus can be seen to shift to the anterior and posterior aspect of the femur, and the patellofemoral joint loses its normal shape.

Diagnosis and diagnosis of congenital knee dislocation

Diagnosis can be based on clinical manifestations and X-ray findings.

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