Asymmetry of the inner side of the thigh leg line, the frog test method is mainly a clinical examination method to determine whether the patient has congenital hip dislocation. However, from another perspective, it cannot be concluded that there is congenital hip dislocation just because the test is positive. It should be further confirmed by hospital B-ultrasound or X-ray examination. The key examination method is that the patient lies flat, the lower limbs are bent at the patella and placed on the same plane and straight line. The key positive reaction is that the two patella heights are different, and there are asymmetrical leg line manifestations on the inner side of the thigh. In some cases of congenital hip dislocation, there may be a significant sound of entry into the acetabulum when the patella is placed, or there may be significant resistance when performing this posture.

The frog test is used to examine the structure and function of the baby’s hip joint. Specific methods: the examiner lies on his back, the operator supports the knees with one hand, flexes the hips and knees to 90 degrees, and then performs external abduction and external rotation of both hips to form a frog-like position. If the upper part of the thigh cannot reach the bed surface, it is positive, indicating congenital hip dislocation.

Leg line error is also a main manifestation of congenital hip dislocation, with a high possibility of unilateral dislocation. Congenital hip dislocation, also known as developmental hip dysplasia (DDH), or hip dysplasia, is a congenital growth and development disorder of the hip joint, and delayed treatment may affect the growth and development of the patient. Physical health screening after birth is of great significance, and the basic diagnosis of developmental hip dysplasia can be made according to the leg line condition and frog test, so as to facilitate early treatment.

The main physical examination method for patients with congenital hip dislocation. Patients with congenital hip dislocation have poor matching between the ossification center of the femoral head and the acetabulum, and are not located at the acetabular ossification center, so the main manifestations are uneven length of the lower limbs, limited external rotation of the hip joint of the affected limb, weak energy of the lower limb push-off, and other main manifestations. Therefore, the clinical symptoms are unilateral leg line asymmetry, limited external rotation of the hip joint of the affected limb, and when performing the frog test, there is a feeling of hip joint popping in and out, which can basically be identified as congenital hip dislocation.