Deviated pelvis

Introduction Obliquely contracted pelvis: an ankle joint that is caused by one side of the flap and hip dysplasia, and a lower pelvis that causes a lower sloping diameter on the pelvis. It is a deformed pelvis that has lost its normal shape of the pelvis. Due to abnormal position in the uterus, the hip joint has been in the outreach position, the gluteus medius and the lateral part of the joint capsule are contracted, the gluteus maximus and the external rotator muscles have different degrees of contracture, acetabular development and ossification delay, contralateral hip Joints often have a subluxation.

Cause

(1) Causes of the disease

Due to the abnormal position of the fetus in the uterus, the hip abductor muscle contracture.

(two) pathogenesis

Due to abnormal position in the uterus, the hip joint has been in the outreach position, the gluteus medius and the lateral part of the joint capsule are contracted, the gluteus maximus and the external rotator muscles have different degrees of contracture, acetabular development and ossification delay, contralateral hip Joints often have a subluxation.

an examination

Related inspection

Blood routine CT examination

The hip anterior radiograph was taken at a 45° abduction, and the ossification delay of the acetabular apex was observed. This was due to the hip abduction deformity after the hip abduction, and the femoral head on the adductor side had a central pressure on the acetabulum. less. Sometimes the subluxation may occur on the adduction side.

Differential diagnosis

It should be differentiated from various deformed pelvis:

1. Funnel pelvis: The diameter of the pelvic inlet plane is normal, but the middle pelvis and the exit plane are narrow. The sides of the pelvis are inclined inward like a funnel, so it is called a funnel-shaped pelvis. A clinical manifestation of a narrow pelvis with intersegmental interphalangeal diameter.

The pelvic diameter line is too short or abnormal in morphology, resulting in the pelvic cavity being smaller than the limit of the first exposed part of the fetus, which hinders the decline of the first exposed part of the fetus and affects the smooth progress of the labor process, which is called the narrow pelvis. A narrow pelvis can be too short or multiple short lines, or a narrow plane or multiple planes. When a radial line is narrow, it is necessary to observe the size of other radial lines in the same plane, and then comprehensively analyze the size and shape of the entire pelvis to make a correct judgment.

2. Flat pelvis: The anterior and posterior diameter of the pelvic entrance is shortened, and the transverse diameter is normal. It is mostly the result of childhood rickets. The characteristics of this type of pelvis are: the sloping forward, protruding into the pelvic inlet, shortening the anteroposterior diameter of the entrance plane, and moving the lower part of the tibia backward, so the diameter of the pelvic and outlet is normal, even slightly larger.

3. Flat pelvis: The flat pelvis refers to the narrow entrance plane of the pelvis, the anteroposterior diameter is shortened, and the shape is flat, hence the name.

The hip anterior radiograph was taken at a 45° abduction, and the ossification delay of the acetabular apex was observed. This was due to the hip abduction deformity after the hip abduction, and the femoral head on the adductor side had a central pressure on the acetabulum. less. Sometimes the subluxation may occur on the adduction side.

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