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The buttocks can touch the raised femoral head

Introduction
Cause
Examine
Diagnosis

Introduction

Introduction The femoral head that can be touched up by the buttocks mainly shows that the buttocks are swollen and sometimes not obvious, and the femoral head is more likely to be dislocated. The direction of displacement of the femoral shaft fracture varies depending on the position at the time of injury and the direction of action of external violence.

Cause

Cause

The reason why the buttocks can touch the femoral head that moves up:

The disease is caused by external force and dislocation. Dislocation is divided into three types: anterior and posterior dislocation and central dislocation. Later dislocation is the most common.

1. Post dislocation: The posterior dislocation is due to the flexion and adduction of the hip joint, and the violence from the long axis of the femur can tear the ligament, and the femoral head breaks through the joint capsule and causes dislocation.

2. Center dislocation: If the hip joint is in flexion and mild internal fixation, the same external force can cause the posterior margin of the acetabulum to fracture and the femoral head to dislocate backward. If the hip joint is in the middle or mild outreach position, violence can cause acetabular fractures, and the femoral head is displaced along the fracture to the pelvic cavity, which is called central dislocation, which is rare.

3, the former dislocation: If the hip joint is in the outreach position, the femur large trochanter and the upper edge of the acetabulum collide, as this fulcrum continues to abduction, violence along the long axis of the femoral head impact, can occur before dislocation. The femoral head can stay in a closed or pubic iliac crest. For example, in the lower position, the legs are abducted, and the kiln hole collapses, and the anterior dislocation can also occur.

Examine

an examination

Related inspection

Bone and joint MRI examination of bone and joint soft tissue CT examination Kleemann bone mineral density determination

Check diagnosis of the femoral head that can be touched up by the buttocks:

1. There is a history of obvious trauma.

2. Suffering from hip swelling, pain, and limited mobility.

3. Suffering from hip flexion adduction, internal rotation deformity, or abduction external rotation deformity.

4. X-ray film: visible dislocation, or combined with acetabular fractures.

Diagnosis

Differential diagnosis

Differential diagnosis of the femoral head that can be touched up by the buttocks:

Hip dislocation is clinically divided into three types: posterior dislocation, anterior dislocation, and central dislocation. Central dislocation is mainly due to acetabular fractures due to pathological changes in the injury site, so it is often listed as a pelvic fracture. The distinction between anterior and posterior dislocation is based on the pre- and post-Nile's line of the femoral head. The subsequent dislocation is common, and the incidence is 10-20 times of the anterior dislocation.

Because the anatomical structure of the hip joint is stable, dislocation often requires strong external force. Therefore, when dislocation, multiple injuries are often combined with other parts, so it is easy to be missed and misdiagnosed. In particular, it occurs in some complicated injuries, such as multiple fractures of the extremities, craniocerebral injury, or ipsilateral femoral shaft fractures. However, there are few reports of missed diagnosis and misdiagnosis of simple hip dislocation. Clinically, it is often necessary to identify fractures of the femoral neck.