Prepatellar emptiness

Introduction The sacral sensation is one of the clinical manifestations of acute patella dislocation. The clinical manifestations of acute patella dislocation may have a small number of patients with elastic flexion deformity, anterior temporal sensation, and the tibia that can be dislocated and dislocated outside the knee joint.

Cause

Causes of acute patella dislocation: mainly direct violence, occasionally caused by indirect violence.

Pathogenesis: violent effects, or structural abnormalities at the same time, can cause traumatic dislocation of the tibia. It should be pointed out that the size of the violence may be quite different, and most of the potential bone, fascia or muscle structure abnormalities, such as the femur Low level. Excessive external rotation of the humerus has a fibrous band on the outside of the tibia. The tibia of the medial femoral muscle is absent or weak, and the Q angle is increased. The strength of the quadriceps is poor and the joints are loose.

an examination

Related inspection

Bone and joint soft tissue CT examination of bone and joint MRI

First, physical examination

Taking a medical history gives us a first impression and revelation, and also guides us to a concept of the nature of the disease.

Second, laboratory inspection

Laboratory examinations must be summarized and analyzed based on objective data learned from medical history and physical examination, from which several diagnostic possibilities may be proposed, and further consideration should be given to those examinations to confirm the diagnosis. Such as: limb X-ray examination.

Differential diagnosis

Diagnosis of acute patella dislocation:

History

There is often a history of trauma or a history of habitual dislocation.

2. Clinical manifestations

Knee pain and tenderness and possible deformities during acute trauma.

3. Imaging examination

In the case of acute dislocation, there may be varying degrees of swelling on the knee X-ray film, and sometimes the displaced tibia is visible.

Differential diagnosis:

Deafness or dysplasia of the humerus: nail-patella syndrome or hereditary osteo-onychodysplasia is a hereditary disease characterized by It is dysplasia or loss of the tibia, dystrophy of the nail, elbow dysplasia, humeral horn and renal failure.

Patellar softening: Patellar softening is a degenerative change caused by cartilage damage of the tibia, including a series of symptoms caused by swelling, fragmentation, shedding and corrosion of cartilage. Finally, the same changes occur in the articular surface of the femur and the tibia, and the reactive hyperplasia of the patellofemoral joint is gradually formed, and osteoarthritis will be formed later. In this type of patient, some are women who like sports. The prevalence of patella softening is 36.2%, and the incidence of women aged 30-40 is as high as 50%.

Tibial strain: Tibial strain is a common sports injury in the knee. Because the knee joint often over-extension and extension, the abnormal range of internal and external valgus, the cartilage surface under the tibia and the corresponding surface of the femur, long-term collision and crushing injury.

Common in patellofemoral joint cartilage injury. Articular cartilage damage is very common in sports injuries, but it is difficult to diagnose, especially early diagnosis is almost impossible in routine examinations, so it is often ignored and not treated in time. However, no matter what kind of cartilage damage, it may eventually lead to degeneration and necrosis of chondrocytes and permanent damage, so it has attracted attention in recent years.

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