Introduction to osteochondrosis Osteochondrosis refers to the phenomenon that bone density increases in some parts of the bone during bone growth and development, and the ossification center is irregular, small and fragmented, or the cartilage collapses and the subchondral bone is peeled off. It is a non-inflammatory disease of articular cartilage and ossification of cartilage cartilage. The disease mainly occurs in dogs in the fast growing period (4-8 months old). There are several osteochondrosis diseases that are common in clinical practice: 1 Separate osteochondrosis: abnormal thickening and cracking of articular cartilage, and then separation from subchondral bone to form cartilage flap or free cartilage piece. Mainly found in the shoulder joint (the posterior edge of the arm bone), the elbow joint (the internal arm bone), the knee joint (the internal femoral condyle) and the ankle joint (the talar block). 2 The elbow is not closed: the elbow ossification center and the ulnar proximal end of the ulnar are not closed for a long time (the sacral growth plate cartilage is not ossified), which makes the elbow joint unstable and easily secondary to the osteoarthrosis of the elbow joint. 3 ulnar coronoid process: The ulnar coronoid process splits into several pieces without healing with the ulna, which is easy to induce osteoarthrosis. 4 ossification retardation of the growth plate: the secondary ossification center of the long bone, such as the ossification growth plate of the distal ossification center of the ulna, is delayed, causing dysplasia with the growth of the humerus, resulting in angular deformity of the ulnar ulna or subluxation of the elbow. basic knowledge The proportion of illness: 0.004%-0.008% Susceptible people: good for teenagers Mode of infection: non-infectious Complications: muscle atrophy


Cause of osteochondrosis

The cause of this disease is not clear. May be related to congenital factors and related to excessive growth.

The pathogenesis can be divided into three phases: 1 necrotic stage is the death of the diseased bone cells, disappears, the trabecular bone is atrophied and squeezed, causing the diseased bone to break.

2 The repair period is necrotic bone resorption, calcification of new bone-like tissue, new bone formation, and re-repair.

3 in the healing period, the lesions can be completely restored to normal, and the severed often residual bones and joints are deformed.


Osteochondrosis prevention

1. Pay attention to exercise and enhance physical fitness.

2. In the diet, pay attention to the mix of nutrition.


Osteochondral complications Complications muscle atrophy

Juvenile vertebral osteochondrosis often occurs in adolescents with rapid growth, and the main cause of most patients is hunchback deformity. Some of these patients may have back pain, and 50% complain of pain, mainly in the deformed or lower back. Increased after the event. It usually decreases with the end of growth. Only 25% of patients with typical symptoms after the maturity period. If the pain is located at the waist and the deformity is in the chest, the possibility of vertebral arch fracture should be considered.


Osteochondrosis symptoms Common symptoms Muscle atrophy Intermittent claudication Limb pain Increased bone density

A history of claudication, pain but no injury, often bilateral symmetry, slow progression, and significant changes in cartilage or osteochondral structure when symptoms appear. It is aggravated after exercise and aggravated after a long break. The elbow muscle is atrophied and there is no swelling in the affected part. The joint puncture fluid is normal or mixed with cartilage fragments. X-ray examination showed subchondral bone invasion, abnormal ossification of the sacral growth plate or long bone deformation.


Examination of osteochondrosis

Feasible bone density examination and X-ray examination.

Seen in the third phase of X-ray:

1 The soft tissue of the necrotic stage can be swollen, the bone density of the ischemic necrosis site is increased, the trabecular bone is squeezed, and the volume is compressed and flattened.

2 During the repair period, due to vascular tissue invasion and bone-like tissue formation, the diseased bone can be seen in segmented, fragmented or small cystic translucent areas.

3 The bone density and morphology of the disease at the healing stage gradually returned to normal, or the bone and joint deformity remained.


Diagnosis and diagnosis of osteochondrosis


Based on clinical performance and related examinations, it is not difficult to make a diagnosis.

Differential diagnosis

Should be differentiated from rickets.

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