1 Interosseous angle: The reason why the hind foot is eight feet away is that when the angle between the head of his bone and the bone is greater than the normal angle, the dog will walk eight feet away, and when the angle between the bones is less than the normal angle, it will be within eight feet.
2. Angle between bone and articular fossa: The angle between bone and articular fossa is usually 90 degrees. When the angle is tilted backward or forward, it will go outside eight or inside eight.
3. Direction of the bone leaving the articular fossa: Because of dysplasia or traumatic dislocation of the hip joint, when the bone dislocates to the anterior side of the articular fossa, it will cause internal splayed walking. If it dislocates inside, it will go beyond 8.
4. The position of the painful foot: When one foot is painful and the other foot is not painful or slightly painful, the dog will put the painful foot outward and the other foot inward to balance the strength. At this time, walking will be similar to the shape of the external eight, and problems of hip joint, knee joint, tarsal joint, metatarsal joint or orthopedics may cause pain. He is not a real external surgeon, and the pain may improve after it disappears.
5. Congenital or pathological changes in joint morphology: Congenital deformities of joints or alignment changes between joints caused by ligament rupture can also cause inner eight or outer eight when walking, and some deformities have nothing to do with the lower joint and hip joint, and can also cause inner eight or outer eight.