Limb inversion

Introduction Knee varus, commonly known as "O-legs", "Road legs", "Bow legs", " basket legs". It means that at the knee joint, the tibia of the calf is rotated inward by an angle, so it is called "knee varus". It is named after the flipping direction of the calf. Knee varus, the knee joint angle is pointing to the outside, so it is often mistaken for knee valgus. Walking outside the splayed feet, standing in a short position, wearing high heels, sitting, squatting, squatting, etc., will give the knee an outward force, and this force will pull the lateral collateral ligament of the knee. Will cause the knee collateral ligament to relax.

Cause

Calcium deficiency and heredity are the two foundations of knee varus formation, but the more direct reasons are still walking, standing, sitting and some sports. The medial and lateral collateral ligaments of the knee joint are stable structures of the medial and lateral angles of the knee joint. When the lateral collateral ligament is slack, the excessive force of the medial collateral ligament will pull the calf tibia to the inside to form a knee varus.

an examination

Related inspection

CT examination of bones, joints and soft tissues for the limbs and joints of the extremities

In the double heel, the two feet together, relax the legs upright, such as the distance between the knees, it means there is knee varus.

Generally, the severity of knee varus is determined according to two indexes of normal knee distance and active knee distance.

The so-called normal knee distance refers to the distance inside the knee joint when the two legs are close together and the legs and knees are relaxed.

The active knee distance refers to the distance between the two legs and the knees and the knee joints in the upright position, and the distance inside the knee joints.

According to the normal knee distance and the active knee distance, "knee varus" is divided into I degree, II degree, III degree and IV degree.

1. The normal knee distance is below 3 cm, and the active knee distance is 0.

2. The normal knee distance is below 3 cm, and the active knee distance is greater than 0, which is II degree.

4, the normal knee distance is greater than 5 cm is the IV degree.

Differential diagnosis

People with knee varus, when standing and walking, are usually forced by the lateral muscles of the legs, and the inner side is not used. Therefore, the muscles of the legs are unevenly developed, and there are often more lateral muscles and less inner muscles. In this way, the formed leg muscle contour is curved, giving the impression that the bone is bent. Also, since there are few muscles inside the leg, the gap between the legs is not large. There are many lateral muscles, it is wide, the lower limbs are swollen, the legs are short, and the upper and lower sides are not coordinated.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.