Hip

Your hip is a strong joint.

It connects your legs to your body. It works like a ball and a cup. The top of your leg bone is round like a ball. It fits into a cup in your pelvis.

This joint helps you stand up tall. It also helps you walk and run. It helps you stay balanced.

Three bones join to make your hip. These bones grow together as you get older.

Strong bands called ligaments hold the bones tight. One band is very strong. It helps you stay upright without using muscles.

Your hip needs blood to stay healthy. Small tubes carry blood to the bone. This keeps your hip working well.

Your hip is a very strong joint. It connects your legs to your main body.

This is a ball and socket joint. The top of your thigh bone, called the femur, has a round head. This head fits into a cup in your pelvis. We call this cup the acetabulum. A ring of tissue called the labrum helps hold the ball in the cup.

The hip joint has a big job. It supports your weight when you stand still. It also helps when you walk or run. It helps you keep your balance.

Three pelvic bones join to make the hip area. These are the ilium, ischium, and pubis. In adults, these bones have fused into one.

Strong bands called ligaments hold the bones together. One ligament, the iliofemoral ligament, is the strongest in your whole body. It helps you stand upright without using your muscles. Small tubes carry blood to the bone to keep it healthy. This blood comes from parts of the deep artery of the thigh.

The hip is a very important part of the human body. It is a joint that connects your legs to your main trunk. This joint helps you support your weight when you stand still. It also helps you stay balanced when you walk or run.

The hip is located on the outer side of your pelvis. It sits below the top edge of your hip bone. This area is also near your large leg muscles.

The hip works as a ball and socket joint. This means a round ball fits into a cup-shaped hole. The ball is the head of your femur, which is your thigh bone. The cup is called the acetabulum. This socket is part of your pelvis.

A ring of tissue called the labrum helps hold the ball in place. Both the ball and the socket are covered in a smooth layer. This layer is called articular hyaline cartilage. It helps the bones move smoothly against each other.

Learning about the hip has a long history. In the past, people used different names for it. A person named Celsus used the Latin word coxa to mean hip. Later, a writer named Pliny the Elder used it to mean the hip bone. Today, doctors use specific terms for the hip. They might call it the acetabulofemoral joint. This name describes the connection between the pelvis and the femur.

There are many specific facts about how the hip is built. In adults, three bones called the ilium, ischium, and pubis fuse into one. Children have a Y-shaped growth plate called the triradiate cartilage. This cartilage fuses shut between the ages of 14 and 16.

The femoral head has an average radius of 2.5 cm. One very strong band in your body is the iliofemoral ligament. It can hold a weight of 350 kg. This ligament helps you stand upright without using your muscles.

You can think of the hip like a heavy-duty machine. It must be strong enough to carry your whole body. It also needs to be flexible enough to let you move. The hip joint has a very large range of movement. It is the second largest range in the human body. Only the shoulder joint can move more than the hip. This allows you to move your legs in many different directions.

The hip is a vital anatomical region and joint in the vertebrate body. It serves as the primary connection between the lower limbs and the axial skeleton of the trunk. In medical terminology, the hip refers to an anatomical region or a joint on the lateral side of the pelvis. The hip joint is scientifically known as the acetabulofemoral joint or the coxofemoral joint. Its primary function is to support the weight of the torso during both static and dynamic postures. This means it holds you up while standing still and manages forces while walking or running. It also plays a critical role in maintaining balance and pelvic inclination angles.

The mechanics of the hip rely on a ball-and-socket synovial joint structure. This joint is formed by the articulation of the rounded femoral head and the cup-like acetabulum of the pelvis. The femoral head is the top portion of the femur, which is the thigh bone. The acetabulum is a socket that faces downwards and anterolaterally. To ensure smooth movement, both joint surfaces are covered with articular hyaline cartilage. This is a strong, lubricated layer of tissue. The acetabulum itself is formed at the union of three pelvic bones: the ilium, the ischium, and the pubis. In adults, these three bones have fused into a single hip bone.

Several specific structures deepen the stability of this joint. The acetabulum grasps almost half of the femoral ball. This grip is strengthened by the acetabular labrum, which is a horse-shoe shaped ring of fibrocartilage. The labrum extends the joint beyond its equator to hold the bone in place. The femoral head has an average radius of curvature of 2.5 cm. Inside the acetabulum, the center is called the fovea. The fovea does not articulate with anything; instead, it is lined with a fat pad and attached to the ligamentum teres. This intracapsular ligament can be a vital conduit for a small artery supplying the femoral head.

The hip is reinforced by a strong fibrous capsule and four key ligaments. The capsule has two sets of fibers: longitudinal and circular. The circular fibers form a collar around the narrowest part of the femoral neck called the zona orbicularis. This acts like a buttonhole to help maintain joint contact. Three of the ligaments are extracapsular: the iliofemoral, ischiofemoral, and pubofemoral ligaments. The iliofemoral ligament is the strongest ligament in the human body, with a tensile strength of 350 kg. It is a Y-shaped, twisted structure that prevents the trunk from falling backward when standing. This allows you to remain upright without constant muscular activity.

Specific angles define the health and shape of the hip. The acetabular angle, or Sharp's angle, changes significantly during growth. It measures 35 degrees at birth but drops to less than 10 degrees by age 15. In adults, this angle typically ranges from 33 to 38 degrees. Another measurement is the caput-collum-diaphyseal angle, or CCD angle. This is the angle between the axes of the femoral neck and the shaft. In newborns, this angle is approximately 150 degrees, but it decreases to about 126 degrees in adults. If this angle is too small, it is called coxa vara; if it is too large, it is called coxa valga.

Changes in these angles can affect the rest of the body. For example, coxa valga is often associated with genu varum, or bow-leggedness. Conversely, coxa vara can lead to genu valgum, which is known as knock-knees. These changes occur because the shape of the femur affects the alignment of the knee. Such shifts in shape also change the stress patterns applied to the bone. These stress patterns influence the trabecular patterns, which are the internal structures of the bone. Dislocation or other injuries can cause these internal patterns to shift as well.

Blood supply is essential for maintaining the health of the hip joint. The joint receives blood from the medial and lateral circumflex femoral arteries. These are usually branches of the profunda femoris, the deep artery of the thigh. There are also important connections called anastomoses, such as the cruciate and trochanteric anastomoses. The trochanteric anastomosis provides most of the blood to the femoral head. Maintaining this blood supply is vital to avoid avascular necrosis, a condition where bone tissue dies due to lack of blood. This is especially important if the neck of the femur is fractured.