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Short Hip Stem Prostheses
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The Natural Hip Joint


The hip joint is made up of the hip socket (or acetabular cup) that is located in the pelvic bone and the femoral head, which can rotate and move in the socket in all directions. The femoral head is the upper part of the neck of the thigh bone, which transitions in turn to the thigh bone (femur).

In a healthy joint the socket and head are coated with a smooth layer of cartilage. The synovial fluid, which is located in the joint cavity and enveloped by the joint capsule is responsible for a smooth sequence of movements.

Muscle and soft tissue
Numerous, powerful muscle and tendon structures surround the natural joint. They are ultimately responsible for bending, rotating, stretching, adduction and abduction of the leg and stabilizing the bony environment. The complex interaction of the respective muscles puts the joint into motion and allows humans to walk confidently and erect.

The muscle and tendon structures transmit the forces that occur to the femoral head or the femoral neck.

Depending upon the sequence of steps one speaks of tensile or compressive stress that affects the thigh bone.

Approximately four times the body’s weight is borne by the hip joint with every step. And this is considerably higher with sports and shock-like movements.

Bone structure
Human bone is made up of 2 layers that differ significantly in terms of their composition. The outermost edge of the bone is surrounded by a very hard bony layer, the cortical bone. The inner portion of the bone is interfused with a softer, spongy, small-meshed networked structure.