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Short Hip Stem Prostheses
 
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Hip Motions

Because of its outward round appearance, the hip joint can be moved in a whole range of directions in interaction with the musculature.

The following illustrations will provide you with an overview of possible movements and give you an idea what additional forces and load changes can occur.

Bending and stretching
When the joint is moved, e.g. when climbing stairs, it is alternatively subject to stretching (extension) and bending (flexion). In the process, the femoral head is mainly rotated in the axis from the front to the back. An identifiable or perceptible complete rotation of the femoral head in the hip socket does not take place. With just this movement, approx. 3 to 3½ times the body’s weight acts on the hip joint.

Abduction of the leg
When changing to a one-leg stance, one leg can be extended from the body (abduction) or rotated inwardly (adduction) for example in a crossed stance. Regardless of the direction, the respective supporting leg is then subject to approx. 3 times the body’s weight. The maximum angle that can be achieved with abduction is approx. 80° and roughly. 20° for adduction.

Crossing your legs
Crossing your legs, a typical movement when sitting, increases the rotational movements in the hip joint. In the process, it rotates in several directions.

Sitting
Even when sitting, the hip joint is subjected to the strain of approximately one third of the body’s weight due to the weight of the upper body. And just by standing up, this then increases to approximately 2 times the body’s weight.

Additional measured values that reflect stress and strain on the hip joint:
  • Normal walking: 2 to 3 times the body’s weight 
  • Jogging: approx. 5 to 6 times the body’s weight
  • Stumbling and falling: exerts a force of 7 times the body’s weight

All die auftretenden Belastungen müssen von einem künstlichen Gelenk getragen werden und sind auf Grund vorgeschriebener DIN Vorschriften mit definierten Belastungsgrenzen zu erfüllen.