Hip replacement surgery. Image 5 of 9. Prosthetic femoral stem (metal shaft ending in yellow cylinder) attached to its applicator ready for use in hip replacement surgery. The shaft of the stem is driven into the femur (thigh bone). A spherical cap is placed over the yellow cylinder to form the ball of the hip joint. Joints may need to be replaced after injury, disease or deformity. This hip is being replaced because of congenital hip dysplasia, a condition where the hip joint does not fit together properly, causing it to dislocate frequently and to become worn. For a sequence showing the operation see M551/418- M551/426.
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