Hip Prosthesis Essay

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------------------------------------------------- The Hip Figure 1 shows a labelled diagram of the anatomy of the hip A total hip prosthesis refers to the complete replacement of the hip joint with an artificial joint. The main function of a hip prosthesis is to reduce pain and restore joint mobility and function. The prosthesis needs to be tough, durable, mobile and resistant to the corrosive effects of organic acids in the blood. The hip joint is a ball and socket joint compromising of articulation between the deep cup of the acetabulum and the head of the femur. The main purpose of the hip joint is to support the body and for locomotion. As such, the hip joint contains many ligaments, muscles, cartilage, tendons and a capsule in order to strengthen the joint and allow friction free movement between bones. Any degeneration of theses can lead to hip weakness. ------------------------------------------------- Clinical Indications The main causes of hip joint degeneration are osteoarthritis, rheumatoid arthritis and hip fractures and a prosthesis is normally offered when these diseases begin to affect the everyday life of the patient. Figure 2 shows the effect of arthritis on the hip joint. Osteoarthritis is the most common form of arthritis and is caused due to inflammation around the joint damaging cartilage and causing bones to rub against each other, causing pain. Finally, bony growths will be formed around the joint. Osteoarthritis usually develops in people over 50 and is more common with family history and in women. Rheumatoid arthritis is an autoimmune disease which causes chronic inflammation of the synovial lining of the joint and causes pain and stiffness. In later stages of the disease ligaments, tendons and bone are damaged leading to deformation – this is normally when a hip replacement is offered. This disease can begin in early childhood
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