'Exeter' plastic hip joint, 1985.
© Science Museum / Science & Society Picture Library
Stainles steel and ultra high molecular weight polythene hip replacement, known as the 'Exeter' hip joint, made by Howmedica. Plastic joints such as this are used in an increasing number of operations to replace worn and damaged joints. One of their main advantages to patients and surgeons is that the body does not reject them as foreign material.