Working as a Scrub Nurse, Maureen assisted Sir John with the instrumentation for the operation, ensuring that it was sterile and well maintained.
Maureen remembers the high standards Sir John Charnley insisted people worked to and his career-long quest to improve every part of the surgical process.
A longer version of this interview can be seen at Wrightington Hospital in Hip Histories. The exhibition is set in Sir John Charnley's biomechanics laboratory and tells the story of his pioneering work in orthopaedic surgery.
Maureen Abraham was interviewed by Dr Francis Neary.
Sir John was a perfectionist when it came to surgical instruments and he would not be satisfied until an instrument did exactly what he wanted it to in his mind.
He designed 17 different types of wire tighteners. He would often shelve a current instrument in favour of a more recent idea, only to come back to it months later and further modify it.