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A 65-year-old woman presented with a 20-year history of seropositive rheumatoid polyarthritis. Her disease had destroyed most of her major joints of the body, including both knees, hips, elbows, wrists, finger joints, spine and joints of the feet. She had undergone a successful bilateral total knee replacement surgery 7 years ago.
For the past 2 years, she had been having difficulty in standing and walking with 'noises' coming from both hip joints. An X-ray of the pelvis (anteroposterior view) showed severe bilateral hip arthritis ( figure 1 ) with migration of the femoral head (R>L) into the pelvis (protrusio...