Eleven hips in 9 patients with surgical implantation of bipolar femoral prosthesis were observed for average 5.6 years(range from 3 years to 8.5 years), focusing on migration of acetabular cup of femoral prosthesis by the roentgenography.
At latest follow-up examination, four of eleven hips showed more than 5mm migration of acetabular cup of femoral prosthesis, among these four cases, three cases required a revision surgery because of persistent pain.
Three of eleven hips showed less than 3mm migration of acetabluar cup of femoral prosthesis, remaining of four of eleven hips showed no migration of acetabular cup of prosthesis.
Authors think that many factors such as activity of patients, bone quality, age and weight of patients, etc, contributes to the migration of acetabular cup of bipolar femoral prosthesis.
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