The value of contrast arthrography in assessing loosening of symptomatic uncemented total hip components |
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| Authors: | Robert L Barrack MD Michael Tanzer MD FRCS Susan V Kattapuram MD Dr William H Harris MD |
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| Institution: | (1) Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston, Massachusetts, USA;(2) Hip and Implant Unit, Department of Orthopaedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA;(3) Present address: Department of Orthopaedic Surgery, Tulane University School of Medicine, 1430 Tulane Ave., 70112 New Orleans, LA, USA;(4) Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA;(5) Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital and Harvard Medical School, 32 Fruit Street, 02114 Boston, MA, USA |
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| Abstract: | Twenty-five patients with symptomatic uncemented total hip components were studied with contrast arthrography prior to surgical exploration. All but one had uncemented femoral stems and 16 had an uncemented acetabular component. As judged by the findings at surgery, on the femoral side the sensitivity, specificity, and accuracy of arthrography were 57%, 60%, and 58% respectively. There was a relatively high incidence of both false positives (17%) and false negatives (25%). On the acetabular side sensitivity, specificity, and accuracy were 29%, 89%, and 62.5%. False negatives were common (31%), while there was only one false positive. The results in this small series show that arthrography has distinct limitations in identifying the fixation status of uncemented total hip components. |
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| Keywords: | Arthrography Uncemented loosening Total hip replacement |
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