Acetabular revision with a 7-mm lateral offset component inserted without cement in patients who have acetabular deficiency.
The lateral offset acetabular component, a reconstruction technique for hips with acetabular bone loss, causes a torsional moment because of the displacement of the center of hip rotation and may increase the risk of fixation failure. Eighteen patients who had an acetabular revision with a 7-mm offset cementless component were retrospectively studied to identify factors that influence outcome and to clarify indications for its use. The average follow-up time was 47 months and all patients were followed up for a minimum of 2 years or until the failure of the fixation. At the latest follow-up examination, 3 of the 18 cups had been revised for loosening, 1 cup had radiographic loosening, and 1 patient was considered a clinical failure. Clinical or radiographic failure was significantly more likely (P < .05) in patients with a higher shell abduction angle. On the basis of the definitive failures in more than one fourth of reconstructions at early follow-up, the routine use of this component is not recommended in revision surgery with acetabular deficiency.
McGrory
Brian J
BJ
Department of Orthopaedic Surgery and Rehabilitation, University of Vermont School of Medicine, Burlington, Vermont, and the Maine Joint Replacement Institute, Portland, ME 04104, USA.
D000077:Acetabulum / Q000473:pathology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006615:Hip / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies