TY - JOUR
T1 - Is metal-on-metal squeaking related to acetabular angle of inclination?
AU - Bernasek, Thomas
AU - Fisher, David
AU - Dalury, David
AU - Levering, Melissa
AU - Dimitris, Kirk
N1 - Funding Information:
The following authors certify that they act as consultants and receive royalties from DePuy Inc (TB, DD, DF). Each author certifies that his or her institution has approved the reporting of these cases and that all investigations were conducted in conformity with ethical principles of research. This work was performed at the Florida Orthopaedic Institute and Foundation for Orthopaedic Research and Education
PY - 2011/9
Y1 - 2011/9
N2 - Background Postoperative audible squeaking has been well documented in ceramic-on-ceramic hip prostheses, and several metal-on-metal (MOM) THA designs, specifically those used for large-head resurfacing and MOM polyethylene sandwich designs, and are attributed to different implant- and patient-specific factors. Current literature does not identify the incidence of squeaking in modular MOM THA or possible etiologic factors. Questions/purposes Our purposes were to (1) identify the incidence of squeaking in modular MOM prostheses in THA; (2) determine whether males or females were more likely to have squeaking; and (3) determine whether the incidence of squeaking relates to acetabular inclination angle. Methods We retrospectively reviewed the patient records and radiographs of 539 patients (542 hips) from three independent centers who underwent a MOM THA between February 2001 and December 2005. Demographic and implant factors were evaluated, including measurement of cup inclination angles. The minimum followup was 36 months (mean, 76 months; range, 36-119 months). Results We identified squeaking in eight of the 542 hips (1.5%); five were in women and two were in men (one patient had bilateral squeaking). The time to onset of patient-reported audible squeaking averaged 23 months (range, 6-84 months). Squeaking was more likely to occur in women (six of eight hips). No hips with 45° or less acetabular inclination squeaked (291 hips); eight of 251 hips (3.2%) with inclination angles greater than 45° squeaked. Patients who reported squeaking had higher inclination angles than those who did not report squeaking. Conclusions Our observations suggest an increased frequency of squeaking in female patients and in patients with greater inclination angles with this MOM implant design.
AB - Background Postoperative audible squeaking has been well documented in ceramic-on-ceramic hip prostheses, and several metal-on-metal (MOM) THA designs, specifically those used for large-head resurfacing and MOM polyethylene sandwich designs, and are attributed to different implant- and patient-specific factors. Current literature does not identify the incidence of squeaking in modular MOM THA or possible etiologic factors. Questions/purposes Our purposes were to (1) identify the incidence of squeaking in modular MOM prostheses in THA; (2) determine whether males or females were more likely to have squeaking; and (3) determine whether the incidence of squeaking relates to acetabular inclination angle. Methods We retrospectively reviewed the patient records and radiographs of 539 patients (542 hips) from three independent centers who underwent a MOM THA between February 2001 and December 2005. Demographic and implant factors were evaluated, including measurement of cup inclination angles. The minimum followup was 36 months (mean, 76 months; range, 36-119 months). Results We identified squeaking in eight of the 542 hips (1.5%); five were in women and two were in men (one patient had bilateral squeaking). The time to onset of patient-reported audible squeaking averaged 23 months (range, 6-84 months). Squeaking was more likely to occur in women (six of eight hips). No hips with 45° or less acetabular inclination squeaked (291 hips); eight of 251 hips (3.2%) with inclination angles greater than 45° squeaked. Patients who reported squeaking had higher inclination angles than those who did not report squeaking. Conclusions Our observations suggest an increased frequency of squeaking in female patients and in patients with greater inclination angles with this MOM implant design.
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U2 - 10.1007/s11999-011-1900-4
DO - 10.1007/s11999-011-1900-4
M3 - Article
C2 - 21512812
AN - SCOPUS:80053333960
SN - 0009-921X
VL - 469
SP - 2577
EP - 2582
JO - Clinical orthopaedics and related research
JF - Clinical orthopaedics and related research
IS - 9
ER -