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 45º or less acetabular inclination squeaked (291 hips); eight of 251 hips (3.2%) with inclination angles greater than 45º 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.
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 45º or less acetabular inclination squeaked (291 hips); eight of 251 hips (3.2%) with inclination angles greater than 45º 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.
Authors: Claire L Brockett; Phil Harper; Sophie Williams; Graham H Isaac; Rob S Dwyer-Joyce; Zhongmin Jin; John Fisher Journal: J Mater Sci Mater Med Date: 2007-11-08 Impact factor: 3.896
Authors: William L Walter; Gary C O'toole; William K Walter; Andrew Ellis; Bernard A Zicat Journal: J Arthroplasty Date: 2007-03-28 Impact factor: 4.757
Authors: Gregory G Polkowski; Ryan M Nunley; Erin L Ruh; Brandon M Williams; Robert L Barrack Journal: Clin Orthop Relat Res Date: 2012-11 Impact factor: 4.176