title: Usefulness of ultrasonography for detection of pseudotumors after metal-on-metal total hip arthroplasty.
abstract: We retrospectively analyzed 83 metal-on-metal total hip arthroplasties in 74 patients. Ultrasonography and magnetic resonance imaging (MRI) of each hip were performed to detect abnormal patterns and pseudotumors. We examined the reliability of ultrasonography for detecting pseudotumors in comparison with MRI. We also compared the acetabular component inclination between patients with and without pseudotumors. The mean positive and negative predictive values for pseudotumor detection by ultrasonography were 65% and 91%, respectively. The mean positive and negative likelihood ratios were 5.78 and 0.32, respectively. There was no clear association between pseudotumor presence and acetabular component inclination. We concluded that ultrasonography is a suitable technique to screen for the presence of pseudotumors. We also need to distinguish between bearing-related and taper junction corrosion-related complications.
authors.affiliation: Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan.
authors.forename: Kunihide
authors.initials: K
authors.lastname: Muraoka
authors.affiliation: Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Naito
authors.affiliation: Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan.
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Nakamura
authors.affiliation: Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan.
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Hagio
authors.affiliation: Department of Radiology, Fukuoka University Faculty of Medicine, Fukuoka, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Takano
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D005260:Female; D006104:Granuloma, Plasma Cell / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000209:etiology; D006622:Hip Prosthesis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D061825:Metal-on-Metal Joint Prostheses / Q000009:adverse effects*; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014463:Ultrasonography
keywords: adverse local tissue reaction (ALTR); metal-on-metal bearings; pseudotumor; total hip arthroplasty; ultrasonography