title: Ultrasound screening of periarticular soft tissue abnormality around metal-on-metal bearings.
abstract: Although metal hypersensitivity or pseudotumors are concerns for metal-on-metal (MoM) bearings, detailed pathologies of patterns, severity, and incidence of periprosthetic soft tissue lesions are incompletely understood. We examined the potential of ultrasound for screening of periarticular soft tissue lesions around MoM bearings. Ultrasound examinations were conducted in 88 hips (79 patients) with MoM hip resurfacings or MoM total hip arthroplasties with a large femoral head. Four qualitative ultrasound patterns were shown, including normal pattern in 69 hips, joint-expansion pattern in 11 hips, cystic pattern in 5 hips, and mass pattern in 3 hips. Hips with the latter 3 abnormal patterns showed significantly higher frequency of clinical symptoms, without significant differences of sex, duration of implantation, head sizes, and cup abduction/anteversion angles, compared with hips with normal pattern. Ultrasound examination provides sensitive screening of soft tissue reactions around MoM bearings and may be useful in monitoring progression and defining treatment for periarticular soft tissue abnormalities.
authors: Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, Japan.
authors: Takashi
authors: T
authors: Nishii
authors: Takashi
authors: T
authors: Sakai
authors: Masaki
authors: M
authors: Takao
authors: Hideki
authors: H
authors: Yoshikawa
authors: Nobuhiko
authors: N
authors: Sugano
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000601:surgery; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D006967:Hypersensitivity / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology; D015994:Incidence; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008670:Metals; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D010020:Osteonecrosis / Q000601:surgery; D011474:Prosthesis Design; D011859:Radiography; D017695:Soft Tissue Injuries / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000209:etiology*; D014463:Ultrasonography
chemical_list: D008670:Metals