title: Groin pain following hip resurfacing: a case-control study.
abstract: We compared 47 patients with groin pain following hip resurfacing to a matched control group. Functional scores and plain radiographs were assessed along with measurement of whole blood cobalt and chromium by inductively coupled mass spectrometry. Symptomatic patients underwent ultrasound scan of the affected hip. Mean functional outcomes were poor in those with pain and good in the control group. Groin pain was associated with valgus stem positioning and lower neck:head ratio (relatively narrow neck) (p=0.03, p=0.04 respectively). We classified patients with groin pain into two groups: biological and mechanical. The biological group had soft tissue abnormalities on USS and higher levels of cobalt and chromium (p=0.04, p=0.05 respectively). The mechanical group had normal USS, lower metal ion levels and more retroverted femoral components (p=0.01).
authors.affiliation: Department of Orthopaedic Surgery, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK. john.mcarthur@hotmail.com
authors.forename: John R
authors.initials: JR
authors.lastname: McArthur
authors.forename: Matthew
authors.initials: M
authors.lastname: Costa
authors.forename: Damian R
authors.initials: DR
authors.lastname: Griffin
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Krikler
authors.forename: Nicholas
authors.initials: N
authors.lastname: Parsons
authors.forename: Pedro R
authors.initials: PR
authors.lastname: Foguet
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D016022:Case-Control Studies; D002857:Chromium / Q000097:blood; D003035:Cobalt / Q000097:blood; D005260:Female; D057925:Femoracetabular Impingement / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D005500:Follow-Up Studies; D006119:Groin; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D010149:Postoperative Pain / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D017699:Pelvic Pain / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D011859:Radiography; D016059:Range of Motion, Articular
chemical_list: D002857:Chromium; D003035:Cobalt