title: Radiographic assessment of cup migration in bipolar hip arthroplasty: intra-observer and interobserver errors and tolerance limits.
abstract: Statistical methods were used to calculate the possible observer error in measuring cup migration in bipolar hip arthroplasty from follow-up radiographs. Finding the "tolerance limits" by such methods helped in assigning the true significance of any observed change.
authors.affiliation: Department of Orthopaedic and Accident Surgery, Royal Liverpool Hospital, United Kingdom.
authors.forename: V P
authors.initials: VP
authors.lastname: Middha
authors.forename: K
authors.initials: K
authors.lastname: Singhal
mesh_terms: D000886:Anthropometry / Q000379:methods; D015982:Bias; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D015588:Observer Variation; D011859:Radiography