title: Radiostereometric analysis in hip revision surgery--optimal time for index examination: 6 patients revised with impacted allografts and cement followed weekly for 6 weeks.
abstract: We revised the hip (6 stems and 5 sockets) with impacted morselized allografts and cement in 6 patients. We followed prosthetic migration by roentgen radiostereometric analysis (RSA) every 7th day for 6 weeks after the first (index) examination performed on the first postoperative day before mobilization. Most of the migration occurred during the first 2 weeks. In most cases more than half of the distal stem migration was seen between the 1st and 14th days. In all cases, the stem and socket migrations slowed down gradually and several prosthetic components had become stable after 5 weeks. We conclude that it is essential to perform the index RSA examination on the 1st or 2nd day after surgery and to state when and how weight bearing should be permitted. Otherwise it will be difficult to compare prosthetic migration in various studies and define normative values for migration predicting survival.
authors.affiliation: Department of Orthopedics, Hässelholm-Kristianstad County Hospital, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Ornstein
authors.forename: H
authors.initials: H
authors.lastname: Franzén
authors.forename: R
authors.initials: R
authors.lastname: Johnsson
authors.forename: M
authors.initials: M
authors.lastname: Sundberg
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001843:Bone Cements / Q000627:therapeutic use; D019544:Equipment Failure Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010780:Photogrammetry / Q000379:methods*; D011182:Postoperative Care / Q000379:methods; D011237:Predictive Value of Tests; D011475:Prosthesis Failure; D011859:Radiography / Q000379:methods*; D012016:Reference Values; D012086:Reoperation; D016019:Survival Analysis; D013997:Time Factors; D014184:Transplantation, Homologous; D016474:Weight-Bearing
chemical_list: D001843:Bone Cements