Abstract
Aim: To investigate the migration and rotation patterns of the socket in hip revisions with impacted morselized allograft bone and cement. Methods: 17 Exeter socket revisions were followed by radiostereometry (RSA) and radiography for 5 years. The surgical procedure described by the Nijmegen group in Netherlands was used. The allograft bone chips were prepared in a bone mill and had an approximate size of 3 mm. Results: All but 1 socket migrated proximally (accuracy 0.2 mm).
Five socket revisions with a radiolucent line > 2 mm in at least 1 zone had a migration and a rotation rate 2–5 times larger (broken lines) than 12 socket revisions (unbroken lines) without a radiolucent line > 2 mm. Allograft resorption in at least 2 zones was observed in all these 5 revisions but in 4 of them no progression of the radiolucent line was seen after the 2 years and there was no clinical deterioration or threat to bone stock.
In 8 of the revisions radiographic signs of trabecular incorporation or remodeling of the graft were observed. No rerevision was performed. Conclusions: Further follow-up is needed for evaluation of the clinical relevance of radiolucent lines in impaction grafting. As a consequence of these findings a RSA study using larger bone chips has been started.
Theses abstracts were prepared by Professor Dr. Frantz Langlais. Correspondence should be addressed to him at EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
