Acetabular reconstruction by impacted cancellous allografts in cementless total hip arthroplasty revision.

ABSTRACT

OBJECTIVE: The aim of this study was to evaluate the primary and secondary stability, where 100% or virtually 100% of the uncemented acetabular component contacted with impacted cancellous allografts, focusing especially on the amount of graft used and rim contact. METHODS: Fifteen cases of acetabular reconstruction using impacted cancellous allografts and cementless porous-coated component in which 100% or virtually 100% of the component contacted only with the allograft were reviewed. Mean follow-up was 97.5 (range 58 to 130) months after revision. The Harris hip score was used to evaluate clinical results. Radiographic evaluations were done using standard anteroposterior views obtained at the final follow-up. RESULTS: Two patients underwent re-revision. The mean Harris hip score of the remaining 13 patients was 88.3±11.9 (range 68 to 100) at the final follow-up. Early postoperative radiographs showed mean angle of inclination of 45° (range 30° to 55°). There was a mean migration of 6.2±7.8 (range 0 to 29) mm and the migration amount did not differ according to rim contact (p=0.054). There was no correlation between migration and amount of graft used (p>0.05). There was a significant correlation between migration and follow-up time (p<0.01). CONCLUSION: Our results imply that 50% host bone contact is not absolutely necessary to form a stable construct while restoring the centre of hip rotation.