Fig. 6
From: The effect of metal artefact on the design of custom 3D printed acetabular implants
Pre and post implant removal reconstructed anatomies, a and b respectively. Parts in red represent the missing bone between the 2 CT reconstructions . Case 1: The volume of metal adjacent to the superior rim (cage, screws and femoral head) dramatically affected the true bony anatomy of the superior rim which resulted in a major change in the design of the 3D printed implant. Cases 2, 3, 5 and 6: images a showed reduced bone in the superior acetabular rim, b showed absent medial acetabular wall due to bone removed at surgery or not clearly visible on pre-removal scan. Case 4: the anterior wall was absent in the post-implant removal CT reconstruction (b). For case 7 and 8, the acetabular implant was loose and migrated into the pelvis and away from the innominate bone. Minimal differences between pre and post implant removal scans were seen