Influence of Electron Beam Melting Manufactured Implants on Ingrowth and Shear Strength in an Ovine Model
Section snippets
Materials and Methods
Six skeletally mature adult male sheep (crossbred Merino Wethers, 18 months, 54.8 ± 1.4 kg) were used with ethical consent from our institutional animal care and ethics body. Animals underwent a bilateral procedure in which n = 10 pre-prepared implant dowels (6-mm diameter and 25-mm long) were implanted into surgically created defects in the cancellous bone (n = 4) of the distal femur and proximal tibia [16] and cortical bone (n = 6) of the tibial diaphysis 12, 13, 14, 15, 16. The implantation
Results
Both RA and RQ surface roughness values for the EBM material were significantly higher than the Ti PS coating (P = .002 and P = .003, respectively). The RA and RQ values for the EBM and Ti PS coatings were 50.52 ± 8.54 μm and 62.15 ± 10.03 μm and 43.45 ± 5.90 μm and 53.95 ± 7.70 μm, respectively.
All animals recovered uneventfully after surgery and reached their allocated time point with no infections or postoperative morbidities noted.
Interfacial shear strength (megapascal) from the tibial
Discussion
In this study, 2 uncemented fixation surfaces (EBM and Ti PS) were assessed for mechanical and biologic fixation in cortical bone 12, 13, 14, 15 as well as the response in cancellous bone [16] using well-defined ovine models. Interfacial shear strength increased significantly with time for both implant types (P < .001). Twelve weeks postoperatively, the EBM achieved a value of 29.8 MPa, which was the higher of the 2 test surfaces. The Ti PS implant was incorporated into this study as a
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The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2012.02.025.