Elsevier

The Journal of Arthroplasty

Volume 27, Issue 8, September 2012, Pages 1429-1436
The Journal of Arthroplasty

Influence of Electron Beam Melting Manufactured Implants on Ingrowth and Shear Strength in an Ovine Model

https://doi.org/10.1016/j.arth.2012.02.025Get rights and content

Abstract

Arthroplasty has evolved with the application of electron beam melting (EBM) in the manufacture of porous mediums for uncemented fixation. Osseointegration of EBM and plasma-sprayed titanium (Ti PS) implant dowels in adult sheep was assessed in graduated cancellous defects and under line-to-line fit in cortical bone. Shear strength and bony ingrowth (EBM) and ongrowth (Ti PS) were assessed after 4 and 12 weeks. Shear strength of EBM exceeded that for Ti PS at 12 weeks (P = .030). Ongrowth achieved by Ti PS in graduated cancellous defects followed a distinctive pattern that correlated to progressively decreasing radial distances between defect and implant, whereas cancellous ingrowth values at 12 weeks for the EBM were not different. Osteoconductive porous structures manufactured using EBM present a viable alternative to traditional surface treatments.

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.

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