The influence of surface porosity on gap-healing around intra-articular implants in the presence of migrating particles |
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Authors: | Rahbek Ole Kold Soren Zippor Berit Overgaard Soren Soballe Kjeld |
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Institution: | Orthopedic Research Laboratory, Aarhus University Hospital, N?rrebrogade 44, Building 1A, DK-8000 Aarhus C, Denmark. ole_rahbek@hotmail.com |
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Abstract: | The aim of the present study was to compare the effect of two different porous coatings on bone ongrowth and on the peri-implant migration of polyethylene (PE) particles. Porous-coated cylindrical implants with an either plasma-sprayed closed-pore coating (Pl) or titanium fiber metal open-pore coating (Fi) were inserted intra-articular in exact fit or with a 0.75 mm peri-implant gap. A weight-loaded implant device in the distal femur was used. We used a randomized paired design in eight dogs. PE particles were injected repeatedly intra-articular in the knee until the dogs were killed after 8 weeks. Fi implants had significantly more bone ongrowth 8 (0-21)% compared with Pl implants 0 (0-0)% in gap situations and reduced the number of peri-implant PE particles significantly. Among exact-fitted implants we found that peri-implant tissue around Pl implants consisted of significantly more fibrous tissue than around Fi implants. A sealing effect against the migration of PE particles was found for both Fi and Pl implants in exact fit. |
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