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Biological and mechanical characteristics of the interface between a new swelling anchor and bone
Author(s) -
Gualtieri Gina M.,
Siegler Sorin,
Hume Eric L.,
Kalidindi Surya R.
Publication year - 2000
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.1100180324
Subject(s) - swelling , implant , materials science , fixation (population genetics) , biomedical engineering , in vivo , femoral condyle , condyle , orthodontics , surgery , composite material , medicine , anatomy , cartilage , biology , population , environmental health , microbiology and biotechnology
We recently evaluated the peak pullout loads for anchors made from our new copolymeric swellingtype material compared with anchors made of a nonswelling material. In vitro and in vivo peak pullout loads of these anchors were evaluated after different intervals of implantation in the lateral femoral condyles of New Zealand White rabbits. Scanning electron microscopy and energy dispersive x‐ray analyses were additionally performed on selected retrieved samples after pullout to examine the characteristics of bone attachment to the implant. The mean peak pullout load was greater for the swelling anchors than for the nonswelling anchors after 48 hours in vitro (46.0 ± 15.8 compared with 10.8 ± 9.1 N, p = 0.0541). After 2 weeks in vivo , it was significantly greater for the swelling anchors than for the nonswelling controls (177.7 ± 41.3 compared with 53.7 ± 17.5 N, p = 0.0024). The peak pullout load was also greater for the swelling anchors after 8 weeks in vivo ; however, this difference was less pronounced than at 2 weeks (101.8 ± 35.0 compared with 58.9 ± 9.7 N, p = 0.0508). Furthermore, the swelling implants tended to induce bone deposition at the bone‐implant interface. Results from this investigation reveal that the new family of dynamic implants has potential for applications requiring fixation to cancellous or osteoporotic bone.