Abstract
The selection of the bone graft type for stabilization of spinal fusion depends on availability, the clinical situation, and the desired mechanical stability. The authors determined the potential immediate postoperative compressive strength of various types of bone grafts under axial compression on a material testing machine. The fibular strut graft (5,070 ± 3,250 N, mean ± standard deviation [SD]) was significantly stronger (P < 0.05) than the anterior (1,150 ± 487 N) and posterior (667 ± 311 N) iliac crest grafts, and the rib grafts (452 ± 192 N). Hydroxyapatite grafts with a pore size of 200 μ were significantly stronger (P < 0.05) than those with a pore size of 500 μ (1,420 ± 480 N versus 338 ± 78 N). Ethylenoxide sterilization had no significant effect on the immediate compressive strength. Bicortical and tricortical Bailey-Badgley and Cloward bone grafts also were compared. Results showed that all cervical graft types may be sufficiently strong to support sizable loads.
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