Plano Orthopedic Sports Medicine and Spine Center, Plano, Texas 75093, USA.
Arthroscopy. 2013 Sep;29(9):1546-51. doi: 10.1016/j.arthro.2013.06.006. Epub 2013 Jul 31.
To compare the load-to-failure pullout strength of bone-patellar tendon-bone (BPTB) allografts in human cadaver tibias and rigid polyurethane foam blocks.
Twenty BPTB allografts were trimmed creating 25 mm × 10 mm × 10 mm tibial plugs. Ten-millimeter tunnels were drilled in 10 human cadaver tibias and 10 rigid polyurethane foam blocks. The BPTB anterior cruciate ligament allografts were inserted into these tunnels and secured with metal interference screws, with placement of 10 of each type in each material. After preloading (10 N), cyclic loading (500 cycles, 10 to 150 N at 200 mm/min) and load-to-failure testing (200 mm/min) were performed. The endpoints were ultimate failure load, cyclic loading elongation, and failure mode.
No difference in ultimate failure load existed between grafts inserted into rigid polyurethane foam blocks (705 N) and those in cadaver tibias (669 N) (P = .69). The mean rigid polyurethane foam block elongation (0.211 mm) was less than that in tibial bone (0.470 mm) (P = .038), with a smaller standard deviation (0.07 mm for foam) than tibial bone (0.34 mm).
All BPTB grafts successfully completed 500 cycles. The rigid polyurethane foam block showed less variation in test results than human cadaver tibias.
Rigid polyurethane foam blocks provide an acceptable substitute for human cadaver bone tibia for biomechanical testing of BPTB allografts and offer near-equivalent results.
比较骨-髌腱-骨（BPTB）同种异体移植物在人尸体胫骨和刚性聚氨酯泡沫块中的极限失效拔出强度。
修剪 20 个 BPTB 同种异体移植物，制成 25mm×10mm×10mm 胫骨塞。在 10 个人体尸体胫骨和 10 个刚性聚氨酯泡沫块中钻 10mm 隧道。将 BPTB 前交叉韧带同种异体移植物插入这些隧道中，并使用金属干扰螺钉固定，每种材料各放置 10 个。在预加载（10N）后，进行循环加载（500 个循环，10 至 150N，200mm/min）和极限失效测试（200mm/min）。终点为极限失效载荷、循环加载伸长和失效模式。
插入刚性聚氨酯泡沫块（705N）和尸体胫骨（669N）中的移植物之间的极限失效载荷无差异（P=0.69）。刚性聚氨酯泡沫块的平均伸长量（0.211mm）小于胫骨骨（0.470mm）（P=0.038），且标准差（泡沫为 0.07mm）小于胫骨骨（0.34mm）。
所有 BPTB 移植物均成功完成 500 个循环。刚性聚氨酯泡沫块的测试结果变化小于人体尸体胫骨。
刚性聚氨酯泡沫块为 BPTB 同种异体移植物的生物力学测试提供了一种可接受的人体尸体胫骨替代物，并且提供了几乎相同的结果。
