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At least 487 records · Page 27Linked to original sources
PubMed1994

Optimal graft fixation--the effect of gap size and screw size on bone plug fixation in ACL reconstruction.

In reconstruction of the anterior cruciate ligament (ACL), using central one-third patellar tendon graft, an early weak link is the bone plug junction. To study this, we carried out experiments to determine the relationship between gap size, screw size, and pullout force of patellar bone plugs inserted in the femur of the porcine model. Forty-nine porcine knees were obtained. Holes 11 mm in diameter were drilled in the intercondylar notch of the femur. Bone plugs fashioned from the patella were made to fit the holes with gap sizes of 1, 2, 3, or 4 mm. The bone plugs were inserted into the holes in the femur and secured by means of 20-mm-long screws (either 7- or 9-mm diameter). The bone plugs were then pulled out using a tensile testing machine and the pullout force was measured. The results suggest that a 7-mm (or a 9-mm) diameter screw can be used for gaps of 1 and 2 mm, and a 9-mm diameter screw should be used for gaps of 3 and 4 mm.

Animals↗
PubMed2002

Does sodium fluoride in bone cement affect implant fixation. Part II: evaluation of the effect of sodium fluoride additions to acrylic bone cement and the fixation of titanium implants in ovariectomized rabbits.

Bone integration of threaded implants made of cured polymethylmethacrylate containing sodium fluoride or commercially pure (c.p.) titanium were studied in normal and estrogen deficient New Zealand white rabbits. Nine had been ovariectomized through laparoscopy and nine served as controls. Four weeks after the ovariectomy two threaded implants made of cured bone cement with or without sodium fluoride addition were inserted in each tibia. One threaded commercially pure titanium implant was inserted in each patello-femoral joint flush to the cartilage. Six weeks after implant insertion measurement of the peak removal torque necessary to loosen the implants and light microscopical histomorphometrical investigations of tissue integration were performed. In the ovariectomized rabbits addition of sodium fluoride to the cement resulted in increased area of bone in the threads (p=0.04), but no corresponding effect could be noted in the controls. The removal torque was lower in the ovariectomized rabbits compared to the non-ovariectomized when comparing implant with sodium fluoride addition (p=0.02). The bone tissue response and the removal torque of the titanium implants were not influenced by ovariectomy in these rabbits.

Journal Article↗