In vitro biomechanical comparison of 3.5mm LC-DCP/intramedullary rod and 5mm clamp-rod internal fixator (CRIF)/intramedullary rod fixation in a canine femoral gap model.
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OBJECTIVE: To compare the biomechanical properties of clamp rod internal fixation (CRIF)/rod and LC-DCP/rod constructs in a canine femoral gap model. STUDY DESIGN: Cadaveric biomechanical study. SAMPLE POPULATION: Canine femora (n=10 pair). METHODS: Femora with 40mm ostectomies were assigned to LC-DCP/rod or CRIF/rod treatment groups. Five construct pairs had 4-point bending and 5 pairs had torsional loading. Construct stiffness, strength, and bending angle at failure or permanent angular deformation (torsional loading) were determined. Statistical comparisons were performed using Student t tests; significance was set at P.05. RESULTS: There was significantly greater permanent angular deformation, or residual twist, in the CRIF/rod constructs (23.10.89) compared with LC-DCP/rod constructs (7.472.08). Whereas there was no significant difference in torsional stiffness of these constructs at torsional loads <4.92Nm (P=.819), LC-DCP/rod constructs had significantly greater torsional stiffness (0.3030.079Nm/) and strength (11.5462.79Nm) than CRIF/rod construct stiffness (0.060.013Nm/) and strength (6.0780.527Nm) at torsional loads >4.92Nm. Differences in stiffness and strength in 4-point bending were not statistically significant. CONCLUSIONS: LC-DCP/rod constructs had significantly less permanent angular deformation than CRIF/rod constructs. CRIF/rod constructs became less stiff as torsional load was increased, thus the LC-DCP/rod constructs had significantly greater torsional stiffness and strength under high torsional loads. LC-DCP/rod and CRIF/rod constructs performed similarly under 4-point bend loading conditions.
Bonin, G. A., Baker, S. T., Davis, C. A., Bergerson, C. M., Hildebrandt, A. A., Hulse, D. A., ... Saunders, W. B.
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Bonin, Glen A||Baker, Sean T||Davis, Caleb A||Bergerson, Christie M||Hildebrandt, Aubrey A||Hulse, Don A||Kerwin, Sharon C||Moreno, Michael R||Saunders, W Brian
