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.
author list (cited authors)
Bonin, G. A., Baker, S. T., Davis, C. A., Bergerson, C. M., Hildebrandt, A. A., Hulse, D. A., ... Saunders, W. B.
complete list of authors
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