title: Biomechanical Comparison of Locking Compression Plate and Limited Contact Dynamic Compression Plate Combined with an Intramedullary Rod in a Canine Femoral Fracture-Gap Model.
abstract: OBJECTIVE
  To compare the biomechanical properties of locking compression plate (LCP) and a limited contact dynamic compression plate combined with an intramedullary rod (LC-DCP-R) in a cadaveric, canine, femoral fracture-gap model.
  
  
  METHODS
  In vitro biomechanical study; nonrandomized, complete block (dog).
  
  
  METHODS
  Paired cadaveric canine femora (n = 10 dogs).
  
  
  METHODS
  Paired femurs with a mid-diaphyseal 20 mm gap were stabilized with either LCP or LC-DCP-R. Nondestructive testing up to 60% of body weight (BW) was followed by a continuous destructive test. Comparative structural properties, 3-dimensional (3D) interfragmentary motion, and plate linear strain were evaluated. Paired comparisons were made between LCP and LC-DCP-R.
  
  
  RESULTS
  Stiffness after nondestructive testing was significantly lower for LCP with a mean (95% confidence interval [CI]) of 61 N/mm (46-76) versus 89 N/mm (67-110) for LC-DCP-R (P = .0072). Ultimate load to failure was significantly lower for LCP with a median (interquartile range [IQR]) of 270 N (247-286) versus 371.5 (353-385) for LC-DCP-R (P = .002). Axial motion at 60% BW was significantly higher for LCP with a median (IQR) of 1.01 mm (0.71-1.26) versus 0.36 mm (0.20-0.49) for LC-DCP-R (P = .002). Shear motion was significantly higher for LCP with a median (IQR) of 1.18 (0.78-1.58) versus 0.72 mm (0.45-1.00) for LC-DCP-R (P = .018). Strain was significantly higher for mid-LCP surface with a mean (95%CI) at 60% BW of 979 μdef (579-1378) versus 583 μdef (365-801) at mid-LC-DCP-R surface (P = .0153). The elastic limit strain of the plates was not different and was reached at a mean (95%CI) load of 241 N (190-292) for LCP versus 290 N (245-336) for LC-DCP-R (P = .12).
  
  
  CONCLUSIONS
  The LC-DCP-R showed higher stiffness and resistance to failure, lower interfragmentary motion, and lower plate strain and stress compared to LCP.
authors.affiliation: Centre Hospitalier Vétérinaire Saint-Martin, Saint Martin Bellevue, France.
authors.forename: Luis
authors.initials: L
authors.lastname: Matres-Lorenzo
authors.affiliation: Equipe Biomécanique et Remodelage Osseux (EPBRO), École Nationale Supérieure d'Arts et Métiers, Paris, France.
authors.forename: Amadou
authors.initials: A
authors.lastname: Diop
authors.affiliation: Equipe Biomécanique et Remodelage Osseux (EPBRO), École Nationale Supérieure d'Arts et Métiers, Paris, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Maurel
authors.affiliation: Equipe Biomécanique et Remodelage Osseux (EPBRO), École Nationale Supérieure d'Arts et Métiers, Paris, France.
authors.forename: Marie-Charlotte
authors.initials: MC
authors.lastname: Boucton
authors.affiliation: Centre Hospitalier Vétérinaire Saint-Martin, Saint Martin Bellevue, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Bernard
authors.affiliation: Centre Hospitalier Vétérinaire Saint-Martin, Saint Martin Bellevue, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Bernardé
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001858:Bone Nails / Q000662:veterinary*; D001860:Bone Plates / Q000662:veterinary*; D002102:Cadaver; D018483:Diaphyses / Q000293:injuries* / Q000601:surgery; D004285:Dogs / Q000293:injuries* / Q000601:surgery; D005260:Female; D005264:Femoral Fractures / Q000601:surgery / Q000662:veterinary*; D008297:Male; D013314:Stress, Mechanical