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In Vivo Biomechanical Evaluation of a Novel Angle‐Stable Interlocking Nail Design in a Canine Tibial Fracture Model
Author(s) -
Déjardin Loïc M.,
Cabassu Julien B.,
Guillou Reunan P.,
Villwock Mark,
Guiot Laurent P.,
Haut Roger C.
Publication year - 2014
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2014.12136.x
Subject(s) - ostectomy , medicine , callus , intramedullary rod , lameness , bone healing , tibial fracture , orthodontics , tibia , anatomy , surgery , genetics , biology
Objective To compare clinical outcome and callus biomechanical properties of a novel angle stable interlocking nail (AS‐ILN) and a 6 mm bolted standard ILN (ILN6b) in a canine tibial fracture model. Study design Experimental in vivo study. Animals Purpose‐bred hounds (n = 11). Methods A 5 mm mid‐diaphyseal tibial ostectomy was stabilized with an AS‐ILN (n = 6) or an ILN6b (n = 5). Orthopedic examinations and radiographs were performed every other week until clinical union (18 weeks). Paired tibiae were tested in torsion until failure. Callus torsional strength and toughness were statistically compared and failure mode described. Total and cortical callus volumes were computed and statistically compared from CT slices of the original ostectomy gap. Statistical significance was set at P < .05 Results From 4 to 8 weeks, lameness was less pronounced in AS‐ILN than ILN6b dogs ( P < .05). Clinical union was reached in all AS‐ILN dogs by 10 weeks and in 3/5 ILN6b dogs at 18 weeks. Callus mechanical properties were significantly greater in AS‐ILN than ILN6b specimens by 77% (failure torque) and 166% (toughness). Failure occurred by acute spiral (control and AS‐ILN) or progressive transverse fractures (ILN6b). Cortical callus volume was 111% greater in AS‐ILN than ILN6b specimens ( P < .05). Conclusions Earlier functional recovery, callus strength and remodeling suggest that the AS‐ILN provides a postoperative biomechanical environment more conducive to bone healing than a comparable standard ILN.