[Role of pinna cartilage autograft on long bone healing in dog: radiographic and biomechanical studies]

ABSTRACT

To evaluate the feasibility of pinna cartilage autograft in healing of long bone defects in dogs. Experimental study. Mid-diaphyseal region of the right radial bone of ten Mongrel dogs of both sexes with average weight of 29 +/- 2.4 kg, which were randomly assigned to either control [n=5] or experimental group [n=5]. Creation of a bone gap at the mid-diaphyseal region of the right radius in each dog followed by cosmetic ear trimming. Insetion of a piece of pinna cartilage within the bone defect in experimental group was done and postoperative lameness scored. Radiographic evaluation in two views every 2 weeks for 70 days was performed. The dogs were euthanized after 70 days and their operated and intact radial bones were subjected to bending test. Repeated measures ANOVA and independent t-test were done for callus index measurements. Results of lameness scores were evaluated using Kruskal-Wallis test. Lameness scores were statistically improved in experimental group by the time, as compared with control group. Callus index was statistically greater in experimental group at 28, 42,56 and 70 days after surgery than the previous days. [P<0.05]. Biomechanical quality [maximum load, elastic modulus, and maximum bending moment] enhanced in the operated bones of experimental group. The results of this study revealed that pinna cartilage in dogs may be used as an available chondrocyte-rich autograft to enhance bone healing process in fractures at risk to enhance bone healing process in fractures at risk of delayed or non-union treatment of both conditions, and in bone defects