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Assessing torsion of the medial cortex of the canine tibia using computed tomography multiplanar reconstruction
Author(s) -
Hette Khadije,
Anderson A. A.,
Barnes D. M.
Publication year - 2016
Publication title -
journal of small animal practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 67
eISSN - 1748-5827
pISSN - 0022-4510
DOI - 10.1111/jsap.12461
Subject(s) - medicine , tibia , anatomy , contouring , computed tomography , torsion (gastropod) , cortex (anatomy) , orthodontics , surgery , biology , engineering drawing , neuroscience , engineering
OBJECTIVES To describe a protocol for the measurement of tibial rotational alignment using CT multiplanar reconstructions. To establish the feasibility of producing general guidelines for the amount of torsional contouring to apply to a bone plate applied to the medial aspect of the tibia during repair of a non‐reducible tibial fracture. METHODS CT scans of the pelvic limbs of 15 chondrodystrophic and 34 non‐chondrodystrophic dogs were studied. Medial tibial cortex torsion angle and distal medial tibial cortex angle were determined from CT multiplanar reconstructions. Medial plate application was simulated using a plate contoured to the group mean medial tibial cortex torsion angle and post‐simulation tibial rotational alignment was assessed. RESULTS Mean medial tibial cortex torsion angles were 23° (chondrodystrophic) and 26° (non‐chondrodystrophic). Following simulated plate application the change in medial tibial cortex torsion was less than 10° in 73% of chondrodystrophic and 93% of non‐chondrodystrophic tibias. In total, 93% of chondrodystrophic and 97% of non‐chondrodystrophic tibias had post‐simulation distal medial tibial cortex angle less than 10° from the group mean pre‐simulation distal medial tibial cortex angle. CLINICAL SIGNIFICANCE Medial tibial cortex torsion and tibial rotational alignment can be measured using the protocol described in this study. 26° of internal torsional tibial plate pre‐contouring may be appropriate for non‐chondrodystrophic dogs, but further clinical validation is required.