abs: Morphometric Study of the Canine Shoulder
_{Small Animal Scientific Abstracts}

Osteosarcoma frequently affects the canine proximal humerus. In veterinary medicine no satisfactory therapeutic option is available to preserve the function of the limb. 3D-printed personalized prostheses would be a valuable therapeutic option. Morphometric data are needed to design the prostheses. They are currently lacking in canine patients. Our objective was to acquire morphometric data needed to refine the design of the prostheses. MRI was performed on one canine cadaveric thoracic limb. Muscles of interest were identified using a medical images software (Mimics©). Mormophetric data were recorded for each of the 19 muscles. The same canine cadaver was then dissected to measure the same variables. Those data were used in silico to model the relative importance of each muscle during motion. All muscles were successfully identified with data consistent with the dissected cadaveric data. Some muscles were more challenging to isolate on the MRI, namely the heads of the triceps, superficial pectoral and latissimus dorsi. Relative repartition of muscle volume was similar to historical data. The first modeling with a cuff-rotatory model prosthesis showed the importance for the shoulder stability of the superficial pectoral (transversus), latissimus dorsi, infraspinatous and subscapularis.  MRI is a useful tool to collect morphometric data but imperfect if used solely. This approach was a first attempt to validate more general morphometric data that could be used to refine the design of 3D-printed personalized prostheses for limb-sparing of the proximal humerus. Further imaging studies are warranted to refine our model.