An ex vivo investigation of the effect of the TATE canine elbow arthroplasty system on kinematics of the elbow

Objective To devise a kinematic technique to objectively ascertain the location and orientation of the centre of rotation of the canine elbow and to compare this axis following arthroplasty with the first generation TATE™ prosthesis in an ex vivo model. Methods Five pairs of cadaveric forelimbs were obtained and proximal limb soft tissues removed. Pin‐mounted reflective markers were applied to the humerus and ulna. Limbs were mounted on a frame and six trials of the elbow manually cycled through its sagittal range of motion captured using 4 Qualisys cameras at 120 Hz. Radiography was performed to identify marker position. TATE™ cartridges were implanted and kinematic analysis repeated. Kinematic data were imported into custom software and the three‐dimensional joint centre of rotation defined using a closed‐form solution for absolute orientation. Paired t tests were performed to determine if the centre of rotation of the elbow differed significantly (P