1. Axis of Rotation of the Canine Elbow Joint.
- Author
-
C., Berger, N., Yair, R., Amzallag Lombrozo, R., Doust, C., Ober, and J., Milgram
- Subjects
- *
ELBOW joint , *RADIAL bone , *ELBOW , *FORELIMB , *ROTATIONAL motion , *HUMERUS - Abstract
The high complication rate of total elbow replacement in dogs may be due to failure to align implants with the axis of rotation (AOR) of the joint as seen in people. This study aimed to define the AOR in normal and diseased elbow joints in dogs. CT scans of 9 dogs’ forelegs with unilateral fragmented medial coronoid process (healthy legs served as control) were converted into 3D models and uploaded into the implant design program. A system of axes was embedded in the humeral condyle of all models. Four spheres were generated using the contours of the subchondral bone of the radius, ulna, trochlea, and capitulum. A circle was generated using the depression between the capitulum and trochlea. Four axes were generated using pairs of geometric shapes. Medial and lateral images showing the exit locations of the axes were captured and imported into ImageJ. Distances from the origin of the system of axes (OSOA) to the location where each axis exited the medial and lateral cortex, of healthy and pathologic joints, were measured and compared. In normal joints, the location of the AOR was cranial and distal to the (OSOA) on both sides of the humeral condyle. The size of the area on the medial and lateral aspect of the humeral condyle was 4.5 mm x 6.6 mm (lateral) and 4.3 mm x 7.7 mm (medial), respectively. The AOR of the elbow joint can be defined relative to landmarks on the humeral condyle. Described landmarks may facilitate accurate and consistent placement of elbow implants. [ABSTRACT FROM AUTHOR]
- Published
- 2022