Berger et al: The use of subchondral bone topography to approximate the center of rotation of the elbow joint in dogs
Veterinary Surgery 1, 2023

🔍 Key Findings

• COR of elbows with FMCP was significantly more caudal compared to normal elbows, based on CT-derived geometry.
• In normal elbows, 74% of medial and 93% of lateral axes exited cranial and distal to the epicondyles.
• In FMCP elbows, 81% of medial and 70% of lateral axes exited caudal and distal to the epicondyles.
• Different landmark combinations produced slightly different COR approximations, especially between humeral vs. radius/ulna-based axes.
• The medial-lateral axis using trochlea and capitulum centers provided the most consistent COR approximation.
• COR estimations based on diseased elbows may not match normal joint geometry, impacting implant alignment accuracy.
• External epicondylar landmarks may be useful intraoperatively to estimate COR location, but variability limits precision.
• Drill diameter size may buffer small COR differences, but impact in advanced disease or bilateral cases remains unclear.