Traumatic injuries associated with the short lateral collateral ligaments of the talocrural joint of the dog

Abstract

ABSTRACTTraumatic ruptures of the short parts of the lateral collateral ligament complex of the talocrural joint in the dog, or avulsion fractures of the origins of insertions of these ligaments on the distal fibula or the lateral talar trochlea are reported in six cases. The anatomy, physiology and pathophysiology of injuries to these ligaments and related structures are discussed. This type of injury has specific clinical and, or, radiographic features. Minor rotational instability can be detected if the fibulocalcanear or both ligaments are ruptured, while disruption of only the fibulotalar ligament or its insertions cause no apparent instability. Clinical diagnosis of ligamentar ruptures often requires manual examination of the stressed joint under general anaesthesia. Radiographic diagnosis of avulsion fractures requires inclusion of oblique views. Avulsion fractures of the lateral talar trochlea produced relatively large loose fragments situated proximally. Any possible relation between osteochondritis dissecans and the avulsion fractures could not be evaluated. Reconstructive surgical therapy is advocated. Prognosis for return to full function seems fair to good.