Radioulnar Interosseous Ligament Diseases in Dogs: A Case Series.

RUIN and RULD are distinct radioulnar ligament diseases with different breed predispositions requiring differentiation.

This multicenter retrospective case series analyzed 233 dogs with radioulnar interosseous ligament disease, identifying two distinct entities: radioulnar ischemic necrosis (RUIN) and radioulnar ligament desmopathy (RULD). RUIN (115 cases) presented with focal cortical lysis on the caudal radius and cranial ulna, primarily affecting small chondrodystrophic breeds. RULD (118 cases) showed smooth bone proliferation on the lateral antebrachial bones, predominantly in large nonchondrodystrophic breeds. Elbow dysplasia was frequently observed as a comorbidity in both conditions. Clinical presentation in referral cases typically included mild to moderate forelimb lameness responsive to conservative management. The study highlights that these are underrecognized orthopedic entities with distinct breed predispositions and radiographic characteristics. Differentiation between RUIN and RULD is essential for accurate diagnosis and appropriate case management. The findings provide a foundation for future research into pathogenesis and evidence-based treatment protocols.

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