Introduction

• Calcaneoquartal subluxation due to plantar-tarsal ligament rupture.
• Common injury in racing/coursing dogs and middle-aged Collie types, especially Shetland Sheepdog; bilateral involvement not uncommon.
• Cause: in the athlete usually occurs during racing, usually isolated injury but may be in association with other tarsal fractures/luxation, especially centrodistal luxation.
• In domestic pet (Collie, Shetland Sheepdog) rarely present with history of trauma - may not be presented until problem is bilateral.
• Signs: joint pain, plantigrade stance with proximal intertarsal hyperextension.
• Diagnosis: examination.
• Treatment: calcaneoquartal arthrodesis.
• Prognosis: good if adequate treatment.

Pathogenesis

Etiology

• Athlete - stresses of racing.
• Pet - rarely a history of trauma, ligament degeneration?

Diagnosis

Treatment

Outcomes