Which condition is most likely indicated by an open sore above the hoof and purulent discharge in a steer?

The presence of an open sore above the hoof accompanied by purulent discharge in a steer suggests a condition that is likely associated with infection or inflammation in the foot area. Septic arthritis is characterized by the joint being infected, which can result in pus formation and systemic signs of illness. If the joint has postural or locomotor issues, there's often swelling or heat around the affected area, and this may present with a drainage wound or discharge above the hoof.

In cases of septic arthritis, particularly in cattle, the infection may arise secondary to various factors, such as a penetrating wound or trauma to the foot, which aligns with the observation of an open sore. This condition can cause significant pain and lameness, leading the animal to present with these clinical symptoms.

The other conditions listed, while related to hoof or foot problems, would typically present differently. For example, digital dermatitis commonly presents as a distinct hoof lesion but usually not specifically as an open sore above the hoof or with purulent discharge of this nature. Interdigital fibroma, on the other hand, involves tissue growths that would not typically show drainage or an open sore. Sole abscesses often manifest as localized swelling beneath the hoof capsule and are marked by a different type of pain