What Is Your Diagnosis

摘要

A 1-week-old Quarter Horse foal was examined prior to treatment for bilateral flexural deformity of the distalportions of the forelimbs. The foal was successfully treated and discharged with instructions to introduce it to paddockexercise. At that time, no abnormal flexural or angular deformities of the carpi were noticed. At 3 weeks of age, the foalwas readmitted because of a sudden onset of non-weight-bearing lameness on the left forelimb. Physical examinationof the foal's left forelimb elicited signs of severe pain during flexion of the carpus and there was noticeable laxity withinthe joint, allowing lateral deviation of the metacarpus, which was associated with a mild crepitus. Carpal valgus (16 was evident in the same limb. Mild effusion was noticed in the radiocarpal and intermediate carpal joints. Results of aCBC and serum biochemical analyses, as well as the cell counts and protein concentrations in fluid obtained from bothjoints by arthrocentesis, were within reference ranges. After standard radiographic views of the carpus were obtained,slightly oblique views were also obtained to better detect any pathologic lesions (Figure 1).