Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
A two-month-old Quarterhorse was presented for evaluation of a severe val gal ('knock-kneed') angulation of the carpi and diarrhea of two to three days' duration. The angular deformity had been present since birth. At one month of age, the foal had experienced pneumonia and a draining tract on the left carpus, but these were not evident on presentation.
Stelling, Dave and McNeel, Sandra
"What's Your Radiographic Diagnosis?,"
Iowa State University Veterinarian: Vol. 47
, Article 14.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol47/iss1/14