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
Rupture of the antirior cruciate ligament is a relatively common problem. Degenerative change and/or trauma accompanied with over extension of the stifle may result in complete or partial tears of the stifle ligaments, A diagnosis of a ruptured anterior cruciate ligament can be made by eliciting abnormal movement in the joint.
Hoefle, William and Eich, David
"Repair of Ruptured Anterior Cruciate Ligament in the Dog,"
Iowa State University Veterinarian: Vol. 36
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol36/iss1/12