The Blue Bay KA is designed to measure the anterior-posterior placement of the tibia relative to the patella. This is to aid in diagnosis of knee cruciate ligament injuries (ACL and PCL). The KA is indicated for use in providing a quantitative assessment of knee laxity in anterior-posterior loading.The Hollis Ankle Arthrometer™ was developed to provide objective measurement of the Anterior-Posterior Laxity and Inversion Laxity of the Ankle-Subtalar Joint Complex. The Blue Bay KA is designed to measure the anterior-posterior placement of the tibia relative to the patella. This is to aid in diagnosis of knee cruciate ligament injuries (ACL and PCL). The KA is indicated for use in providing a quantitative assessment of knee laxity in anterior-posterior loading.The Hollis Ankle Arthrometer™ was developed to provide objective measurement of the Anterior-Posterior Laxity and Inversion Laxity of the Ankle-Subtalar Joint Complex.