MKATS: Mizzou Knee Arthrometer Testing System

MKATS Video Abnormal knee motion has been linked to injury risk and pathology. Methods to accurately measure bone motion during dynamic activities, particularly non-sagittal plane motion, are not currently available in the clinic.  Marker based methods to measure tibiofemoral motion are limited by skin artifact. Radiographic methods, such as dual fluoroscopy, are limited by high cost and limited access to specialized equipment.  The MKATS (Patent Pending) is a portable device that accurately measures three-dimensional tibiofemoral motion during dynamic activities. The MKATS uses electromagnetic motion sensors and clamps fixated to bony landmarks of the distal femur and proximal tibia. A series of calibration steps and computational algorithms determine the knee axis-of-rotation and anatomical axes. Flexion-extension, varus-valgus, and internal-external rotation angles are reported during dynamic activities such as step-up. The device has been successfully used to measure tibiofemoral motion efficiently and accurately during functional activities in the clinic. 

The images show the MKATS during a step-down task for a subject wearing an ankle foot orthotic (AFO). The graphs show differences in knee motion (20 subjects) for step-down activities with (AFO) and without (Control) an ankle foot orthotic. Statistically significant differences in knee motion  have also been measured between healthy and ACL deficient populations.


Mizzou PASS: Point of Care Assessment System

MPASS Video The Mizzou PASS (Patent Pending) is designed to provide portable and affordable in-clinic assessments that incorporate dynamic balance, dual-task deficits, and reaction time. The Mizzou PASS measures multiple dynamic balance constructs including center of pressure, vertical ground reaction forces, motion of body segments, and reaction time. Potential applications for the Mizzou PASS include early detection of individuals with mild cognitive impairment and concussion diagnosis and clinical decision making for safe return to activity. The Mizzou PASS can quantitatively measure dual task deficits of postural responses during dynamic balance and functional movement tasks. Dynamic postural control ability, dual-task, and reaction time constructs are evidenced as impaired in those who sustain a concussion and are correlated with increased subsequent injury risk to include lower extremity as well as subsequent head trauma. The MPASS combines lightweight portable force plates, markerless motion capture, and reaction time measurements to provide a more affordable and a more precise multi-dimensional assessment solution. The goal of the MPASS is to improve care, save money and ensure safety for patients who have suffered a concussion injury.