Ravi Chacko CEOChase McCaleb CFO

Walker Plash CMOPerry Yin CTO

George Zhou CRO

Design ProblemEach year in the US 100,000-200,000 people sustain a ruptured or torn ACL. (Mayo Clinic)

Surgery >$10,000Rehab >$10,000

Emotional, social and productivity costs

Known Risk FactorsScreening for risk factors has shown reduction

in injury rates (Hewett)

Physiological FactorsHormones, Sex, Leg Dominance, Joint Laxity/Recurvation

Behavioral FactorsLanding/Jumping

Limb position and resulting stresses on knee, hip, and ankle

Toe to heel shock absorptionSide-step/Cut

muscle firing patterns

Design BriefStandardize ACL screening and

preventative training

Method:Measure leg mechanics (e.g. position,

angle, forces) during jumping, landing or cutting

Determine risk factors and generate personalized training regimen to correct for those factors

Constraints and Specifications Health and Safety

Should not overexert or injure user Sensor device must be reusable

Cost Customers will pay <$500 for this type of diagnostic equipment Insurance may supplement cost

Reliability and Use Results promptly displayed after testing Imaging modality has sufficient resolution to determine position

accurately Calculations and results must yield significant medical benefit Should allow freedom of movement for accurate results

Comfort Device must be comfortable to wear with dimensions similar to

athletic clothing Cannot impede usual athletic movement

Existing Products

Spring Loaded Goniometer

Flock of BirdsMotion Capture

KINE Live

Biodex System

ComponentsTesting Modality

Landing, Cutting, Jumping

OutputRisk factors Targeted training regimenLive biofeedback

ProLandRisk Factors

Tested:Knee AngleAnkle Pronation

Components:GyroscopesPressure SensorDisplay

ProCutRisk Factors:

Delay in activation of Vastus Lateralis (VL), Semitendinosis (ST) during sidecut

ComponentsEMG on VL and STAccelerometer/

gyroscopeDisplay

Zebis et al. 2009

VL-ST delay: Risk Group:

ProScoreRisk Factors:

Knee and hip landing angleAnkle and foot arch pronationLigament DominanceKnee Abduction momentKnee stability (Anterior-

Posterior)Components

GoniometersPressure SensorsGyroscopesWireless TransmitterDisplay

Hip Angle:Knee Angle:Medial Knee motion:Abduction Moment:Stability:Dynamic Foot Pronation:Ankle Pronation:

Thank youDr. Paul Sadja

Associate Professor of Biomedical EngineeringJim Gossett

Associate Athletics Director for Sports MedicinePaige Plash

Physical Therapist, COO Encore Rehabilitation Dr. Elizabeth Hillman

Assistant Professor of Biomedical EngineeringKeith Yeager

Senior Staff Associate, Laboratory Manager

Questions?