Transcript ACL Prevention - Columbia University

Ravi Chacko CEO
Chase McCaleb CFO
Walker Plash CMO
Perry Yin CTO
George Zhou CRO
Design Problem
Each year in the US 100,000-200,000 people sustain a
ruptured or torn ACL. (Mayo Clinic)
Surgery >$10,000
Rehab >$10,000
Emotional, social and productivity costs
Known Risk Factors
 Screening for risk factors has shown reduction in
injury rates (Hewett)
 Physiological Factors
 Hormones, Sex, Leg Dominance, Joint Laxity/Recurvation
 Behavioral Factors
 Landing/Jumping
 Limb position and resulting stresses on knee, hip, and ankle
 Toe to heel shock absorption
 Side-step/Cut
 muscle firing patterns
Design Brief
 Standardize 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
Flock of Birds
Motion Capture
Biodex System
KINE Live
Spring Loaded Goniometer
Components
 Testing Modality
 Landing, Cutting, Jumping
 Sensors
 Accelerometer
 Gyroscopes
 Electromyogram (EMG)
 Pressure Sensor
 Goniometer
 Displacement Sensor
 Output
 Risk factors
 Targeted training regimen
 Live biofeedback
ProLand
 Risk Factors Tested:
 Knee Angle
 Ankle Pronation
 Components:
 Gyroscopes
 Pressure Sensor
 Display
ProCut
 Risk Factors:
 Delay in activation of
Vastus Lateralis (VL),
Semitendinosis (ST)
during sidecut
 Components
 EMG on VL and ST
 Accelerometer/gyroscope
 Display
VL-ST delay:
Risk Group:
Zebis et al. 2009
ProScore
 Risk Factors:
 Knee and hip landing angle
 Ankle and foot arch pronation
 Ligament Dominance
 Knee Abduction moment
 Knee stability (Anterior-Posterior)
Hip Angle:
 Components
Knee Angle:
 Goniometers
Medial Knee motion:
 Pressure Sensors
Abduction Moment:
Stability:
 Gyroscopes
Dynamic Foot
 Wireless Transmitter
Pronation:
 Display
Ankle Pronation:
Thank you
 Dr. Paul Sadja
 Associate Professor of Biomedical Engineering
 Jim Gossett
 Associate Athletics Director for Sports Medicine
 Paige Plash
 Physical Therapist, COO Encore Rehabilitation
 Dr. Elizabeth Hillman
 Assistant Professor of Biomedical Engineering
 Keith Yeager
 Senior Staff Associate, Laboratory Manager
Questions?