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ProKnee Professional Protection

ProKnee Professional Protection. Ravi Chacko CEO Chase McCaleb CFO Walker Plash CMO Perry Yin CTO George Zhou CRO. ACL Injury Background…. 100,000 -200,000 ruptured per year 1 60,000-75,000 ACL reconstructions annually 2 Costs range from $20-50k without insurance, $800-3,000 with

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ProKnee Professional Protection

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  1. ProKneeProfessional Protection Ravi Chacko CEO Chase McCaleb CFO Walker Plash CMO Perry Yin CTO George Zhou CRO

  2. ACL Injury Background… • 100,000 -200,000 ruptured per year1 • 60,000-75,000 ACL reconstructions annually2 • Costs range from $20-50k without insurance, $800-3,000 with • 150x more likely to re-injure3 1. Mayo Clinic Online 2. JD Hubbell, MD; E Schwartz, MD; http://emedicine.medscape.com/article/89442-overview 3. Dunn et al 2004

  3. Reasons for ACL Tears… • Planting and cutting • Straight-knee landings Causing… • Hyperextention of the knee • Excessive inward rotation

  4. Market • CDC estimates 7.2 million high school athletes in the U.S.1 • Approximately 4 million professional athletes. • Affects anyone involved in: • Volleyball • Basketball • Soccer • Football • Gymnastics • And more CDC: MMWR; September 29, 2006 / 55(38);1037-1040; http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5538a1.htm

  5. Known Risk Factors • Physiological Factors • Hormones, Sex, Leg Dominance, Joint Laxity/Recurvation • Behavioral Factors • Landing/Jumping • Torso position and resulting stresses on knee • Toe to heel shock absorption • Side Cut • Quad and Hamstring firing patterns

  6. Risk Factors- Zebis Mette K. Zebis (7/09) • Found that a difference in VastusLateralis and Semitendinosus firing 10ms before a side cut led to a significantly increased chance for ACL rupture.

  7. Risk Factors - LESS Lindsay J. DiStefano (2009) • Used Landing Error Scoring System (LESS) before and after training to show that landing errors can be improved with training. • Current prototype can capture knee flexion and displacement • May Prototype will include a hip component that will capture trunk flexion

  8. Components • EMG • Vastus Lateralis • Semitendinosus • 2 IMU 6DOF Sensors • 3 Gyroscopes • 3 Accelerometers • 4 Pressure Sensors • Amplifier • NIDAQ & Arduinos

  9. Force Sensor Capture • Original Design 2 sensors • Heel and Toe • Ankle pronation and impact time • 1st Prototype 4 Sensors • 1st and 5th metatarsal, heel and big toe • Time of impact, ankle and foot pronation

  10. Force Sensor Analysis • Vertical Jump Test (x2) • Toe (red) is used primarily during takeoff • 1st (cyan) and 5th metatarsal (green) are used primarily during landing • Heel (blue) is kept off the ground

  11. EMG Capture • EKG electrodes placed at the VL and ST • Grounded at the abdomen • System contains a circuit for a DC offset so we can view both positive and negative values

  12. EMG Analysis • Purpose: to capture the difference in average activity (% of max) in the 10 ms prior to cut. • Method: • Sync • Filter • Threshold • RMS

  13. Motion Capture • Inertial Measurement Units (IMU) consist of 4 perpendicular accelerometers and 4 perpendicular gyroscopes • IMUs attached to brace at the calf and thigh • Record linear acceleration and rotational velocity, each in 3 dimensions at each point

  14. Motion Capture Analysis

  15. Motion Capture Analysis

  16. Side Cut

  17. Side Cut

  18. Future Plans Final Prototype • Lightweight and wireless • Free movement This Semester • Stay tethered, but clean up wires to increase mobility • Expand to include multiple tests • Multiple test subjects

  19. Development Timeline • Interpret data collected from gyros/accelerometers • Increase mobility • Improve EMG analysis • Connect mechanical to bioelectric data • Create GUI for data collection and analysis

  20. Future Business Plan • Phase II: Research and Development • Distribute to athletic teams for data collection • Prove that we can actually predict risk factors • Phase III: Initial Release • Target athletic teams, gyms, and physical therapists. • Projected cost of use: • $250 initial startup fee • $50 per athlete per analysis • Phase IV: Review and Expansion • Ultimately target home users

  21. Thank you • Keith Yeager • Aaron Kyle • Prof. GordanaVunjak-Novakovic • Prof. Elizabeth Hillman • Prof. Paul Sadja • Project Advisor • Matthew Bouchard & IckBhumiratana • Lauren Grosberg • Jim Gossett • Associate Athletics Director for Sports Medicine • Paige Plash • Physical Therapist, COO Encore Rehabilitation

  22. Questions?

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