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OVERALL: Great Job on Video Exam

Excellent job on the video exam! Class median and mean scores, shoulder, elbow, radioulnar, and wrist joint details from "Basic Biomechanics" by Susan Hall, muscle contribution to joint stability, and potential knee joint injury positions. Let's strengthen together for improvement!

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OVERALL: Great Job on Video Exam

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  1. OVERALL: Great Job on Video Exam • Median: 74% (half of the class scored 71% or higher) • Mean: 74% (class average) • 72% of class scored 70% or higher • 31% of class scored 80% or higher • 50% of class improved over October Mid-Term grade Those that did not do as well as expectedlet’s get together to see what happenedand move onward & upward

  2. Upper Extremities Parts • Shoulder Girdle • Shoulder Joint • Elbow Joint • Radioulnar Joint • Wrist Joint

  3. Types of Synovial Joints from “Basic Biomechanics” by Susan Hall page 121

  4. Muscle Contribution to Joint • Stronger Muscles = More Joint Stability • Angles of Pull influence Joint Stability • Stabilizing Angles = < 90 angle of pull • Dislocating Angles = > 90 angle of pull

  5. Shoulder Girdle • Involved in Reaching/Grasping Motions • Designed for Mobility • Unstable joint • Strength of Muscles VERY important

  6. Shoulder Joint • Involved in a wide variety of motions • Designed for Mobility, Unstable joint • Rotator Cuff & Deltoids = small angle pull • Wheel-Axle Mechanism

  7. Overarm Throw Pattern • “cocking action” = extreme lateral rotation • rapid medial rotation and protraction • Strengthen Medial Rotators BOTH Concentrically and Eccentrically

  8. Elbow Joint • Only Flexion and Extension • Stable joint due to bony structure • Muscle arrangement = stabilizing effect

  9. How to Strengthen Elbow Extensors • Elbow Extensions with shoulder flexed figure 2.5e on page 61 • Shoulder Hyperextensions with elbow extended figure 2.5d on page 61

  10. 3 Ways to Strengthen Elbow Flexors • Elbow flexion from anatomical position • Elbow flexion with shoulder Hyperextended • shoulder flexion figure 2.5j on pg 62 

  11. Radioulnar Joint • Unstable due to weak bony arrangement • Pronate = turn inward [medial] away from anatomical position • Supinate = turn outward [lateral] back toward anatomical position figure 5.12 left side of picture pronatedpage 185 right side of picture supinated

  12. Wrist Joint • MSDs - musculoskeletal disorders 1. angle of the work surface 2. position requirements of the work 3. magnitude & direction of applied forces 4. Degree of repetition • CTS - Carpal Tunnel Syndrome • see Force guidelines per task on page 189

  13. Hip Joint • Medial rotation involved in kick, throw & strike • Wheel-Axle - figure 6.5 and 6.6 [page 197] A: medial B: lateral hip rotation

  14. Hip Joint • Bending/Stooping = increase FA resistive • to achieve equilibrium, hip extensors must provide high Tension/Force [hams, back] FIG 9-30 “Basic Biomechanics”3rd Edition by Susan J. Hall

  15. Knee Joint • Biarticulate Muscles - work knee and hip • Muscular Imbalances: 1. Hams - lateral vs. medial lateralis 2. Quads - vastus lateralis and medialis • Positions for potential injury 1. Foot fixed while hip/trunk rotates 2. Squats [FIG 6.11 pg 204] 3. Whip kick in Breaststroke [FIG 6.12 pg 205]

  16. Knee Joint: Potential Injury Positions page 205

  17. Knee Joint: Potential Injury Positions turning the bodywhile foot is fixed FIG 6.8 page 200

  18. Knee Joint: Potential Injury Positions Deep Squatchanging axis of rotationfrom knee jointtocalf/thigh area FIG 6.11 page 204

  19. Knee Joint: Potential Injury Positionsrehabilitation of knee injuries page 260: studies on ACL stress, shear forces, petellofemoral contact

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