KIN 100 1st Edition Lecture 17 Injury and muscle biomechanics The etiology of Injury Event reconstruction Video analysis kinematics kinetics Other techniques simulations Instron testing equipment tests joint one end ligament tendon etc is fixed a load is placed on the other end to determine characteristics Load Deformation Curve Yield point point of physical change yi el Low d velocit Failure p yHigh point velocit oi y nt Failure point Stress total force of object area where force is produced Measurement of tissue properties applications autografts from patient autografts from donor replacements materials dacron gor tex Does ankle taping reduce range of motion measuring range of motion pre tape 78 post tape 42 after 20 min 62 after 60 min 69 after 180 min 96 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Jobe Tommy John reconstruction reconstruction of a forearm tendon used to stabilize elbow Medical Ulnar collateral ligament UCL is replaced with tendon from elsewhere usually in forearm Does reconstruction enhance strength measured maximal torque to failure stiffness force distance Overuse injuries moderate muscular forces repeated applications of force across bone results numerous microfractures stress fractures not always visible by x ray General rules for equipment design increase impact area transfer force to another part of body limit relative motion of body part add mass to body part reduce friction between contacting surfaces absorb energy Q angle taken from slide formed by two line segments tibial segment femoral segment typically 18 22 degrees females are slightly greater abnormal q angles increase knee and lower back pain Causes wider hips females knock knees genu valgum weak vastus medialis knee extension muscle on inner thigh foot pronation Altering q angle orthotics strength training surgery Muscle Force Length Relationship L0 Force Length Taken from slides Force Velocity Relationship force velocity Practical applications of models tendon transfers change insertion site of tendons on muscles to help person walk normally
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