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SAMPLE PROBLEM 3.3 How much compressive stress is present...
SAMPLE PROBLEM 3.3 How much compressive stress is present on the L1, L2 vertebral disc of a 625 N woman, given that approximately 45% of body weight is supported by the disc (a) when she stands in anatomical position and (b) when she stands erect holding a 222 N suitcase? (Assume that the disc is oriented horizontally and that its surface area is 20 cm.) Solution 1. Given: Formula: F = (625 NX0.45) A = 20 cm stress - FA (625 N)(0.45) stress 20 cm? stress - 14 N/cm? 2. Given: Formula: F = (625 N)0.45) + 222 N stress - F/A (625 N)(0.45) + 222 N stress - 20 cm stress - 25.2 N/cm?