Show me the steps to solve How would you determine the stess (equation only) of the sound side tibia of a lower extremity amputee? In a different patient of equal weight, would the magnitude of stress be higher or lower if this patient had a tibia smaller than the first patient?
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If you stand on one leg, the load exerted on the hip joint is 2.4 times your body weight. Assuming a simple cylindrical model for a hip implant, with a cross-sectional area of 5.6 cm2, estimate the following: a) The corresponding stress on the hip implant in a 175-lb individual: ………………. [MPa] (0.2) b) If the hip implant is made of Ti-6Al-4V (120 GPa elastic modulus), what is the strain for the current loading conditions? ………………. (0.1) c) Complete solution (please show your work on a scrap paper, scan it, and insert the image below) (0.1)
Adriano C.
a) What is the maximum compressive force, Fmax, that both tibias can withstand without compressive fracture? The maximum compressive stress of compact bone is 1.7x10^8 N/m^2 and the tibia has a cross-sectional area of 3 cm^2. Poor Landing Technique: If a person lands flat on both feet stiffly, without bending the knees or having the heel slightly raised, the deceleration distance, D, is approximately 1 cm. b) Determine the maximum jump height, Hmax, poor, without compressive fracture of the tibial bones. Use kinematic equation and Newton's 2nd Law to first show that the average force required to decelerate the person is Fdecel = mgH/D, where m is the mass of the person. (Mass of person is 75 kg). Good Landing Technique: By bending the knees with heels up during the landing, the deceleration distance, D, is effectively increased to approximately 0.6 m. c) Determine the maximum jump height, Hmax, good in this case. Limiting Factor (Ligaments & Tendons): The result in part (b) will prevent bone fracture. However, by bending the knees and landing on the balls of the feet, it is the ligaments (knee) and tendons (Achilles) in the legs which are more likely to be injured. These can only withstand a force of about 1/20 of the maximum compressive force on the tibia calculated in part (a). d) What is the maximum jumping height, Hmax, using good technique, which will not result in tendon, ligament, or bone injury?
Sri K.
$\bullet$$\bullet$ A fractured tibia. While a fractured tibia (the larger of the two major lower leg bones in mammals) is healing, it must. be held horizontal and kept under some tension so that the bones will heal properly to prevent a permanent limp. One way to do this is to support the leg by using a variation of the Rus- sell traction apparatus. (See Figure $5.70 .$ ) The lower leg (including the foot) of a particular patient weighs $51.5 \mathrm{N},$ all of which must be supported by the trac- tion apparatus, (a) What must be the mass of $W$ . showth in the figure? (b) What traction force does the apparatus provide alone the direction of the leg?
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