To calculate the torque of the head around the implant only the force and the leverarm is needed (N [Nm] = F [N] * x [m]). The force F is a product of the mass M [kg] multiplied by the acceleration g [m/s(2)]. The leverarm is the distance between the center of the head of femur and the implant center on a horizontal line.\n\nResults: Using 50% of 75 kg body weight a torque of 0.37Nm for the 1 mm decentralized position and 1.1Nm for the 3 mm decentralized position of the implant was calculated. At 250% BW, appropriate to a normal step, torques of 1.8Nm (1 mm) and 5.5Nm (3 mm) have been calculated. Comparing of the experimental and theoretical results shows that both screws fail in the
same magnitude as torques occur in a more than 3 mm de-central positioned implant.\n\nConclusion: We conclude the center-center PRIMA-1MET position in the head of femur of any kind of lag screw or blade is to be achieved to minimize rotation of the femoral head and to prevent further mechanical complications.”
“Background: Cardiac rehabilitation in patients after myocardial infarction (MI) is a component of secondary prevention that has an established role in the current guidelines.\n\nAim: To determine the effect of physical training on exercise capacity parameters selleck chemical determined
on the basis of cardiopulmonary exercise test (CPET) in patients after MI. We also evaluated the relationship between the number of training sessions and BI 2536 exercise capacity.\n\nMethods: We prospectively evaluated 52 patients after MI who underwent percutaneous
coronary intervention of the infarct-related artery. At the start of the training, patients had no symptoms of heart failure and coronary artery disease. Electrocardiographic exercise test was performed 4 to 6 weeks after MI, followed by CPET in patients with a negative stress test. After determination of the initial exercise capacity, patients underwent 12 training sessions on a cycle ergometer with a workload determined on the basis of anaerobic threshold or heart rate reserve. After 12 training sessions, CPET was performed, followed by another 12 training sessions and a follow-up CPET.\n\nResults: All patients showed a significant increase in exercise capacity parameters: energy expenditure during CPET increased from 9.39 to 11.79 METs, peak oxygen uptake (VO(2)peak) increased from 32.32 to 39.25 mL/kg/min (p < 0.001), and oxygen uptake at the anaerobic threshold increased from 18.34 to 24.65 mL/kg min (p < 0.001). The initial 12 training sessions resulted in a statistically significant increase in VO(2)peak from 32.32 to 36.75 mL/kg/min (p = 0.003), while subsequent 12 training sessions were related with an insignificant increase in VO(2)peak from 36.75 to 39.25 mL/kg/min (p = 0.065).\n\nConclusions: Regular physical activity improves exercise capacity as measured by CPET.