Fig. 5

Comparison of the average values of von Mises stress under the walking condition. a PROFEMUR® Preserve. b PROFEMUR® TL. Von Mises stress during the gait condition shows a mountain-shaped von Mises stress distribution with zone 4 as the apex with the Preserve and zone 4 or 5 as the apex with the PROFEMUR® TL. In the PROFEMUR® Preserve, the von Mises stress generated around the stem is higher in the extended position than in the flexed position. The stem anteversion is different; however, the PROFEMUR® Preserve has lower stress in zones 1 and 7 than does the PROFEMUR® TL. PROFEMUR® Preserve and PROFEMUR® TL are manufactured by MicroPort Orthopedics (Arlington, TN, USA)