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    Early mobilization after sliding and Z-lengthening of heel cord: a preliminary experimental study in rabbits
    (Springer-Verlag, 2001) Aktas, S; Ercan, S; Candan, L; Moralar, U; Akata, E
    Sliding lengthening and Z-lengthening techniques are widely used in heel cord lengthening. Even though most surgeons performing these procedures apply a short leg cast after surgery, their postoperative immobilization intervals vary from 3 to 7 weeks. Nather et al. showed that there was no need for immobilization after the musculotendinous lengthening of long, deep flexor tendons. In the present study, we aimed to show the healing process of heel cords lengthened by sliding and Z-plasty lengthening in rabbits that did not undergo any post operative immobilization. We performed sliding lengthening in the right heel cords of the rabbits and Z-lengthening in the left heel cords. We compared these two techniques radiographically, biomechanically, and histopathologically. Even though the biomechanical study showed superior results in the sliding lengthening group on the 7th day, elongation of the tendons at both sites was seen radiographically. There was no statistically significant difference between the sites according to the biomechanical study done on the 28th day. We concluded that the ankle should be immobilized in the early healing phase and that both types of lengthening gain a similar level of strength by the 4th week.
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    Three point load application in single tooth bending fatigue test for evaluation of gear blank manufacturing methods
    (Elsevier Sci Ltd, 2004) Akata, E; Altinbalik, MT; Çan, Y
    This study deals with the applicability of a single tooth bending fatigue test in the evaluation of gear blank manufacturing methods using three point bending loading. The single tooth bending test is an effective and rapid way of determination of the performances of gears instead of expensive and time-consuming life tests. Bending tests were applied to two groups of gears cut by hobbing and gear shaving from gear blanks. The first group of gear blanks was obtained by CNC-lathe machining from round bars and the second group of blanks was produced by closed-die upsetting. Both of the gear groups were additionally tested after case hardening by carburizing. It was shown that the three point bending test can easily be adapted and applied as an effective and rapid way of comparing the performances of such gears. (C) 2003 Elsevier Ltd. All rights reserved.