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- Author or Editor: Murat Korkmaz x
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Biomechanical Comparison of Achilles Tenotomy and Achilloplasty Techniques in Young Rats
An Experimental Study
Background: Tendo Achillis lengthening is performed by means of Z-plasty in the classic treatment of clubfoot. In the Ponseti method for treating clubfoot, Achilles tenotomy is performed percutaneously for residual equine deformity. A randomized study was designed to compare tendon healing after tenotomy versus Z-plasty.
Methods: Thirty-six Sprague-Dawley rats were divided randomly into two groups. On the first day, while the right tendo Achillis of group 1 rats underwent tenotomy, those of group 2 rats underwent Z-plasty. Nine rats from each group were humanely killed on days 21 and 45 postoperatively. The two groups were compared with each other biomechanically and histologically. The Achilles tendons of eight rats in each group were evaluated biomechanically, and the remaining rat in each group underwent histologic evaluation.
Results: Mean ± SD maximum load at rupture of the treated tendons on days 21 and 45 in the tenotomy group was 26.38 ± 7.31 N and 47.16 ± 15.36 N, respectively, and in the Z-plasty group was 27.37 ± 5.20 N and 45.27 ± 9.59 N, respectively. The biomechanical evaluation revealed no significant difference in terms of breaking forces between the two groups. The difference between breaking forces on days 21 and 45 was statistically significant for both groups.
Conclusions: Tendons in the tenotomy group healed as well as those in the Z-plasty group, and Achilles tenotomy in the rat was similar to Z-plasty for Achilles tendon lengthening. Human correlation may or may not exist, but this study suggests that it should be considered and investigated. (J Am Podiatr Med Assoc 99(3): 216–222, 2009)
Abstract
Background: The aim of this study was to create AO 44 A1, B1 and C1 fractures using finite element analysis (FEA), to determine the stability of k-wire, intramedullary screw (IS) and plate-screw (PS) fixation methods in fracture
Methods: Using FEA the post-reduction behaviour of AO 44 A1, B1 and C1 fractures with k-wire, IS and PS fixation methods was analysed and compared in terms of displacement and stress.
Results: The lowest amount of displacement was provided with the IS method in AO 44 A1 and B1. It was observed in the detection of 4 mm k-wire in AO 44 C1. The total displacement of the IS system used for fixation in AO 44 A1, B1 and C1 fractures was lower
Conclusions: According to FEA results, the lowest amount of displacement was obtained with IS in AO 44 A1 and B1, while 4 mm K-wire fixation was achieved in AO 44 C1 fractures.
Abstract
Background: Distal fibula fractures at the ankle level are common and are usually accompanied by ligament injuries. This study aims to evaluate the effects of ankle ligament ruptures on ankle joints, fracture instability, and plate stress after distal fibula fracture fixed with plate created by finite element analysis (FEA) modeling and loading applied to ligament rupture models that may accompany this fracture.
Methods: A finite element model consisting of 3-D (3D) fibula, tibia, foot bones, and ankle ligaments was designed to investigate the effects of ligament injuries accompanying plate-detected Arbeitsgemeinschaft für Osteosynthesefragen (AO 44B2.1)-type fractures on fracture detection, fixation material, and ankle joints. Then, the results were evaluated by modeling ligament rupture in 6 different ways.
Results: In the modeling where the deltoid and the talofibular ligament are broken together, instability is the highest in the ankle (2.31 mm) and fracture line (0.15 mm). In our study, the rupture of the tibiofibular anterior and posterior ligaments associated with syndesmosis caused less instability in the fracture and ankle than the single rupture models of both the deltoid and the talofibular ligament.
Conclusions: In the finite element modeling of AO 44B2.1-type fractures detected with plate, the importance and potential effects of often overlooked ankle ligaments are pointed out shown. It is important to keep in mind that when treating ankle injuries, the ankle should be treated as a whole, with both bone and soft tissue. In some cases, the fracture may represent the visible tip of the iceberg.
Abstract
Background: This study aimed to compare two-point discrimination in feet with ankle sprains and feet without ankle problems, and to determine whether there was a change in the two-point discrimination values in ankle sprains.
Methods: A total of 108 people were included in the study. These subjects were aged between 18 and 40 years and visited the Medical Faculty of Yozgat Bozok University for various reasons in July and September of 2022. These people were divided into two groups: subjects with an ankle sprain and subjects with no ankle problems. Two-point discrimination values measured in mm were recorded for both groups using a caliper (esthesiometer) used in six regions of 216 feet. The two-point discrimination threshold values of the feet were compared statistically according to feet with ankle sprains and feet without ankle problems, as well as in right and left feet.
Results: The study determined that the two-point discrimination threshold values measured at the 1st toe tip, heel, 3rd plantar metatarsal head, medial malleolus, and lateral malleolus in subjects with an ankle sprain was higher than in subjects with no ankle problems. When comparing both feet of the subjects with an ankle sprain, the two-point discrimination threshold value in the heel of the foot with an ankle sprain was higher than in the heel of the foot without ankle problems.
Conclusions: The two-point discrimination threshold value was higher in subjects with an ankle sprain than in subjects with no ankle problems. The data suggest that the two-point discrimination threshold may be higher in people with an ankle sprain. Further studies are needed to better understand the two-point discrimination threshold in ankle sprains.
