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    CASE STUDY OF A DISTAL FEMUR TI6Al4V LOCKED COMPRESSION PLATE FAILURE SURFACE INVESTIGATION AND FINITE ELEMENT ANALYSIS
    (World Scientific Publ Co Pte Ltd, 2024) Can, Murat; Oymak, Mehmet Akif; Koluacik, Serdar; Bahce, Erkan; Uzunyol, Omer Faruk
    In this study, the failure of locking compression plates (LCP) used in the treatment of bone fractures resulting from falls in orthopedic patients at Malatya Training and Research Hospital was investigated. The researchers examined the fracture surface of the failed Ti6Al4V LCP using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) images. The fracture pattern of the plate caused by the fall was replicated in a computer-aided design (CAD) model, obtained through three-dimensional (3D) scanning. Additionally, a CAD model of the femur bone was created using magnetic resonance (MR) images. The assembled images of the replicated fracture and the femur bone were used to simulate the application of locked and unlocked compression screws. Considering the weight-bearing load on a human femur, a linear load of 1200 N and 300 N iliopsoas 300 N abductor 600 N hip contact and 70 N tensor fascia latea walking loads had been applied using finite element analysis (FEA). The researchers analyzed the total deformations, von Mises stress, and principal stresses of the plate. When FEA was conducted with walking and body forces applied, it was observed that the walking forces resulted in a 20% higher von Mises stress and a 22.5% greater total deformation 15% low cycle fatigue compared to the body force. During the analysis with walking forces applied, it was noticed that the maximum von Mises stresses on the LCP and the point where fatigue initiation began coincided with the fracture site of the LCP in the patient's body. However, this observation was in contrast to the analysis with body loads applied.
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    Experimental Investigation of Delamination Formed by Bone Drilling
    (Univ Osijek, Tech Fac, 2020) Koluacik, Serdar; Can, Murat; Bahce, Erkan
    Bone drilling is a common method for fixing implants used in bone fractures. Because of the fibre-reinforced composite structure of bone, parameters such as feed rate, spindle speed and drill type affect the hole surface quality. After drilling, the quality of the bore surface, burr formation and delamination at the hole entrance and exit affect the ability of the screw to cause implant failure and fusion problems of the fracture. For this reason, it is very important to conduct drilling with optimum speed and feedrate values. In this study, the effects of processing parameters on hole surface quality and delamination were studied experimentally. In the experiment, bovine bone, which has similar structural properties to human bone, was used. The hole surface quality and delamination formed at the exit of the hole were examined for three different feed rates and spindle speeds. As a result of the experiments, it was seen that the feed rate had more effect on both delamination and hole surface quality than the spindle speed. It was also determined that the cortical part of the bone and the cancellous part of the bone affected the production of heat and drill wear differently.
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    Investigation of thermal damage in bone drilling: Hybrid processing method and pathological evaluation of existing methods
    (Elsevier, 2022) Can, Murat; Koluacik, Serdar; Bahce, Erkan; Gokce, Hasan; Tecellioglu, Fahriye Secil
    In this study, a hybrid processing method using saline and cryogen cooler is proposed to keep the temperature below the threshold level during bone drilling. Drilling experiments were performed dry, saline, cryogen and, hybrid (saline + cryogen). At the end of the experiment, tool wear, the effect of the methods on the temperature, and the pathological evaluation of the thermal damage were investigated. The advantageous methods for bone drilling were proposed as a hybrid, saline, cryogenic and dry machining, respectively. In addition, it was observed that when cryogen was applied directly to the cutting area, it caused damage to the cell wall structure by the formation of ice crystals in the bone matrix. For this reason, it was recommended to be applied to the body of the cutting tool and it was found that cryogen flow rate has a significant effect on tool wear.