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Öğe 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 FarukIn 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.Öğe Experimental Investigation of Delamination Formed by Bone Drilling(Univ Osijek, Tech Fac, 2020) Koluacik, Serdar; Can, Murat; Bahce, ErkanBone 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.Öğe 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 SecilIn 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.Öğe Monoplanar versus biplanar medial open-wedge proximal tibial osteotomy for varus gonarthrosis: a comparison of clinical and radiological outcomes(Springer, 2013) Elmali, Nurzat; Esenkaya, Irfan; Can, Murat; Karakaplan, MustafaWe compared clinical and radiological results of two proximal tibial osteotomy (PTO) techniques: monoplanar medial open-wedge osteotomy and biplanar retrotubercle medial open-wedge osteotomy, stabilised by a wedged plate. We evaluated 88 knees in 78 patients. Monoplanar medial open-wedge PTO was performed on 56 knees in 50 patients with a mean age of 55 +/- A 9 years. Biplanar retrotubercle medial open-wedge PTO was performed on 32 knees in 28 patients with a mean age of 57 +/- A 7 years. Mean follow-up periods were 40.6 +/- A 7 months for the monoplanar PTO group and 38 +/- A 5 months for the biplanar retrotubercle PTO group. Clinical outcome was evaluated using the hospital for special surgery scoring system, and radiological outcome was evaluated by the measurements of femorotibial angle (FTA), patellar height and tibial slope changes. In both groups, post-operative HSS scores increased significantly. No significant difference was found between groups in FTA alteration, but the FTA decreased significantly in both groups. Patellar index ratios decreased significantly in the monoplanar PTO group (Insall-Salvati Index by 0.07, Blackburne-Peel Index by 0.07), but not in the biplanar retrotubercle PTO group. Tibial slopes were increased significantly in the monoplanar PTO group, but not in the retrotubercle PTO group. Biplanar retrotubercle medial open-wedge osteotomy and monoplanar medial open-wedge osteotomy are both clinically effective for the treatment for varus gonarthrosis. Retrotubercle osteotomy also prevents patella infera and tibial slope changes radiologically. Therapeutic study, prospective comparative study, Level II.Öğe Varus gonartrozlu dizlerde medial açık kama osteotomisi ve retrotüberkül osteotomisi tekniklerinin kısa-orta dönem sonuçlarının klinik ve radyolojik olarak değerlendirilmesi(İnönü Üniversitesi, 2007) Can, MuratKlinigimizde diz medial kompartman osteoartriti nedeni ile yüksek tibial osteotomi uygulanmıs olan hastalarda, medial açık kama osteotomisi (MAKO) ve retrotüberkül osteotomisi (RTO) tekniklerini radyolojik ve klinik sonuçlar yönünden degerlendirmek istedik Hastalar ve Yöntem: Yüksek tibial osteotomi uygulanan 97 dizin 43 tanesi çalısmaya alındı. 43 dizin 27 `sine medial açık kama osteotomisi (ortalama yas 55) ve 16' sınada retrotüberkül osteotomisi (ortalama yas 57) uygulandı. Ortalama takip süresi MAKO grubunda 40,6 ay (9 - 68 ay), RTO grubunda ise 14 aydı (7 - 27 ay). Radyolojik olarak femorotibial açı, kalça - diz - ayakbilegi açısı, femoral kondil - tibial plato açısı, femoral kondil - femoral saft açısı, tibial plato - tibial saft açısı, tibial egim açıları (anterior tibial korteks, tibial anatomik aks, posterior tibial korteks referans çizgilerine göre) ve patellar indeks oranları (Insall - Salvati, Blackburne - Peel, Caton indeks) ölçüldü. Osteoartritin derecesi artroskopik olarak Outerbridge yöntemi, radyolojik olarak da Ahlback yöntemi ile degerlendirildi. Klinik degerlendirme HSS (Hospital for Special Surgery) ve SF-36 (Short Form-36) skorlama sistemleri kullanılarak yapıldı. Bulgular: MAKO grubunda patellar indeks oranlarında belirgin derecede azalma mevcutken, RTO grubunda istatistiksel olarak anlamlı bir degisim izlenmedi. Tibial egim incelendiginde MAKO grubunda istatistiksel olarak anlamlı bir artıs mevcutken, RTO grubunda degisim görülmedi. Femorotibial açı degerlerindeki degisim için her iki gruptaki sonuçlar arasında anlamlı farklılık yoktu. HSS ve SF-36 skorlarındaki artıslar her iki grup içinde anlamlıydı. BMI ve yas parametrelerinin korreksiyon kaybında etkili olabilecegini gördük. Sonuç: Retrotüberkül osteotomi tekniginin patellofemoral sorunları olan ve ileri derecede düzeltme gereken olgularda tercih edilebilecek bir yöntem oldugunu düsünmekteyiz.
