Yazar "Nacefov, Turan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Yayın
    The effects of proximal fibular osteotomy on the knee and ankle joints: a finite element analysis
    (Czech Society for Orthopaedics and Traumatology, Slovak Society for Orthopaedics and Traumatology and Publishing House Galen, 2021) Ünal, Ömer Kays; Dağtaş, Mirza Zafer; Demir, C.; Nacefov, Turan; Üğütmen, Ender
    PURPOSE OF THE STUDY In this study, our aim is to examine the effect of proximal fibular osteotomy on knee and ankle kinematics with finite element analysis method. MATERIAL AND METHODS One 62-year-old, female volunteer’s radiologic images were used for creating lower limb model. Osteotomized model (OM) which was created according to definition of PFO and non-osteotomized model (NOM) were created. To obtain a stress distribution comparison between the two models, 350 N of axial force was applied to the femoral heads of the models. RESULTS After PFO, the average contact pressure decreased 26.1% at the medial tibial cartilage and increased 42.4% at the lateral tibial cartilage. The Von Mises stresses decreased 57.1% at the femoral cartilage and decreased 79.1% at tibial cartilage. The stress on the tibial cartilage increased 44.6%, and stress on the talar cartilage increased 7.1% at the ankle joint. CONCLUSIONS FEA revealed that main loading at the knee joint shifted from medial tibial cartilage to the lateral tibial cartilage after PFO. Additionally, the stresses on each cartilage were redistributed across a wider and more peripheral area. FEA also demonstrated that the Von Mises stresses of the tibial and talar cartilages of the ankle joint increased after PFO.
  • Küçük Resim Yok
    Yayın
    Novel lateral support system increases stability and reduces angular error in total hip arthroplasty: A case control study
    (SelSistem, 2022) Dağtaş, Mirza Zafer; Ünal, Ömer Kays; Nacefov, Turan; Üğütmen, Ender
    Background/Aim: Intraoperative changes in patient position or other changes that would disrupt the decisive position during preoperative preparation would directly have a negative impact on acetabular cup orientation in patients undergoing total hip arthroplasty. This study aimed to compare the standard support system and a novel lateral support system (Maltepe), which ensures stable lateral decubitus positioning during the perioperative period, in patients undergoing total hip arthroplasty with the posterolateral approach. Methods: Patients operated in our department for osteoarthritis of the hip between 2012 - 2019 were included in this case-control study retrospectively. 46 and 41 patients were prepared for surgery in lateral decubitus position using the classical (Group 1) and novel (Group 2) lateral support systems, respectively. The groups were compared in terms of demographic characteristics, duration of preparation, anteversion and inclination, and Harris Hip scores. Results: Mean patient age was 66.89 (7.53). There was no significant difference between the two groups in terms of age (P=0.546), gender (P=1.00), body mass index (P=0.302) and the operative side (P=0.724). Duration of preparation and absolute deviation values from 15 degrees and 45 degrees were significantly better in group 2 compared to group 1 (P<0.01). There was no significant difference between the Harris Hip Scores of two groups. Conclusion: We demonstrated that the novel support system we developed provided more successful outcomes than the classical system in terms of acetabular cup orientation.