Ziya Arslan - Profile on Academia.edu (original) (raw)
Papers by Ziya Arslan
Research Square (Research Square), Apr 8, 2024
Several studies have highlighted the advantages of employing arti cial intelligence (AI) models i... more Several studies have highlighted the advantages of employing arti cial intelligence (AI) models in gait analysis. However, the practicality of AI models into clinical gait routines remains uncertain. In this study, we propose a three-step approach to evaluate the feasibility of a previously developed AI model. This model predicts joint moments during walking for 622 patients with cerebral palsy using joint kinematics as the input. Root mean square errors between labmeasured and predicted joint moments are labeled as Green (acceptable), Yellow (acceptable with caution), or Red (unacceptable). Kinematics are classi ed accordingly, and statistical analyses determine their impact on the AI model output. A linear discrimination analysis (LDA) model predicts labels for newly predicted joint moments based on kinematics. The knee moment showed the largest Green label population (73%), while the ankle moment has the smallest (34%). Gait pro le score show signi cant differences between all labels except the Green vs Red for the ankle joint. The LDA model achieves75% accuracy for knee joint moment prediction, with a Green sensitivity of 94.7%. Severer patient's condition leads to increase in Red population. While the AI model shows promise for predicting knee and hip moments, further development is necessary before its integration into clinical routines.
Patellar Tendon Advancement for the Treatment of Crouch Gait in Patients with Cerebral Palsy
Gait & Posture
Predicting Joint Moments from Kinematics in Patients with Cerebral Palsy using Deep Learning
Gait & Posture
Applied Bionics and Biomechanics
Finite element (FE) models have frequently been used to analyze spine biomechanics. Material para... more Finite element (FE) models have frequently been used to analyze spine biomechanics. Material parameters assigned to FE spine models are generally uncertain, and their effect on the characterization of the spinal components is not clear. In this study, we aimed to analyze the effect of model parameters on the range of motion, stress, and strain responses of a FE cervical spine model. To do so, we created a computed tomography-based FE model that consisted of C2-C3 vertebrae, intervertebral disc, facet joints, and ligaments. A total of 32 FE analyses were carried out for two different elastic modulus equations and four different bone layer numbers under four different loading conditions. We evaluated the effects of elastic modulus equations and layer number on the biomechanical behavior of the FE spine model by taking the range of angular motion, stress, and strain responses into account. We found that the angular motions of the one- and two-layer models had a greater variation than t...
Biomechatronics
Exoskeleton, exomusculature, and exosuit technologies have been advanced in a highly accelerated ... more Exoskeleton, exomusculature, and exosuit technologies have been advanced in a highly accelerated manner in the recent decades. In the first part of this chapter, these device concepts are appropriately defined and recent progress in this field is briefly reviewed. The second part of this chapter is focused on dynamic modeling and simulation of musculoskeletal system for exoskeleton designs.
Ankara Üniversitesi Beden Eğitimi ve Spor Yüksekokulu SPORMETRE Beden Eğitimi ve Spor Bilimleri Dergisi
The aim of this study was to develop a scale to determine the competencies of physical education ... more The aim of this study was to develop a scale to determine the competencies of physical education and sports teachers regarding the education of students with special needs and to carry out the reliability and validity studies of the developed scale. In this study, as a method, an item pool was created by taking into account the existing scale development stages in the literature, expert opinions were obtained, content validity was ensured, a trial scale was created, data were collected from the first sample group, exploratory factor analysis (EFA) was performed, and after the scale was rearranged, the second sample group was selected, data were collected and confirmatory factor analyzes (CFA) were performed. Physical education and sports teachers working in different parts of Turkey in the 2020-2021 academic year were included in the research. During the research process, two different study groups were included. Data were collected from 165 (81 women, 89 men) physical education and...
European Journal of Science and Technology, 2022
Orthopedic fixation devices have been employed in the treatment of spinal diseases. Special fixat... more Orthopedic fixation devices have been employed in the treatment of spinal diseases. Special fixation devices have been developed to decrease the effect of spinal injuries and deformities and have been used to decrease the neurologic back pain of the patients. In this study, the finite element spine model of an adolescent idiopathic scoliotic patient was constructed. The titanium spinal implant system and the system of polyetheretherketone (PEEK) were compared regarding their stress distributions. The finite element lumbar spine model from L2 to L5 vertebra was obtained from computed tomography scan data. The three-dimensional spine model consisted of four lumbar vertebrae, three intervertebral discs, six facet joints, and the corresponding ligaments. Loading and boundary conditions were applied to the L2-L5 lumbar model. According to the subjected loads and bending moments on the model, stress distributions were evaluated especially on the intervertebral discs, and the screw-rod implant systems both for the titanium and the PEEK-based fixation systems. The disc structures were also analyzed for the effects of adjacent segment disease, which has been reported as a post-operative effect of fusion surgeries. Ansys software was used for the simulation processes of the models without the implant system and the models with different fixation systems. Comparative investigation between different fixation systems showed that the stress distribution values were decreased with the PEEK-based fixation system. Moreover, lower total deformation and equivalent stress values were recorded with the PEEK-based fixation system, especially on L3-L4 and L4-L5 intervertebral discs. Furthermore, both spinal implant systems allowed to decrease the overall loading stress on the whole spine models. And it was concluded that the PEEK-based spinal implant system was considerably reduced the load on the discs and ligaments, and also appeared as a better option in stress reduction and load sharing when compared to the titanium spinal implant system.
Research Article Comparison of the Data Classification Approaches to Diagnose Spinal Cord Injury
Copyright © 2012 Yunus Ziya Arslan et al. This is an open access article distributed under the Cr... more Copyright © 2012 Yunus Ziya Arslan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In our previous study, we have demonstrated that analyzing the skin impedances measured along the key points of the dermatomes might be a useful supplementary technique to enhance the diagnosis of spinal cord injury (SCI), especially for unconscious and noncooperative patients. Initially, in order to distinguish between the skin impedances of control group and patients, artificial neural networks (ANNs) were used as the main data classification approach. However, in the present study, we have proposed two more data classification approaches, that is, support vector machine (SVM) and hierarchical cluster tree analysis (HCTA), which improved the classification rate and also the overall performance. A comparison of the performance of...
3D Printing in Biomedical Engineering, 2020
Biomanufacturing, 2019
Maxillofacial deformities and undesirable position of the mandible cause facial asymmetry and mal... more Maxillofacial deformities and undesirable position of the mandible cause facial asymmetry and malocclusions. The techniques and equipment used for the maxillofacial surgeries have changed over the years. In this chapter, traditional preoperative preparations and surgical planning process in the orthognathic surgery have been summarized. In addition, we reviewed various software and workflows used for the preoperative planning and design of the miniplates. We also presented a systematic protocol for the subject-specific miniplate design as a case study. In this case, design steps, which are required to be taken for obtaining the virtual model of the patient head composed of the skull, mandible, and teeth were elucidated. Simulation of the Le Fort I osteotomy, which is considered as a safe and functional procedure to correct maxillary deformities, benefiting from a computer-aided design software to plan the actual surgery process was also carried out. It is expected that the presented virtual planning process would improve the accuracy of orthognathic surgery and patient satisfaction, and reduce the operation time and cost.
Human hand prosthetics imply a great challenge to researchers to help regaining the lost motor fu... more Human hand prosthetics imply a great challenge to researchers to help regaining the lost motor functions for amputated people. A relatively high amount of labor and budget are required to reach the ordinary prosthetics for amputees. Improvement of assistive technologies has provided to design and manufacture more functional hand prosthetics. Novel tools employed in assistive technology including 3-dimensional printers and user-friendly electronics complementary devices have made a great contribution to prosthetics area with fast and cost effective solutions. Although a significant development of technical facilities has been occurred, prosthetic hands with high functionality could not gain wide currency since the manufacturing and design processes require more educated engineers and biomechanicsts. Introducing the design and manufacturing steps of prosthetics for educational purposes in engineering and life sciences could be very effective in order to ease accessing the more functio...
A musculoskeletal spine model for predicting spinal muscle forces of a human body exposed to whole-body vibration
Design of Patient-Specific Maxillofacial Implants and Guides
Sinif Öğretmenleri̇ni̇n Beden Eği̇ti̇mi̇ Ders Programi Ve Ders Uygulamalarina İli̇şki̇n Görüşleri̇
Bu calismanin amaci, sinif ogretmenlerinin, beden egitimi ders programi ve ders uygulamalarina il... more Bu calismanin amaci, sinif ogretmenlerinin, beden egitimi ders programi ve ders uygulamalarina iliskin goruslerini saptamak ve bu gorusler arasinda cinsiyete, hizmet yilina ve mezun olduklari bolume gore anlamli bir fark olup olmadigini tespit etmektir. Calismaya Denizli ili merkez ilcedeki ilkogretim okullarinda gorev yapan 425 sinif ogretmeni katilmistir. Calismada veri toplama araci olarak, calisma oncesi Turkce’ye uyarlanan “Okul Saglik Indeksi-Beden Egitimi Olcegi” ve “Kisisel Bilgi Formu” kullanilmistir. Yapilan guvenirlik calismasinda, olcege iliskin Cronbach Alfa guvenirlik katsayisi 0.82 olarak bulunmustur. Veriler tanimlayici istatistik (frekans- yuzde), T-testi, Tek Yonlu Varyans Analizi ve Tukey testi kullanilarak cozumlenmistir. Elde edilen olcek puanlarindan hareketle, kadin ( X = 20.6 ±4.9) ve erkek ( X = 20.0 ±5.0) sinif ogretmenlerinin, beden egitimi ders programina yonelik uygulamalarina iliskin goruslerinin olumsuz oldugu soylenebilir. Olcek puanlarinda, hizmet yi...
Computer-assisted Design of Patient-specific Sagittal Split Osteotomy Guide and Soft Tissue Retractor
Journal of Medical and Biological Engineering, 2014
Sagittal split osteotomy (SSO) is a maxillofacial surgery procedure that is used to correct mandi... more Sagittal split osteotomy (SSO) is a maxillofacial surgery procedure that is used to correct mandibular prognathism, retrusion, or asymmetry. During an SSO, the use of sharp rotary tools for the osteotomy can induce complications, especially during the osteotomy of the medial side of the mandibular ramus. In this study, to decrease SSO complications, a computer-assisted, patient-specific sagittal split osteotomy guide and soft tissue retractor is developed. Computed tomography (CT) images of a human cadaveric mandible were digitally converted into a three-dimensional (3D) model. Then, a case-specific 3D model of the proposed device was designed for the surface of a cadaveric mandible, with the osteotomy line and geometric dimensions of the mandible both taken into consideration. The created 3D model was used to manufacture the device using the metal laser sintering method. Finally, an SSO with the device was performed on the cadaveric mandible used to acquire the CT data. The propose...
Estimation of Forces Applied to Forearm Using EMG Signal Features to Control of Powered Human Arm Prostheses
World Academy of Science, Engineering and Technology, International Journal of Biomedical and Biological Engineering, 2015
Encyclopedia of Information Science and Technology, Fourth Edition, 2018
Life, 2021
Background: Patellar tendon advancement (PTA) is performed for the treatment of crouch gait in pa... more Background: Patellar tendon advancement (PTA) is performed for the treatment of crouch gait in patients with cerebral palsy (CP). In this study, we aimed to determine the influence of PTA in the context of single-event multilevel surgery (SEMLS) on knee joint moment and muscle forces through musculoskeletal modeling; Methods: Gait data of children with CP and crouch gait were retrospectively analyzed. Patients were included if they had a SEMLS with a PTA (PTA group, n = 18) and a SEMLS without a PTA (NoPTA group, n = 18). A musculoskeletal model was used to calculate the pre- and postoperative knee joint moments and muscle forces; Results: Knee extensor moment increased in the PTA group postoperatively (p = 0.016), but there was no statistically significant change in the NoPTA group (p > 0.05). The quadriceps muscle forces increased for the PTA group (p = 0.034), while there was no difference in the NoPTA group (p > 0.05). The hamstring muscle forces increased in the PTA group...
Acta Ortopédica Brasileira, 2018
Objective: To assess the histopathologic and biomechanical effects of hyaluronic acid (HA) and hi... more Objective: To assess the histopathologic and biomechanical effects of hyaluronic acid (HA) and high-dose vitamin C (VC) on rat Achilles tendon healing. Methods: Forty-eight Sprague-Dawley rats were randomized to HA and VC and control groups with equal numbers. Each group was further divided into two subgroups to be sacrificed on Day 15 (n=8) and Day 30 (n=8). The Achilles tendons were cut and repaired. While the control rats remained untreated, HA and VC were administered after repair. The repaired tendons were removed for biomechanical and histopathologic analyses. In the biomechanical tests, the tendons were stretched to failure and maximum forces were measured. For histopathologic examination, the specimens were interpreted semiquantitatively using Movin’s grading scale and Bonar scores. Results: The highest mean forces were obtained in the HA group on Day 15 and in the VC group on Day 30, with a significant difference between HA and VC on Day 15 between control and VC on Day 30 ...
Acta Ortopédica Brasileira, 2020
Objective: We aimed to investigate the change in bone mineral density (BMD) in the first postoper... more Objective: We aimed to investigate the change in bone mineral density (BMD) in the first postoperative year in patients that underwent total knee arthroplasty (TKA) due to primary osteoarthritis of the knee. Methods: Preoperative and first postoperative year dual-energy X-ray absorptiometry measurements of 76 patients with knee osteoarthritis, who undergone surgery between 2016 and 2018 due to the recommendation for TKA, were statistically evaluated in the study. Results: Of the 19 patients with a normal BMD in the preoperative period, 73.7% (n = 14) continued to have a normal BMD in the postoperative period. Of the 34 patients with a low BMD (osteopenia) in the preoperative period, 91.2% (n = 31) did not show any change, whereas osteoporosis was observed in two patients (5.9%) in the postoperative period. Of the 23 patients with osteoporosis in the preoperative period, 95.7% (n = 22) did not show any change, whereas osteopenia was observed in one patient (4.3%) in the postoperative...
Research Square (Research Square), Apr 8, 2024
Several studies have highlighted the advantages of employing arti cial intelligence (AI) models i... more Several studies have highlighted the advantages of employing arti cial intelligence (AI) models in gait analysis. However, the practicality of AI models into clinical gait routines remains uncertain. In this study, we propose a three-step approach to evaluate the feasibility of a previously developed AI model. This model predicts joint moments during walking for 622 patients with cerebral palsy using joint kinematics as the input. Root mean square errors between labmeasured and predicted joint moments are labeled as Green (acceptable), Yellow (acceptable with caution), or Red (unacceptable). Kinematics are classi ed accordingly, and statistical analyses determine their impact on the AI model output. A linear discrimination analysis (LDA) model predicts labels for newly predicted joint moments based on kinematics. The knee moment showed the largest Green label population (73%), while the ankle moment has the smallest (34%). Gait pro le score show signi cant differences between all labels except the Green vs Red for the ankle joint. The LDA model achieves75% accuracy for knee joint moment prediction, with a Green sensitivity of 94.7%. Severer patient's condition leads to increase in Red population. While the AI model shows promise for predicting knee and hip moments, further development is necessary before its integration into clinical routines.
Patellar Tendon Advancement for the Treatment of Crouch Gait in Patients with Cerebral Palsy
Gait & Posture
Predicting Joint Moments from Kinematics in Patients with Cerebral Palsy using Deep Learning
Gait & Posture
Applied Bionics and Biomechanics
Finite element (FE) models have frequently been used to analyze spine biomechanics. Material para... more Finite element (FE) models have frequently been used to analyze spine biomechanics. Material parameters assigned to FE spine models are generally uncertain, and their effect on the characterization of the spinal components is not clear. In this study, we aimed to analyze the effect of model parameters on the range of motion, stress, and strain responses of a FE cervical spine model. To do so, we created a computed tomography-based FE model that consisted of C2-C3 vertebrae, intervertebral disc, facet joints, and ligaments. A total of 32 FE analyses were carried out for two different elastic modulus equations and four different bone layer numbers under four different loading conditions. We evaluated the effects of elastic modulus equations and layer number on the biomechanical behavior of the FE spine model by taking the range of angular motion, stress, and strain responses into account. We found that the angular motions of the one- and two-layer models had a greater variation than t...
Biomechatronics
Exoskeleton, exomusculature, and exosuit technologies have been advanced in a highly accelerated ... more Exoskeleton, exomusculature, and exosuit technologies have been advanced in a highly accelerated manner in the recent decades. In the first part of this chapter, these device concepts are appropriately defined and recent progress in this field is briefly reviewed. The second part of this chapter is focused on dynamic modeling and simulation of musculoskeletal system for exoskeleton designs.
Ankara Üniversitesi Beden Eğitimi ve Spor Yüksekokulu SPORMETRE Beden Eğitimi ve Spor Bilimleri Dergisi
The aim of this study was to develop a scale to determine the competencies of physical education ... more The aim of this study was to develop a scale to determine the competencies of physical education and sports teachers regarding the education of students with special needs and to carry out the reliability and validity studies of the developed scale. In this study, as a method, an item pool was created by taking into account the existing scale development stages in the literature, expert opinions were obtained, content validity was ensured, a trial scale was created, data were collected from the first sample group, exploratory factor analysis (EFA) was performed, and after the scale was rearranged, the second sample group was selected, data were collected and confirmatory factor analyzes (CFA) were performed. Physical education and sports teachers working in different parts of Turkey in the 2020-2021 academic year were included in the research. During the research process, two different study groups were included. Data were collected from 165 (81 women, 89 men) physical education and...
European Journal of Science and Technology, 2022
Orthopedic fixation devices have been employed in the treatment of spinal diseases. Special fixat... more Orthopedic fixation devices have been employed in the treatment of spinal diseases. Special fixation devices have been developed to decrease the effect of spinal injuries and deformities and have been used to decrease the neurologic back pain of the patients. In this study, the finite element spine model of an adolescent idiopathic scoliotic patient was constructed. The titanium spinal implant system and the system of polyetheretherketone (PEEK) were compared regarding their stress distributions. The finite element lumbar spine model from L2 to L5 vertebra was obtained from computed tomography scan data. The three-dimensional spine model consisted of four lumbar vertebrae, three intervertebral discs, six facet joints, and the corresponding ligaments. Loading and boundary conditions were applied to the L2-L5 lumbar model. According to the subjected loads and bending moments on the model, stress distributions were evaluated especially on the intervertebral discs, and the screw-rod implant systems both for the titanium and the PEEK-based fixation systems. The disc structures were also analyzed for the effects of adjacent segment disease, which has been reported as a post-operative effect of fusion surgeries. Ansys software was used for the simulation processes of the models without the implant system and the models with different fixation systems. Comparative investigation between different fixation systems showed that the stress distribution values were decreased with the PEEK-based fixation system. Moreover, lower total deformation and equivalent stress values were recorded with the PEEK-based fixation system, especially on L3-L4 and L4-L5 intervertebral discs. Furthermore, both spinal implant systems allowed to decrease the overall loading stress on the whole spine models. And it was concluded that the PEEK-based spinal implant system was considerably reduced the load on the discs and ligaments, and also appeared as a better option in stress reduction and load sharing when compared to the titanium spinal implant system.
Research Article Comparison of the Data Classification Approaches to Diagnose Spinal Cord Injury
Copyright © 2012 Yunus Ziya Arslan et al. This is an open access article distributed under the Cr... more Copyright © 2012 Yunus Ziya Arslan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In our previous study, we have demonstrated that analyzing the skin impedances measured along the key points of the dermatomes might be a useful supplementary technique to enhance the diagnosis of spinal cord injury (SCI), especially for unconscious and noncooperative patients. Initially, in order to distinguish between the skin impedances of control group and patients, artificial neural networks (ANNs) were used as the main data classification approach. However, in the present study, we have proposed two more data classification approaches, that is, support vector machine (SVM) and hierarchical cluster tree analysis (HCTA), which improved the classification rate and also the overall performance. A comparison of the performance of...
3D Printing in Biomedical Engineering, 2020
Biomanufacturing, 2019
Maxillofacial deformities and undesirable position of the mandible cause facial asymmetry and mal... more Maxillofacial deformities and undesirable position of the mandible cause facial asymmetry and malocclusions. The techniques and equipment used for the maxillofacial surgeries have changed over the years. In this chapter, traditional preoperative preparations and surgical planning process in the orthognathic surgery have been summarized. In addition, we reviewed various software and workflows used for the preoperative planning and design of the miniplates. We also presented a systematic protocol for the subject-specific miniplate design as a case study. In this case, design steps, which are required to be taken for obtaining the virtual model of the patient head composed of the skull, mandible, and teeth were elucidated. Simulation of the Le Fort I osteotomy, which is considered as a safe and functional procedure to correct maxillary deformities, benefiting from a computer-aided design software to plan the actual surgery process was also carried out. It is expected that the presented virtual planning process would improve the accuracy of orthognathic surgery and patient satisfaction, and reduce the operation time and cost.
Human hand prosthetics imply a great challenge to researchers to help regaining the lost motor fu... more Human hand prosthetics imply a great challenge to researchers to help regaining the lost motor functions for amputated people. A relatively high amount of labor and budget are required to reach the ordinary prosthetics for amputees. Improvement of assistive technologies has provided to design and manufacture more functional hand prosthetics. Novel tools employed in assistive technology including 3-dimensional printers and user-friendly electronics complementary devices have made a great contribution to prosthetics area with fast and cost effective solutions. Although a significant development of technical facilities has been occurred, prosthetic hands with high functionality could not gain wide currency since the manufacturing and design processes require more educated engineers and biomechanicsts. Introducing the design and manufacturing steps of prosthetics for educational purposes in engineering and life sciences could be very effective in order to ease accessing the more functio...
A musculoskeletal spine model for predicting spinal muscle forces of a human body exposed to whole-body vibration
Design of Patient-Specific Maxillofacial Implants and Guides
Sinif Öğretmenleri̇ni̇n Beden Eği̇ti̇mi̇ Ders Programi Ve Ders Uygulamalarina İli̇şki̇n Görüşleri̇
Bu calismanin amaci, sinif ogretmenlerinin, beden egitimi ders programi ve ders uygulamalarina il... more Bu calismanin amaci, sinif ogretmenlerinin, beden egitimi ders programi ve ders uygulamalarina iliskin goruslerini saptamak ve bu gorusler arasinda cinsiyete, hizmet yilina ve mezun olduklari bolume gore anlamli bir fark olup olmadigini tespit etmektir. Calismaya Denizli ili merkez ilcedeki ilkogretim okullarinda gorev yapan 425 sinif ogretmeni katilmistir. Calismada veri toplama araci olarak, calisma oncesi Turkce’ye uyarlanan “Okul Saglik Indeksi-Beden Egitimi Olcegi” ve “Kisisel Bilgi Formu” kullanilmistir. Yapilan guvenirlik calismasinda, olcege iliskin Cronbach Alfa guvenirlik katsayisi 0.82 olarak bulunmustur. Veriler tanimlayici istatistik (frekans- yuzde), T-testi, Tek Yonlu Varyans Analizi ve Tukey testi kullanilarak cozumlenmistir. Elde edilen olcek puanlarindan hareketle, kadin ( X = 20.6 ±4.9) ve erkek ( X = 20.0 ±5.0) sinif ogretmenlerinin, beden egitimi ders programina yonelik uygulamalarina iliskin goruslerinin olumsuz oldugu soylenebilir. Olcek puanlarinda, hizmet yi...
Computer-assisted Design of Patient-specific Sagittal Split Osteotomy Guide and Soft Tissue Retractor
Journal of Medical and Biological Engineering, 2014
Sagittal split osteotomy (SSO) is a maxillofacial surgery procedure that is used to correct mandi... more Sagittal split osteotomy (SSO) is a maxillofacial surgery procedure that is used to correct mandibular prognathism, retrusion, or asymmetry. During an SSO, the use of sharp rotary tools for the osteotomy can induce complications, especially during the osteotomy of the medial side of the mandibular ramus. In this study, to decrease SSO complications, a computer-assisted, patient-specific sagittal split osteotomy guide and soft tissue retractor is developed. Computed tomography (CT) images of a human cadaveric mandible were digitally converted into a three-dimensional (3D) model. Then, a case-specific 3D model of the proposed device was designed for the surface of a cadaveric mandible, with the osteotomy line and geometric dimensions of the mandible both taken into consideration. The created 3D model was used to manufacture the device using the metal laser sintering method. Finally, an SSO with the device was performed on the cadaveric mandible used to acquire the CT data. The propose...
Estimation of Forces Applied to Forearm Using EMG Signal Features to Control of Powered Human Arm Prostheses
World Academy of Science, Engineering and Technology, International Journal of Biomedical and Biological Engineering, 2015
Encyclopedia of Information Science and Technology, Fourth Edition, 2018
Life, 2021
Background: Patellar tendon advancement (PTA) is performed for the treatment of crouch gait in pa... more Background: Patellar tendon advancement (PTA) is performed for the treatment of crouch gait in patients with cerebral palsy (CP). In this study, we aimed to determine the influence of PTA in the context of single-event multilevel surgery (SEMLS) on knee joint moment and muscle forces through musculoskeletal modeling; Methods: Gait data of children with CP and crouch gait were retrospectively analyzed. Patients were included if they had a SEMLS with a PTA (PTA group, n = 18) and a SEMLS without a PTA (NoPTA group, n = 18). A musculoskeletal model was used to calculate the pre- and postoperative knee joint moments and muscle forces; Results: Knee extensor moment increased in the PTA group postoperatively (p = 0.016), but there was no statistically significant change in the NoPTA group (p > 0.05). The quadriceps muscle forces increased for the PTA group (p = 0.034), while there was no difference in the NoPTA group (p > 0.05). The hamstring muscle forces increased in the PTA group...
Acta Ortopédica Brasileira, 2018
Objective: To assess the histopathologic and biomechanical effects of hyaluronic acid (HA) and hi... more Objective: To assess the histopathologic and biomechanical effects of hyaluronic acid (HA) and high-dose vitamin C (VC) on rat Achilles tendon healing. Methods: Forty-eight Sprague-Dawley rats were randomized to HA and VC and control groups with equal numbers. Each group was further divided into two subgroups to be sacrificed on Day 15 (n=8) and Day 30 (n=8). The Achilles tendons were cut and repaired. While the control rats remained untreated, HA and VC were administered after repair. The repaired tendons were removed for biomechanical and histopathologic analyses. In the biomechanical tests, the tendons were stretched to failure and maximum forces were measured. For histopathologic examination, the specimens were interpreted semiquantitatively using Movin’s grading scale and Bonar scores. Results: The highest mean forces were obtained in the HA group on Day 15 and in the VC group on Day 30, with a significant difference between HA and VC on Day 15 between control and VC on Day 30 ...
Acta Ortopédica Brasileira, 2020
Objective: We aimed to investigate the change in bone mineral density (BMD) in the first postoper... more Objective: We aimed to investigate the change in bone mineral density (BMD) in the first postoperative year in patients that underwent total knee arthroplasty (TKA) due to primary osteoarthritis of the knee. Methods: Preoperative and first postoperative year dual-energy X-ray absorptiometry measurements of 76 patients with knee osteoarthritis, who undergone surgery between 2016 and 2018 due to the recommendation for TKA, were statistically evaluated in the study. Results: Of the 19 patients with a normal BMD in the preoperative period, 73.7% (n = 14) continued to have a normal BMD in the postoperative period. Of the 34 patients with a low BMD (osteopenia) in the preoperative period, 91.2% (n = 31) did not show any change, whereas osteoporosis was observed in two patients (5.9%) in the postoperative period. Of the 23 patients with osteoporosis in the preoperative period, 95.7% (n = 22) did not show any change, whereas osteopenia was observed in one patient (4.3%) in the postoperative...